95127969 sap2000 v9 example prestress beam
TRANSCRIPT
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
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 5/28
Concrete Material Properties (kg-cm)
SAP2000 Tutorial Example ACECOMS, AIT
6/28 Analysis of Prestressed Concrete Beam
Tendon Properties and Prestress Load(kg-cm)
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 7/28
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
SAP2000 Tutorial Example ACECOMS, AIT
8/28 Analysis of Prestressed Concrete Beam
Step 1-2: Select Template and Specify 3D Frame Parameters Select “Beam” from template list
Enter parameters as shown in figure below.
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 9/28
Step 1-3: Close “3D View Window Close “3D View” window by clicking on
SAP2000 Tutorial Example ACECOMS, AIT
10/28 Analysis of Prestressed Concrete Beam
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
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 11/28
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.
SAP2000 Tutorial Example ACECOMS, AIT
12/28 Analysis of Prestressed Concrete Beam
3. Define and Assign Beam Section Properties
Step 3-1: Select Beam Click on beam or draw selection rectangular to cover on it.
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 13/28
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.
SAP2000 Tutorial Example ACECOMS, AIT
14/28 Analysis of Prestressed Concrete Beam
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
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 15/28
Step 4-2: Add “PRESTRESS” Load Case Repeat Step 4-1 to add “PRESTRESS” load case
SAP2000 Tutorial Example ACECOMS, AIT
16/28 Analysis of Prestressed Concrete Beam
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
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 17/28
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
SAP2000 Tutorial Example ACECOMS, AIT
18/28 Analysis of Prestressed Concrete Beam
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
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 19/28
Step 5-4: View Tendon Profile
Parabolic curve for tendon profile has been created.
SAP2000 Tutorial Example ACECOMS, AIT
20/28 Analysis of Prestressed Concrete Beam
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.
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 21/28
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.
SAP2000 Tutorial Example ACECOMS, AIT
22/28 Analysis of Prestressed Concrete Beam
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.
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 23/28
8. Run Analysis
Step 8-1: Set Analysis Options Go to Analyze >> Set Analysis Options and select “XZ Plane”
SAP2000 Tutorial Example ACECOMS, AIT
24/28 Analysis of Prestressed Concrete Beam
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.
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 25/28
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.
SAP2000 Tutorial Example ACECOMS, AIT
26/28 Analysis of Prestressed Concrete Beam
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
SAP2000 Tutorial Example ACECOMS, AIT
Analysis of Prestressed Concrete Beam 27/28
Step 9-2: Display Moment 3-3 Diagram
SAP2000 Tutorial Example ACECOMS, AIT
28/28 Analysis of Prestressed Concrete Beam
Note: Sign Convention for Frame Element