Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Using ETABS (Metric SI Units)
ACECOMS, AIT Tel, Fax: +662-524-5539 Email:
[email protected] Website: http://acecoms.ait.asia/
Table of Content Objective
3
Problem
3
Step by Step
10
1. Start Model with Template
10
2. Define Material Properties
15
3. Define Member Sections
18
4. Draw the Members and Assign Supports
23
5. Assign Floor Diaphragm
39
6. Define and Assign Loads
41
7. Define Mass Source
55
8. Define Property /Stiffness Modifier and Rigid Zone Factor
56
9. Define Load Combinations
59
10. Define P-Delta Options
65
11. Run Analysis
66
12. View the Analysis Results and Modify Response Spectrum
69
13. Run Concrete Frame Design and View the Design Results
84
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
Objective To demonstrate and practice step-by-step on the modeling, analysis, and design of 5 story RC building by static and dynamic lateral force procedure.
Problem Carry out analysis, and design of 5 story RC building as shown in following details using NSCP 2015 lateral force procedure.
3D View
ACECOMS, AIT
3/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Plan View (Unit in mm)
Plane View: Foundation
Plan View: STORY 2 ACECOMS, AIT
4/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
Plan View: STORY 3
Plan View: STORY 4
ACECOMS, AIT
5/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
Plan View: STORY 5
ACECOMS, AIT
6/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Material Properties for Concrete Concrete Compressive Strength (fc’)
= 28
MPa
Modulus of Elasticity (E)
= 24,870.06
MPa
Minimum Yield Strength (fy) for main rebar
= 420
MPa
Minimum Yield Strength (fy) for shear rebar
= 280
MPa
Material Properties for Reinforcement
Section Properties Member
Dimension
Girders – G1 (depth x width)
700 x 300 mm
Beams – B1 (depth x width)
500 x 250 mm
Column – C1 (depth x width)
500 x 500 mm
One-Way Slab
Thickness = 100 mm
Two-Way Slab
Thickness = 100 mm
Foundation (depth x width x thickness)
3,000 x 3,000 x 400 mm
Story Height Data Story
Height
Ground Level to Level 2
4.00 m
Typical Levels (Level 2 to Level 5)
3.20 m
Static Load Cases Load Name DEAD
SDL
Live
ACECOMS, AIT
Load Type
Details
Value
Dead Load
Self Weight of Structural Members Calculate automatically using Self Weight Multiplier in ETABS
-
Applied to all levels
1.20 kPa
CHB Masonry Load, applied to perimeter beams only
6.60 kN/m
Applied to Level 2 to Level 4
2.40 kPa
Applied to Level 5
1.90 kPa
Superimposed Dead Load
Live Load
7/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Wind Load Cases (NSCP-2015) Parameter
Value
References
250 kph
NSCP 2015
Occupancy Category
IV
Standard Occupancy
Roughness Category
D
NSCP 2015
Exposure Category
D
NSCP 2015
Wind Directionality Factor, Kd
0.85
NSCP 2015
Topographic Factor, Kzt
1.00
NSCP 2015
Gust Factor, G
0.85
NSCP 2015
207B – All heights
NSCP 2015
1.0
Standard Occupancy
Design Wind Speed, V
Method Importance Factor, I
Seismic Load Cases (NSCP-2015) Parameter
Value
References
0.4
NSCP 2015
A
West Valley Fault
SD
NSCP 2015
10.0 km
-
Seismic Importance Factor, I
1.0
Standard Occupancy Structure
Acceleration-dependent near-source factor, Na
1.0
NSCP Table 208-5 (Interpolated)
Velocity-dependent near-source factor, Nv
1.2
NSCP Table 208-6 (Interpolated)
Acceleration-dependent seismic coefficient, Ca
0.440
NSCP Table 208-7
Velocity-dependent seismic coefficient, Cv
0.768
NSCP Table 208-8
8.5
Special RC Moment Frames
Seismic Zone Factor, Z Seismic Source Type Soil Site Class Distance to nearest known active fault
Response Modification Factor, R
ACECOMS, AIT
8/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Basic Load Cases
Dead
Self-weight Factor 1.0
SDEAD
Dead
0.0
Live Load
LIVE
Live
0.0
Static Earthquake (+X-Direction)
STX+
Quake
0.0
Static Earthquake (-X-Direction)
STX-
Quake
0.0
Static Earthquake (+Y-Direction)
STY+
Quake
0.0
Static Earthquake (-Y-Direction)
STY-
Quake
0.0
Dynamic Earthquake (X-Direction)
RSPX
Quake
0.0
Dynamic Earthquake (Y-Direction)
RSPY
Quake
0.0
Load Case Description Dead Load Superimposed Dead Load
