Etabs 02 Create Steel Frame Building

Create New Model.

Modify/Show Grid system…  Quick Start New Rectangular Guide

Define  Section Properties  Frame Sections

Import New Properties 

Concrete Rectangular  Steel I-Beam  select W16x26 to W18x175

Result: w16x26 to w18x175 will appear as following  OK

Properties  Frame Section  Add New Frame Property  Auto Selection List

RENAME Property Name to AUTOLATBM  Select W16x26 to W18x175 add to Auto Select List  OK

Go to Define  Section Properties  Frame Sections  Import New Properties  Auto Select List

 Select 2 item: ‘A-CompBm’ and ‘A-LatCol’.  OK  OK

At the bottom Right Corner, Choose Similar Stories.

Go to Edit  Edit Story and Grid System Data  Modify/Show Story Data

NOTE: by default, the Story4 is labelled as Master Story. Story1,2,3 is similar to Story4.

Create Column by Choosing Quick Draw Columns Button.  Properties of object box will pop up. Make sure the property is set to A-LatCol.  Set angle to 90 degree (notice the column change in position).

Click at D1 to insert column.

Column Details (Angle Position): A

B

C

D

1 2 3 4

0 0 0 0

0 0 0 0

0 0 0 0

90 90

Go to cursor mode  Ctrl + Click on column A2  Select Column C7  RESULT: notice that the bottom left shows 4 frames selected.

Repeat this process for B2, A3, C3 and C4. RESULT: 20 frames selected.

Assign  Frame  Local Axes

Choose Frame object Major Direction is Y.  Apply. RESULT: Notice the 5 columns (20frames) selected rotated 90degrees. Reason: We have defined the orientation of the selected to major direction that is Y direction.

Assign clear display of assign

Go to Set Display Options  Add a Tick at Extrude Frames  Tick at Apply to All Windows  Apply  OK

CREATE BEAM Quick Draw Beams  Property = AUTOLATBM.

Add Beam as followings: NOTE: the beam are level due to the similar properties as we have set it that way.

Use cursor mode, Select Beam C/2-3  Edit  Delete.

CREATE SECONDARY BEAM

Select  Select  Intersecting Line

The selected Beam as follows  Edit  Delete.

DRAW FLOORING OBJECTS Remove the Extrude Frame View Options.

Rename property to Deck1

Make sure ‘Snap to Grid Intersections & Points’ is active

Draw the slab needed. Click enter to finish it.

This indicate the direction of the deck span.

Use cursor mode  define  Section Properties  Deck Sections.

Modify/Show Property  Modify the slab depth to 3in.

Draw  Auto Draw Cladding

Set Elevation View  Plan A.

You can right click to show below:

Select plan view.

Define – Load Patterns

MODFIY LOAD: Select Live Load, change type to Reducible Live  Modfiy Load

ADD LOAD: 1. Rename load name to SDead (super imposed dead load), Choose Type: Super Dead  Add New load.

2. Rename load name to Cladding , Choose Type: Super Dead  Add New load.

3. Rename load name to Eqy , Choose Type: Seismic, Auto Lateral Load: ASCE: 7-10  Add New Load --> Modify Lateral Load

Uncheck the following  OK

4. Rename load name to Windx , Choose Type: Wind, Auto Lateral Load: ASCE: 7-10  Add New Load --> Modify Lateral Load  Include Shell Objects, Wind speed = 100mph  OK  OK

ADD SHELL LOAD Firstly, select top deck (not beam!), then add.

Off snap to grid button.

Select (with cursor) all the preliminary beam (boundary). Note that 1 beam = 4frames due to similar stories design.

3D-mode:

Go back to Plan View

CREATE WIND LOAD – Create Wind Load @ Right Elevation First, create the elevation view of the right side of the building – so that the wind load can be apply to it.

New Developed Elevation Name: RIGHT (to apply wind load @ right elevation) OK

Turn On Snap to Grid intersections and Points. Select the following RIGHT elevation, Click on column D1, D2, B2, B3, C3, C4  Enter

RESULT:

Back to Plan View. MAKE SURE: The wind load direction is on positive x-direction on the right elevation, negative xdirection on the left elevation. Click on 3D view, set view options  Object Assignments  CHECK local Axes.

RESULT:

Positive side on right Elevation as above and Negative side on left elevation as below.

Uncheck the local axes and back to basic 3D view

Select Elevation View  “A”  OK (note: A view here is the same as left elevation)

SELECT the whole A panel. (notice the doted line)

Wind Load Pattern Name: Windx  Coefficient, Cp : -0.8 (so that the wind load is at the positive xdirection acting on the A panel).  CHECK Windward (varies).

Choose RIGHT Elevation View:

Select the following 3 panels

Coefficient, Cp :0.5  Leeward or Sides (Constant)  OK

Assign  Clear Display of Sign  3D view. Check Load applied:

RUN ANALYSIS

Right Click on the beam – to bring out individual diagram.

NOTE: Display location – Show Max OR Scroll for Values. E.g Scroll for Values 6.5ft from the joint.

Reset the display to Underformed shape -> 3D view

Right Click on the Secondary Beam:

Design  Composite Beam Design  View/Revise references::

Check for information of other tabs too:: Beam, Deflection, Vibration, Prices, Factors…

FOR 3D view, go to display option, UNCHECK the object fill and all null shells.

Verify Analysis and Design Section

Select NO this time? Why? Right click on 1 of the secondary beam, you will notice that last analysis and current design/next analysis are not the same.

The accepted Sections List shows all the members that are adequate for the design.

Click the DETAILS button, and it pop out a window that shows all the information about the beam: this report may be printed or export as word document.

To Rerun the Analysis: 1. Analyze  run Analysis 2. Design  Composite Beam Design  Start Design/check 3. Design  Composite Beam Design  Verify Analysis vs Design Section

RESULT: 4. Final Check: Design  Composite Beam Design  Verify all members passed

RESULT:

Click the SELECT ALL button:

Design  Composite Beam Design  Make Auto Select Section Null

Click ok the remove auto select section and replace with the current design section. Click CLEAR SELECTION button to clear the selection.

Select  Select  Properties  Frame Sections

Select AUTOLATBM  Select  Close

Design  Steel Frame Design  Lateral Bracing

Select User Specified  Specify Point Bracing

On the Plan View tab  Right Click on the Beam as follow:

Note the design procedure is Steel Frame Design.

Go to 3D-view tab, Design  Steel Frame Design  Start Design/Check

Click NO::

Design  Steel Frame Design  Display Design Info

Make sure the P-M Ratio is selected (both 3D view and Plan View Tab)

Right Click on the Beam:

Again: note that the analysis section and design section are different. here shows the auto generated code suitable steel sections that are adequate for design.

Design  Steel Frame Design  Select Design Combinations:

Analyze  run Analysis Design  Steel Frame Design  Start Design/Check

Again, if the analaysis and design still do not match, Click YES to rerun: Design  Steel Frame Design  Verify Analysis vs Design sections

Design  Steel Frame Design  Verify members passed

END.