SAP2000 Example Prestress Beam

SAP2000 Tutorial Example Analysis of Prestressed Concrete Beam (Metric Units) ACECOMS, AIT

Table of Content Objective............................................................................................................................4 Problem..............................................................................................................................4 1.

Create simple beam using Template.............................................................. 7

2.

Define Material............................................................................................ 10

3.

Define and Assign Beam Section Properties ............................................... 12

4.

Define Load Case ........................................................................................ 14

5.

Define and Assign Tendon .......................................................................... 16

6.

Assign Prestress Load and Tendon Properties ............................................ 20

7.

Define Load Combination ........................................................................... 22

8.

Run Analysis ............................................................................................... 23

9.

View Moment Diagram ............................................................................... 26

SAP2000 Tutorial Example

ACECOMS, AIT

Objective To demonstrate and practice step-by-step modeling and analysis of prestressed concrete beam

Problem Carry out modeling and analysis of prestressed concrete beam as shown in following details and find the moment diagram for combination of dead load, live load and prestress load

Dimension and Loading

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

ACECOMS, AIT

Concrete Material Properties (kg-cm)

Analysis of Prestressed Concrete Beam

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SAP2000 Tutorial Example

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Tendon Properties and Prestress Load(kg-cm)

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

ACECOMS, AIT

Step by Step 1. Create simple beam using Template Step 1-1: Start SAP2000 and Select Working Unit Start up screen of SAP2000, select working unit to be “Ton-m” at drop-down menu on the bottom-right of screen and click on New Model button to start new model with template

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SAP2000 Tutorial Example

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Step 1-2: Select Template and Specify 3D Frame Parameters Select “Beam” from template list

Enter parameters as shown in figure below.

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 1-3: Close “3D View Window Close “3D View” window by clicking on

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SAP2000 Tutorial Example

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2. Define Material Step 2-1: Change Working Unit Select working unit to be “kg, cm, C” from second drop-down at right-bottom of screen

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 2-2: Specify Material Properties for Concrete “CONC” Go to Define >> Material, select on “CONC” and click on “Modify/Show Material”.

Enter material properties as shown in figure below.

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SAP2000 Tutorial Example

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3. Define and Assign Beam Section Properties Step 3-1: Select Beam Click on beam or draw selection rectangular to cover on it.

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 3-2: Specify Section Dimension Go to Assign >> Frames/Cables/Tendons >> Frame Sections, select “Add Rectangular” from second drop-down menu and click on “Add New Property”

Enter section dimension as shown in figure below.

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SAP2000 Tutorial Example

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4. Define Load Case Step 4-1: Add “LIVE” Load Case Go to Define >> Load Cases and enter “LIVE” load case as shown in figure below

Click on “Add New Load” to add “LIVE” load case in list

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 4-2: Add “PRESTRESS” Load Case Repeat Step 4-1 to add “PRESTRESS” load case

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SAP2000 Tutorial Example

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5. Define and Assign Tendon Step 5-1: Draw Tendon Click on Draw Frame/Cable from “Line Object Type”

Element

button

Make sure that Point and Grid Intersection button end node

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and

select

“Tendon

is activated, click on start and

Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 5-2: Define Tendon Profile After draw the tendon on beam, “Tendon Data For Line Object3” dialogue will appear, click on “Parabolic Calculator” button

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SAP2000 Tutorial Example

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Step 5-3: Define Parabolic Curve for Tendon Enter “Number of Points” = 3, click on “Quick Start” and change “Coord 2” on table as shown below.

1

3

2

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 5-4: View Tendon Profile Parabolic curve for tendon profile has been created.

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SAP2000 Tutorial Example

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6. Assign Prestress Load and Tendon Properties Step 6-1: Select Tendon Click on Set Select Mode button tendon line.

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to change to selection mode and click on

Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

ACECOMS, AIT

Step 6-2: Specify Prestress Load and Tendon Properties Go to Assign >> Frame/Cable/Tendon Loads >> Tendon Loads and specify parameters as shown in figure below.

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SAP2000 Tutorial Example

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7. Define Load Combination Step 7-1: Select Tendon Go to Define >> Combinations and click on “Add New Combo”.

Select “Case Name” and click on “Add” to add “DEAD”, “LIVE” and “PRESTRESS” load case to “COMB1”load combination one by one.

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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8. Run Analysis Step 8-1: Set Analysis Options Go to Analyze >> Set Analysis Options and select “XZ Plane”

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SAP2000 Tutorial Example

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Step 8-2: Start Analysis Go to Analyze >> Run Analysis, select “MODAL” from the list and click on “Run/Do Not Run Case” to stop “MODAL” analysis case from running. Click on “Run Now”

Specify file name and click on “Save” to save model.

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 8-3: View Analysis Details and Check Error Message Wait until analysis status dialogue and scroll up to check error message.

Analysis of Prestressed Concrete Beam

shows

“ANALYSIS

COMPLETE

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SAP2000 Tutorial Example

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9. View Moment Diagram Step 9-1: Select Load/Load Combination and Component to Display Go to Display >> Show Forces/Stresses >> Frames/Cables and specify parameters as shown below

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Analysis of Prestressed Concrete Beam

SAP2000 Tutorial Example

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Step 9-2: Display Moment 3-3 Diagram

Analysis of Prestressed Concrete Beam

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SAP2000 Tutorial Example

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Note: Sign Convention for Frame Element

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Analysis of Prestressed Concrete Beam