Model Designation DEAD
Load Type
Note: Static Earthquake (Equivalent) will be defined only one case in this example and use to scale the dynamic earthquake (Response spectrum). Load combinations LC Name
LF
SERV1
1.00
SERV2 SERV3 SERV4 SERV5
1.16 1.16 0.84 0.84
ULG1 ULG2
1.40 1.20
ULD1 ULD2 ULD3 ULD4 ULD5 ULD6 ULD7 ULD8
1.42 1.42 0.98 0.98 1.12 1.12 0.68 0.68
TYPE
LF
TYPE LF TYPE LF TYPE Service Gravity Combinations DEAD 1.00 SDEAD 1.00 LIVE Service Dynamic Earthquake Combinations DEAD 1.16 SDEAD 1.00 LIVE 0.71 RSPX DEAD 1.16 SDEAD 1.00 LIVE 0.21 RSPX DEAD 0.84 SDEAD 1.00 LIVE 0.71 RSPX DEAD 0.84 SDEAD 1.00 LIVE 0.21 RSPX Ultimate Gravity Combinations DEAD 1.40 SDEAD DEAD 1.20 SDEAD 1.60 LIVE Ultimate Dynamic Earthquake Combinations DEAD 1.42 SDEAD 0.50 LIVE 1.00 RSPX DEAD 1.42 SDEAD 0.50 LIVE 0.30 RSPX DEAD 0.98 SDEAD 0.50 LIVE 1.00 RSPX DEAD 0.98 SDEAD 0.50 LIVE 0.30 RSPX DEAD 1.12 SDEAD 1.00 RSPX 0.30 RSPY DEAD 1.12 SDEAD 0.30 RSPX 1.00 RSPY DEAD 0.68 SDEAD 1.00 RSPX 0.30 RSPY DEAD 0.68 SDEAD 0.30 RSPX 1.00 RSPY
LF
TYPE
0.21 0.71 0.21 0.71
RSPY RSPY RSPY RSPY
0.30 1.00 0.30 1.00
RSPY RSPY RSPY RSPY
Note: these load combinations are for demonstration only. The load combinations with wind load are required for real project
ACECOMS, AIT
9/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
Step by Step 1. Start Model with Template Step 1-1: Create New Model using Grid Line. Start the program ETABS, go to New Model or , then select Use Built-in Setting With and choose Metric SI. Specify grid dimension and story dimension as shown in figure below.
ACECOMS, AIT
10/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Go to Custom Grid Spacing, then select Edit Grid Data.
Select Display Grid Data as Spacing and specify grid X and Y dimension as shown in figure below. Then click OK.
ACECOMS, AIT
11/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Go to Custom Story Data, then select Edit Story Data.
Adjust story name and story height as shown in figure below. Then click OK.
ACECOMS, AIT
12/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Select Grid Only and click OK again to generate grid line system.
ACECOMS, AIT
13/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 1-2: Save the Model The grid system has been created as parameters specified from previous steps. Go to File >> Save As…, or and choose any file location as shown in figure below.
ACECOMS, AIT
14/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
2. Define Material Properties Step 2-1: Define the material properties of concrete Go to Define >> Material Properties… and click on “Add New Material”. Enter the name “fc’28 MPa” and select the properties of concrete as shown in the figure below. Then press OK.
ACECOMS, AIT
15/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 2-2: Define the material properties of longitudinal reinforcing steel (rebar) Go to Define >> Material Properties… and click on “Add New Material”. Enter the name “fy420 MPa” and select the properties of rebar as shown in the figure below. Then press OK.
ACECOMS, AIT
16/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 2-3: Define the material properties of shear reinforcing steel (Stirrup and Ties) Go to Define >> Material Properties… and click on “Add New Material”. Enter the name “fy280 MPa” and select the properties of rebar as shown in the figure below. Then press OK.
ACECOMS, AIT
17/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
3. Define Member Sections Step 3-1: Define Reinforcing Bar Sizes Go to Define >> Section Properties… >> Reinforcing Bar Sizes. Click at “Clear All Bars”, then press “Add Common Bar Set…”. Add “SI” rebar sizes, then click OK.
ACECOMS, AIT
18/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 3-2: Define Frame Section for Beams and Girder Go to Define >> Section Properties >> Frame Sections… and select on “Add New Property…” from Frame Properties menu. Then select “Concrete Rectangular”. Enter beam section properties for B1-500x250 (500 mm X 250 mm) as shown in figure below. Then press OK.
