95127969 sap2000 v9 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

4/28 Analysis of Prestressed Concrete Beam

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


Analysis of Prestressed Concrete Beam 5/28

Concrete Material Properties (kg-cm)



Tendon Properties and Prestress Load(kg-cm)



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



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

Enter parameters as shown in figure below.



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



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



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.



3. Define and Assign Beam Section Properties

Step 3-1: Select Beam Click on beam or draw selection rectangular to cover on it.



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.



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



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



5. Define and Assign Tendon

Step 5-1: Draw Tendon Click on Draw Frame/Cable Element button and select “Tendon from “Line Object Type”

Make sure that Point and Grid Intersection button is activated, click on start and end node



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



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

2

3



Step 5-4: View Tendon Profile

Parabolic curve for tendon profile has been created.



6. Assign Prestress Load and Tendon Properties

Step 6-1: Select Tendon Click on Set Select Mode button to change to selection mode and click on tendon line.



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.



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.



8. Run Analysis

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



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.



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



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



Step 9-2: Display Moment 3-3 Diagram



Note: Sign Convention for Frame Element

95127969 sap2000 v9 example prestress beam

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