Spiral Staircase in sap2000

SAP2000 Tutorial Example

Analysis of Spiral Staircase (Metric Units)

ACECOMS, AIT

Table of Content Objective............................................................................................................................4

Problem..............................................................................................................................4

Step by Step.......................................................................................................................7

1. Create Spiral Staircase Model from Template............................................... 7

2. Assign Supports (Restraints) ....................................................................... 11

3. Add New Load Case.................................................................................... 14

4. Assign Uniform Load on Staircase.............................................................. 15

5. Define Staircase Thickness.......................................................................... 17

6. Run Analysis ............................................................................................... 19

7. View Deformed Shape and Moment Data................................................... 21

8. View Reaction in Tabular Form .................................................................. 25

SAP2000 Tutorial Example ACECOMS, AIT

4/27 Modeling and Analysis of Spiral Staircase

Objective

To demonstrate and practice step-by-step on the modeling and analysis of spiral staircase.

Problem Carry out analysis of spiral staircase with the following details

3D View


Modeling and Analysis of Spiral Staircase 5/27

Plan View

Elevation View

3 m

1 m

4.5 m



Load Cases

Load Name Load Type Details

DEAD Dead

Self Weight (Calculate automatically by Self Weight Multiplier)

+ 0.20 ton/m2 for Steps and Finishing

(Uniform Area Load on Slab Panels)

LIVE Live 0.4 ton/m2 (Uniform Area Load on Slab Panels)



Step by Step

1. Create Spiral Staircase Model from 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 “Staricase” from template list and select “Sprial Staircase

Enter parameters as shown in figure below



Note: Click on “Parametric Definition” to see notations for dimension



Step 1-3: Create Spiral Staircase Spiral staircase has been created by parameters specified from previous steps.

Note: To Show Shell Panels in Solid Shade

Go to View >> Set Display Options or click on Set Display Options button and select “Fill Object” and “”Apply to All Windows”



2. Assign Supports (Restraints)

Step 2-1: Select All Nodes at Bottom of Staircase Activate “X-Y Plan” window by clicking on right window area, make sure that current plan view is at Z = 0 by clicking at the top of this window. (If not using Move Down in List or Move Up in List to change Plan view elevation) and draw the selection rectangular to cover all nodes at bottom of stair as shown in figure below.



Step 2-2: Assign Fix Support at Bottom of Staircase Go to Assign >> Joint >> Restraints and select Fix support type as shown in figure below.



Step 2-3: Assign Fix Support at Top of Staircase Click on Move Up in List to move plan view to top of the stair and draw the selection rectangular to cover all nodes at top of stair as shown in figure below.

Go to Assign >> Joint >> Restraints and select Fix support type as shown in figure below.



3. Add New Load Case

Step 3-1: Add “LIVE” Load Case Go to Define >> Load Cases and enter load case parameters as shown below.

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

.



4. Assign Uniform Load on Staircase

Step 4-1: Assign Uniform Load for “DEAD” Load Case at All Shell Panels

Click on Select All button to select all elements in model and go to Assign >> Area Load >> Uniform (Shell) and enter load parameters as shown in figure below.



Step 4-2: Assign Uniform Load for “LIVE” Load Case at All Shell Panels Click on Select All button to select all elements in model and go to Assign >> Area Load >> Uniform (Shell) and enter load parameters as shown in figure below.



5. Define Staircase Thickness All staircase panels have been assigned by “ASEC1” shell section property automatically from step 1-2. This step is to specify stair thickness.

Step 5-1: Specify Slab Thickness Go to Define >> Area Sections, select “ASEC1” and click on “Modify/Show Section”



Step 5-2: Specify Area Thickness

Enter area thickness as shown in figure below.



6. Run Analysis Step 6-1: Start Analysis Go to Analyze >> Run Analysis or click on Run Analysis button and click on “Run Now”

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



Step 6-2: View Analysis Details and Check Error Message Wait until analysis status dialogue shows “ANALYSIS COMPLETE and scroll up to check error message.



7. View Deformed Shape and Moment Data

Step 7-1: Select Load Case to Display Deformed Shape Go to Display >> Show Deformed Shape or click on Show Deformed Shape button and select desired Case/ Combo Name.



Step 7-2: Display Deformed Shape and View Particular Displacement Displacement details at particular node will display when moving cursor close to that node. To view deformed shape in animation, click on “Start Animation” button. Click on or to reduce/increase animation speed. Right click on desired node to view particular displacement value.



Step 7-3: Display Moment on Staircase Go to Display >> Show Forces/Stresses >> Shell and select desired “Case/Combo Name” and “Component”. Right mouse click on desired panel to view particular moment

Note: Move mouse cursor over this particular diagram to view moment at particular point



Note: Sign Convention for Shell Element



8. View Reaction in Tabular Form

Step 8-1: Select Reaction and Analysis Case to Display in Table Go to Display >> Show Tables, select “Reaction as shown in figure below, click on “Select Analysis Cases” and select only “DEAD” and “LIVE” by clicking on them one by one while holding “Ctrl” button



Step 8-2: Display Reaction in Table Go to Display >> Show Deformed Shape or click on Show Deformed Shape button and select desired Case/ Combo Name.



Note: Joint Label can be displayed from View >> Set Display Options or clicking on Set Display Options and select “Labels” in “Joints”

Spiral Staircase in sap2000

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