ACECOMS, AIT
19/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP For G1-700x300 (700 mm X 300 mm) girder section will be created by repeating previous step again. The information is shown in figure below. Then press OK.
ACECOMS, AIT
20/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 3-3: Define Frame Section for Columns Go to Define >> Section Properties >> Frame Sections… and select on “Add New Property…” from Frame Properties menu. Then select “Concrete Rectangular”. Enter column section properties for C1-500x500 (500 mm X 500 mm) as shown in figure below. Then press OK.
ACECOMS, AIT
21/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 3-4: Define Slab Section (Horizontal Area Element) Go to Define >> Section Properties >> Slab Sections… and select on “Add New Property…” from Slab Properties Menu. Enter slab section properties for S1-100 (thickness 100 mm) as shown in figure below. Then press OK.
ACECOMS, AIT
22/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
4. Draw the Members and Assign Supports Step 4-1: Setup Working Space and Working View Close Model Explorer window and 3-D View window by clicking
ACECOMS, AIT
button.
23/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Go to L2 (Z = 4 m) by clicking Set Plan View
button, then select L2 and click OK.
Select “Similar Stories” from the bottom right of Etabs program.
ACECOMS, AIT
24/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-2: Draw Columns (C1-500x500) at All Stories (Option: Similar Stories) Click on Quick Draw Columns button, select “C1-500x500” in Properties of Object dialog box. Draw columns at the grid line intersections from A-6 to F-2 by holding mouse click as shown in figure below.
Hold Click
Release
ACECOMS, AIT
25/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-3: Draw Girder (G1-700x300) at Story L2 to L5 (Option: Similar Stories) Click on Quick Draw Beams/Column button and select “G1-700X300”. Draw beams at the grid line intersections from A-6 to F-1 by holding mouse click as shown in figure below.
Hold Click
Release
ACECOMS, AIT
26/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-4: Draw Secondary Beams (B1-500x300) between Grid A and B (Option: Similar Stories) Go to Draw >> Snap Options and select “Line Ends and Midpoints”.
Click on Draw Beam/Column/Brace
ACECOMS, AIT
button and select “B1-500x250”
27/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Draw secondary beam at the middle of girder between Grid A and B from Grid 2 to 3 by clicking on Mid Point at both ends of beam as shown in figure below.
Click
Click Draw
Repeat previous steps to draw three more secondary beams at the middle of girder between Grid A and B from Grid 3 to 6 by clicking on Mid Point at both ends of beam as shown in figure below.
ACECOMS, AIT
28/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-5: Add Secondary Beams (B1-500x300) between Grid B to D (Option: Similar Stories) Select all secondary beams between Grid A and B, go to Select >> Select >> Properties >> Frame Sections, select “B1-500x250” and click on “Select” Button.
Copy selected beams, go to Edit >> Replicate, select “Linear” tab specify parameters as shown below and click on “OK”
ACECOMS, AIT
29/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-6: Add Secondary Beams (B1-500x300) between Grid C to F (Option: Similar Stories) Select all secondary beams between Grid A and B, go to Select >> Select >> Properties >> Frame Sections, select “B1-500x250” and click on “Select” Button.
Line 1-2
Go to Edit >> Replicate, select “Mirror” tab specify parameters as shown below and click on “OK”
ACECOMS, AIT
30/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-7: Assign B1-500x250 section at Beam along Grid 1(Option: Similar Stories) Click on “Select Object” to change to selecting mode, select all cantilever beams along grid 1, go to Assign >> Frame >> Section Property, select “B1-500x250” section and then press OK as shown in figure below.
ACECOMS, AIT
31/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-8: Draw Slab All Stories (Option: Similar Stories) Click on Draw Rectangular Floor /Wall button, select “S1-100” in Properties of Object dialog box. Draw slab at the grid line intersections from A-6 to F-1 by holding mouse click as shown in figure below.
Hold Click
Release
ACECOMS, AIT
32/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-9: Add Slab Opening at Stair Areas (Option: Similar Stories) Click on Draw Rectangular Floor /Wall button, select “Opening” in Properties of Object dialog box. Draw two slabs opening at stair areas as shown in figure below.
Draw Opening
ACECOMS, AIT
Draw Opening
33/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-10: Add Slab Opening at L2 (Option: One Story) Make sure that Plan View is “L2 Z=4(m)”, select “One Story” at right-bottom of screen, draw slab opening as shown in figure below.
Draw Opening
ACECOMS, AIT
34/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-11: Delete Secondary Beams at Slab Opening Area (Option: One Story) Click on “Select Object” to change to selecting mode, click on five secondary beams at slab opening area one by one and click on “Delete” in keyboard as shown in figure below.
Click on Beams One by One
Delete
ACECOMS, AIT
35/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-12: Draw Girder at the Base (Option: One Story)
Click on “Move Down in List”
button to move plan view from L2 to Base, click on Quick Draw
Beams/Column button, select “G1-700X300”, draw beams at the grid line intersections from A-6 to F-2 by holding mouse click as shown in figure below.
Hold Click
Release
ACECOMS, AIT
36/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 4-13: Assign Fixed Supports (Option: One Story) Click on Select Object
and select all joints at Base floor.
Select All Joints
Go to Assign >> Joint >> Restraints and select Fixed support, then press OK as shown in the figure below.
ACECOMS, AIT
37/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
The ETABS geometric modeling has finished. So, it can show the model in 3d view by clicking shown in figures below.
ACECOMS, AIT
button as
38/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
5. Assign Floor Diaphragm Step 5-1: Define Diaphragm Go to Define >> Diaphragms, select “D1” and click on Modify/Show Diaphragm. Click on “Semi Rigid” then press OK.
Step 5-2: Select All Floors Go to Select >> Select >> Object Type, choose “Floors” in Object Type dialog box, press Select and Close button.
ACECOMS, AIT
39/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 5-3: Assign Diaphragm to All Selected Floors Go to Assign >> Shell >> Diaphragms and select “D1” in Diaphragm Assignments”. Then press OK.
Click on Set Plan View
ACECOMS, AIT
button and select “L3” to show diaphragm has been assigned to floor.
40/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
6. Define and Assign Loads Step 6-1: Check “Dead” and “Live” for Load Patterns Go to Define >> Load Patterns, and check “Dead” and “Live” load patterns.
Step 6-2: Add “SDEAD” Load Patterns (Superimposed Dead Load) Specify parameters as shown in figure below and click on “Add New Load”.
Step 6-3: Add “WIN” Load Patterns Specify parameters as shown in figure below and click on “Add New Load”.
ACECOMS, AIT
41/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-4: Modify Lateral Load for “WIN” Load Patterns Select “WX” form list and click on “Modify Lateral Load”.
Specify parameters as shown below, ETABS will generate all cases based on code.
ACECOMS, AIT
42/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-5: Add and Modify Lateral Load for “StaticEQ” Load Patterns (Equivalent Static Earthquake) Specify parameters as shown in figure below and click on “Add New Load”, select “EQstatic” form list, and click on “Modify Lateral Load”. Then press OK.
ACECOMS, AIT
43/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-6: Add Response Spectrum Function for UBC-97 (NSCP-2015) Go to Define >> Functions >> Response Spectrum, select “UBC-97” from list and click on “Add New Function”.
Enter “RS” to be a function name and specify parameters as shown in figure below.
ACECOMS, AIT
44/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-7: Define Load Case (RSPX) for Response Spectrum Analysis in X Direction Go to Define >> Load Cases, click on “Add New Case”. Enter parameters as shown in figure below.
RSPX(I)/R = 9,806.65(1)/8.5 = 1,153.72 mm/s2
ACECOMS, AIT
45/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-8: Define Load Case (RSPY) for Response Spectrum Analysis in Y Direction Go to Define >> Load Cases, click on “Add Copy of Case”. Enter parameters as shown in figure below.
RSPY(I)/R = 9,806.65(1)/8.5 = 1,153.72 mm/s2
ACECOMS, AIT
46/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-9: Assign CHB Masonry Load to all Floors for “SDEAD” Load Pattern (Option: All Stories) Change from 3-D view to Plan View, go to “Base” floor and choose “All Stories” from the bottom right of Etabs program and select all perimeter beams as shown below.
Go to Assign >> Frame Loads >> Distributed and assign all parameters as shown in figure below. Then press OK.
ACECOMS, AIT
47/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
In 3D view.
ACECOMS, AIT
48/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-10: Assign Area Load to all Floors for “SDEAD” Load Pattern Clear display by clicking Show Undeformed Shape
button.
Go to Select >> Select >> Properties >> Slab Sections.., and enter “S1-100” as shown in figure below.
ACECOMS, AIT
49/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Go to Assign >> Shell loads >> Uniform.., and enter parameters as shown in figure below.
ACECOMS, AIT
50/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-11: Assign Area Load at Floors L2 to L4 for “Live” Load Pattern Go to Select >> Select >> Properties >> Slab Sections.., and enter “S1-100” as shown in figure below.
Deselect floor L5 by going to Select >> Select >> Stories, then choose “L5” and press “Deselect” and “Close”.
Go to Assign >> Shell loads >> Uniform.., and enter parameters as shown in figure below.
ACECOMS, AIT
51/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
ACECOMS, AIT
52/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 6-12: Assign Area Load at Floors L5 for “Live” Load Pattern Go to Select >> Select >> Properties >> Slab Sections.., and enter “S1-100” as shown in figure below.
Deselect floor L2 to L4 by going to Select >> Select >> Stories, then choose “L2” to “L4” by holding mouse click and press “Deselect” and “Close”.
ACECOMS, AIT
53/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Go to Assign >> Shell loads >> Uniform.., and enter parameters as shown in figure below.
ACECOMS, AIT
54/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
7. Define Mass Source Step 7-1: Define Mass Source Go to Define >> Mass Source, select “MsSrc1” and click on “Modify/Show Mass Source”.
Specify parameters as shown in figure below.
ACECOMS, AIT
55/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
8. Define Property /Stiffness Modifier and Rigid Zone Factor Step 8-1: Assign Property Modifiers for Beams Go to Select >> Select >> Object Type, select “Beams”, go to Assign >> Frames >> Property Modifiers and specify parameters as shown in figure below.
Local Axis for Frame Element (Beam)
ACECOMS, AIT
56/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 8-2: Assign Property Modifiers for Columns Go to Select >> Select >> Object Type, select “Columns”, go to Assign >> Frames >> Property Modifiers and specify parameters as shown below
Local Axis for Frame Element (Column)
ACECOMS, AIT
57/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 8-3: Assign Rigid Zone Factor for Column Go to Select >> Select >> Object Type, select “Columns”, go to Assign >> Frames >> End Length Offsets and specify parameters as shown below
Right click on beam
To satisfy strong column – weak beam criteria, the rigid zone factor for column should be 1.0 which need to be assigned in this step. While rigid zone factor for beams should be 0 which is default for ETABS. The rigid zone factor for beams can be checked by right clicking on beam and checking parameters as shown above figure
ACECOMS, AIT
58/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
9. Define Load Combinations Step 9-1: Define Load Combination of Mass Go to Define >> Load Combinations, click on “Add New Combo…” and specify all parameters as shown in figure below.
ACECOMS, AIT
59/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 9-2: Prepare the Load Combination in Excel Sheet Make the Excel sheet for load combination input based on the design criteria as shown in figure below.
The Excel sheet for Load Combination Input, Names in load case column must be same as load case name in ETABS (can be checked from Define >> Load Cases). Part 1
ACECOMS, AIT
Part 2
60/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 9-3: Open Interactive Database for Load Combination Go to Edit >> Interactive Database, select “Table: Load Combination Definitions” and press OK.
Click on “To Excel” button
ACECOMS, AIT
to transfer selected input data to Excel
61/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 9-4: Copy Load Combination Data into Exported Excel from ETABS Copy load combination data which prepared in previous step to exported Excel from ETABS.
Exported Excel from ETABS before copy load combination data from Excel
Exported Excel from ETABS after copy load combination data from Excel
Copy and paste all load combinations from previous step
ACECOMS, AIT
62/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 9-5: Retrieve Load Combination Data from Exported Excel into Interactive Database Copy load combination data which prepared in previous step to exported Excel from ETABS Click on “From Excel” button
ACECOMS, AIT
, then click on “Apply to Model” and “Done”.
63/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 9-6: View Load Combinations Go to Define >> Load combinations, select “SERV1” and click on “Modify/Show Combo”. SERV1combination has been created. Then press OK.
ACECOMS, AIT
64/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
10. Define P-Delta Options Step 10-7: Define P-Delta Options Go to Define >> P-Delta Options, select “Dead”, “SDEAD” and choose scale factor = 1.42, then press OK as shown in figure below.
Note: Scale Factors are from maximum safety factor for Mass (Dead + SDEAD) in ultimate load combination For P-Delta used in service load combination, this scale factors will be more conservative. LC Name
LF
TYPE
LF
SERV1 SERV2 SERV3 SERV4 SERV5
1.00 1.16 1.16 0.84 0.84
DEAD DEAD DEAD DEAD DEAD
1.00 1.16 1.16 0.84 0.84
ULG1 ULG2 ULD1 ULD2 ULD3 ULD4 ULD5 ULD6 ULD7 ULD8
1.40 1.20 1.42 1.42 0.98 0.98 1.12 1.12 0.68 0.68
DEAD DEAD DEAD DEAD DEAD DEAD DEAD DEAD DEAD DEAD
1.40 1.20 1.42 1.42 0.98 0.98 1.12 1.12 0.68 0.68
ACECOMS, AIT
TYPE LF TYPE Service Combinations SDEAD 1.00 LIVE SDEAD 1.00 LIVE SDEAD 1.00 LIVE SDEAD 1.00 LIVE SDEAD 1.00 LIVE Ultimate Combinations SDEAD SDEAD 1.60 LIVE SDEAD 0.50 LIVE SDEAD 0.50 LIVE SDEAD 0.50 LIVE SDEAD 0.50 LIVE SDEAD 1.00 RSPX SDEAD 0.30 RSPX SDEAD 1.00 RSPX SDEAD 0.30 RSPX
LF
TYPE
LF
TYPE
0.71 0.21 0.71 0.21
RSPX RSPX RSPX RSPX
0.21 0.71 0.21 0.71
RSPY RSPY RSPY RSPY
1.00 0.30 1.00 0.30 0.30 1.00 0.30 1.00
RSPX RSPX RSPX RSPX RSPY RSPY RSPY RSPY
0.30 1.00 0.30 1.00
RSPY RSPY RSPY RSPY
65/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
11. Run Analysis Step 11-1: Check Model Go to Analyze >> Check Model, select the information as shown in the figure below.
No warning
Wait until the program is finished.
ACECOMS, AIT
66/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 11-2: Set Degree of Freedom Go to Analyze >> Set Active Degree of Freedom, select “Full 3D”, then press OK.
Step 11-3: Run Analysis Go to Analyze >> Set Load Cases To Run and click on “Run Now” as shown in the figure below. ETABS will display deformed shape of model when analysis complete.
ACECOMS, AIT
67/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
ETABS will display deformed shape of model when analysis complete. Check the information of this analysis by going to Analyze >> Last Analysis Run Log.
ACECOMS, AIT
68/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
12. View the Analysis Results and Modify Response Spectrum Step 12-1: Display Deformed Shape for Mode Shape Go to Display >> Deformed shape, select “Mode: and specify “Mode number” and click “OK”
Animation of Deformed Shape can be displayed by clicking “Start Animation”
ACECOMS, AIT
69/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-2: Check Modal Participating Mass Ratios Go to Display >> Show Table, select item as shown in figure below and click “OK”
Make sure the modal participating mass ratios for UX, UY and RZ at least 90 percent of total mass. (“SumUX”, “SumUY” and “SumRZ” at last mode > 0.9)
ACECOMS, AIT
70/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP If SumUX”, “SumUY” and “SumRZ” at last mode are less than 0.9, go to Define >> Load Cases, select “Modal”, click on “Modify/Show Case”, increase “Maximum Number of Modes” as shown in figure below. Run analysis and repeat this step to check modal participating mass ratios again.
Increase “Maximum Number of Modes”
ACECOMS, AIT
71/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-3: Check Total Base Shear for Seismic Loads Go to Display >> Show Table, select “Base Reactions” from list, click on “Select Load Cases”, select “RSPX”, “RSPY” and “StatcEQ”, click on “Select “Combos” and click on “Clear All”
-2174.2903 1906.5921 1968.0015
ACECOMS, AIT
72/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
Data from ETABS Vt = Total base shear for Response Spectrum Analysis Vt = 1,907 kN (RSPX)
➔ Total Base Shear due to Response Spectrum Analysis (Factor = I/R)
Vt = 1,968 kN (RSPY)
➔ Total Base Shear due to Response Spectrum Analysis (Factor = I/R)
Vs = 2,174 kN
➔ Total Base Shear due to Static Equivalent
Calculate Scale Factor for RS Refer to NSCP-2015 ➔ Vt > 0.9 Vs 0.9 Vs = 0.9 x 2,174
= 1,957 kN
Scale Factor for RS
= 0.9 Vs / Vt
Scale Factor for RSPX
= 1,957 / 1,907
= 1.03
Scale Factor for RSPY
= 1,957 / 1,968
= 1.00
ACECOMS, AIT
73/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-4: Unlock Model Click on Lock/Unlock Model
ACECOMS, AIT
button and press OK.
74/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-5: Change Scale Factor for Response Spectrum Analysis in X Direction (RSPX) Go to Define >> Load Cases, select “RSPX” and click on “Modify/Show Case”.
Enter “1153.72*1.13” at “Scale Factor” as shown in figure below and click OK
ACECOMS, AIT
75/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-6: Rerun Analysis Click on Run Analysis
ACECOMS, AIT
button. ETABS will display deformed shape of model when analysis complete.
76/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-7: Select Corner Nodes at Roof to Check Displacement due to Wind Load (Option: One Story) Select “One Story” option at bottom-right of screen and click on corner nodes at roof as shown below.
Click Click
Click
Click
Step 12-8: Display Displacement Table due to Wind Load for All Corner Nodes at Roof Go to Display >> Show Tables and select parameters as shown below, click on “Select Load Cases” and select “WIN”.
ACECOMS, AIT
77/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Refer to table for displacement due to Wind load, each node has 12 cases (Step Number) for wind load according to code. Maximum displacement due to wind load will be compared with the limit.
Note: Wind speed used in this analysis is for ultimate load. To check displacement, wind speed for service load is required. Please refer to NSCP to scale wind speed and the displacement in above table.
ACECOMS, AIT
78/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-9: Select All Corner Nodes to Check Story Drift due to Seismic Load (Option: All Stories) Select “All Stories” option at bottom-right of screen and click on nodes at all corners as shown in figure below
Click Click
Click
Click
Step 12-10: Display Story Drift Table due to Seismic Load for All Corner Nodes Go to Display >> Show Tables and select parameters as shown below, click on “Select Load Cases” and select “RSPX” & “RSPY”.
ACECOMS, AIT
79/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
The maximum story drift due to “RSPX” and “RSPY” in above table will be multiplied with 0.7 x R and compared with the limit.
ACECOMS, AIT
80/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-11: View Force Diagram for All Frame Elements Go to Display >> Force/Stress Diagrams >> Frame/Pier/Spandrel/Link Forces, specify Load Case/ Load Combination/ Mode Case and select Force Diagram (“Components”)
Force Diagram for Frame Elements (Moment Diagram)
ACECOMS, AIT
81/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 12-12: View Force Diagram for Individual Frame Element During ETABS displays force diagram, right click at desired frame element to display individual force diagram.
Right Click
ACECOMS, AIT
82/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Note: Sign Convention for Frame Element
ACECOMS, AIT
83/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
13. Run Concrete Frame Design and View the Design Results Step 13-1: Define Design Code for Concrete Frame Design Go to Design >> Concrete Frame Design >> View/Revise Preferences, change “ACI 318-14” in Design Code then press OK.
ACECOMS, AIT
84/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-2: Define Framing Type for Concrete Frame Design Go to Select >> Select >> All or Click on Select All button, go to Design >> Concrete Frame Design >> View/Revise Overwrites, choose “Sway Intermediate” in Framing Type, and press OK.
ACECOMS, AIT
85/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-3: Specify Load Combinations for Concrete Frame Design Go to Design >> Concrete Frame Design >> Select Design Combinations, select all ultimate load combination (ULD1 to ULD5 & ULG1 to ULG2) from “List of Combination” (left box) and click “>>” to move selected load combination to “Design Combinations” (right box). The load combination details can be viewed by selecting load combination and clicking on “Show”.
ACECOMS, AIT
86/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-4: Run Concrete Frame Design Go to Design >> Concrete Frame Design >> Start Design/Check, then wait until the design is finished.
Step 13-5: View Concrete Frame Design Results Go to Design >> Concrete Frame Design >> Display Design Info, select desired design results from List.
ACECOMS, AIT
87/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-6: View Concrete Frame Design Results for Beams Change view to Plan View by clicking on Set Plan View button or go to Design >> Concrete Frame Design >> Display Design Info, select “Longitudinal Reinforcing” from List. Right click on desired beam to view individual design results
1. Right Click (As)
(As/S)
(As)
ACECOMS, AIT
88/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-7: View Concrete Frame Design Result Details for Individual Beam Details and Diagram of concrete frame design for individual beam can be viewed by clicking on below buttons.
Z
ACECOMS, AIT
89/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-8: View Concrete Frame Design Results for Columns Change view to Plan View by clicking on Set Elevation View button or go to Design >> Concrete Frame Design >> Display Design Info, select “Longitudinal Reinforcing” from List. Right click on desired column to view individual design results
(As/S)
2. Right Click (As/S)
(As)
ACECOMS, AIT
90/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-9: View Concrete Frame Design Result Details for Individual Column Interaction Diagram and Details of concrete frame design for individual column can be viewed by clicking on below buttons.
ACECOMS, AIT
91/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 13-10: Check Concrete Fame Design Failure Go to Design >> Concrete Frame Design >> Display Design Info, select “Identify Shear Failure” from List. For this example, there are two cantilever beams at L2 which have shear design failure. To see design details, right click on failure beams to display design information, click on “Details” to see design details. In “Design Details” window and select “Shear Details” tab. At page 2 for “Shear Details” shows message “Shear stress due to shear force and torsion together exceeds maximum allowed”
Right Click
ACECOMS, AIT
92/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Note: these two failure cantilever beams have high torsion (especially in lower story) due to unbalance bending moment form secondary beam at tip of cantilever (which will be torsion in cantilever).
8m
5m
Unbalance moment in secondary beam to be torsion in main beam
Step 13-11: Reduce the Torsion stiffness in Beas and Reanalysis + Redesign To avoid this failer, the torsion stiffiness for all beams can be partially released by repeating Step 8-1: for Assign Property Modifiers for Beams (Page 56) and reducing “Torsional Constant” together with “Moment of Inertia about 3 axis” then run + design again and check “Identify Shear Failure”.
ACECOMS, AIT
93/103 OK
OK
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
14. Generate and Export the Report Step 14-12: Select Items to be Added in the Report Go to Files >> Create Report >> Add New User Report
Select items to be added in the report and click on “Create”
ACECOMS, AIT
94/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 14-13: Generate the Report If all items will be added in report, go to Files >> Create Report >> Show Project Report ETABS will generate the report as shown in figure below. The report will contain all input, analysis and design information which can be viewed by selecting items at “Model Explorer” (“Reports” tab) at left column.
Step 14-14: Export the Report to MS Word Click on “Export to Word Document”
ACECOMS, AIT
button and specify the location to save MS Word file.
95/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
15. Generate and Export the Drawings by CSiDetail Before start CSiDetail, please make sure that ETABS model has been saved after running concrete frame design. Step 15-15: Open CSiDetail and Specify ETABS Location Open CSiDetail, go to Options >> ETABS Settings, click on “Browse” and specify “ETABS.exe” at folder where ETABS has been installed. (for ETABS v20: C:\Program Files\Computers and Structures\ETABS 20\).
a
For ETABS v20
ACECOMS, AIT
96/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 15-16: Open ETABS Model in CSiDetail Go to File >> New Detailing, select ETABS Model, CSiDetail will open ETABS and import design data and check warning message will be appeared
\
One warning will be displayed due to no slab design results (design strip) not be conducted in ETABS model. Click on “OK” to accept this warning Note: If torsion in beams have not been reduced (at page 93), two more warnings for shear stress in beams will be reported.
ACECOMS, AIT
97/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 15-17: Change the Detailing Units Click on “Detailing Units” button
Select “Metric” from “Units”
ACECOMS, AIT
98/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 15-18: Specify Parameters and Generate Objects to be used in the Drawings Click on each button in “Preference” to specify parameters to be used in the drawings and click on “OK”
CSiDetail will generate objects (plans, sections and details) accordingly to specified parameters. Click on items in left columns to view each object one by one.
ACECOMS, AIT
99/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 15-19: Add/ Modify Section in Slabs/Mats Sections in framing plan can be added or modified from Detailing >> Add/Modify Sections >> Slabs/Mats and select floor from list
Step 15-20: Add/ Modify Section in Beams Sections in beams can be added or modified from Detailing >> Add/Modify Sections >> Beams and select beams from list
ACECOMS, AIT
100/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 15-21: Add Objects into Drawings Go to Drawings >> Add Views to Drawings, select objects to be added into drawing and click on “OK”
In left column shows 49 drawings have been added into “Drawing Sheets”. Each drawing can be viewed by clicking in each item under “Drawing Sheets”.
ACECOMS, AIT
101/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP Step 15-22: Export Drawings Go to Drawings >> Export Drawing(s), select file format (recommend for “DXF” for version compatibility), specify “Target Directory” and click on “Start Export”
Go to “Target Directory” and view exported drawings
ACECOMS, AIT
102/103
ETABS Tutorial Example: Structural Analysis & Design of 5 Story RC Building for SESS2022 by ASEP
Please contact ACECOMS (
[email protected]) if you would like to request CSI software quotaions (SAP2000, ETABS, SAFE, CSiBridge, Perform3D & CSiDetail) with special price for Users in Philippines
ACECOMS, AIT
103/103
