Week 7 Challenge

Modelling of Structure in STAAD Pro

1. Modelling of a structure exercise

Model a structure with following details

• Bay spacing 5 m
• Span of Truss 30 m
• Shape of Truss – Pratt Truss
• Slope of truss 20 degree
• Height of the column 15 m
• Floor Beams at 5 m from base
• Secondary beams at 1.5 c/c
• Length of the building 50 m
• Column Supporting Floor Beam @ 6 m c/c Along the frame

Aim:-

To Model a structure with above details using STAAD Pro.

Introduction:-

• STAAD's full form is Structural Analysis and Design. STAAD Pro is one of the popular software that is used for analyzing & designing structures like – buildings, towers, bridges, industrial, transportation, and utility structures.

Procedure:-

Step 1:-

• Open STAAD.Pro CONNECT Edition software.
• Then Click Configure option to set basic Unit and Global Axis as shown below.

• Now give File Name and select the location to save the Project.
• And Click Create option. A Workspace opens.

Step 2:-

• Now create a node to draw the Truss members.
• In Nodes window create a node with the coordinates of (0,0,0).

• Again create the node at coordinate (15,0,0).

• Now join the nodes 1 & 2 by creating the beam using Beams window.

• For given slope 20°, height of Truss arrived as 5.45955m.
• Then insert node at height 5.45955 (15,5.45955,0)

• Then draw beams between the nodes (2-3) and (1-3) as shown below.

• Now split the Beam 1 and Beam 3 into 5 parts as shown below.

• Now form Truss by connecting the nodes in the Beam 1 & Beam 3.

Step 3:-

• Select Mirror Option to create the Truss on another side.
• Then choose the node to Mirror along the aixs.

• To create column, Right the mouse cursor and choose Nodes cursor.
• Then select the end nodes by Holding Ctrl Button in the Keyboard.

• Then Copy the Nodes and paste it in Y-Direction of distance -15m.

• Now Nodes are created.

• Connect the nodes to form external column.

• To draw Primary beams select and copy the column base nodes to 5m along Y-Direction as shown below.

• Then connect the nodes to create Primary beams.

• Now splitup the beam to 5 parts to draw the Supporting column.

• Now select and copy the nodes selected in the Figure to draw the supporting column.

• Then create nodes for Secondary beams by Insert 3 nodes between each column.

Step 4:-

• Select the Translational Repeat tool to form the Shed model.

• Then click Z-Direction, No. of Steps as 10 and Spacing as 5m.
• Check the Link steps and Open base as shown below.
• Thyen click Ok.

Result:-

• Pratt Truss was created successfully using STAAD Pro software.

2. Applying Specification and member property for modelled structure

Apply beam steel specification as mentioned below.

• Columns - ISMB 500
• Truss -Top & Bottom chord – ISA 110x110x12, Diagonal member – ISA 75x75x8
• Purlins – ISMC 150
• Tie Beam – ISA 120x120x10
• Floor Primary beams – ISMB 300
• Secondary beams - ISMC 150
• Floor beam supporting columns – ISMB 300
• Assume bottom of the main column as Fixed support & intermediate floor beam supporting column as pinned
• Orient the Angle sections by applying Beta angle.

Aim:-

To apply Specifications and Member property for modelled structure in Question 1.

Procedure:-

Step 1:-

• Now select Properties option in Workflow.
• Then click Section Database option to view the Section available in the STAAD Pro itself.

• Then select Indian sections and click S Shape to choose ISMB 500 and ISMB 300.

• Choose ISMB 500 and click Add.
• Similalry Add ISMB 300 as shown below.

• Then select Channel section to choose ISMC 150 section and click add.

• Now select Angle section to choose ISA 120x120x10, ISA 110x110x12 and ISA 75x75x8 sections and click add.

• Now we have added all section required.

Step 2:-

• First select External Columns and Open in new View.
• Assign ISMB 500 section as shown below.

• External Columns are assigned as R1.

• Now Click Display whole Structure to view full structure again.

• Similarly select and create New View for Truss Members as shown below.
• And Select Top and Bottom cord.

• Now assign ISA 110x110x12 section.
• It is assigned as R5 as shown below.

• Similarly assign all Members by selecting right sections.

• Roof Frames are assigned as ISA 75x75x8 (R6).

• To select Purlin members easily, go to Select Tab and click Beams parallel to Z Axis.

• Purlin selected.
• Then assign the Section ISMC 150 as R3.

• Now select the and open the New view of Bottom Truss.
• Then select Beams parallel to Z Axis from Select Tab.

• Tie beams selected. Now assign ISA 120x120x10.
• It is assigned as R4.

• Now Select the Beams and open in the New view.

• Then select all primary beams and assign ISMB 300.

• Primary Beams are assigned as R2.
• Then select all secondary beams and assign ISMC 150 (R3).

• Now Select all Supporting columns and assign ISMB 300 as R2.

• Now we can see the sections assigned by choosing 3D Rendered Display.

Step 3:-

• To align Angle section in correct rotation.
• Select Beta Angle in Properties Window.
• Then click Create Beta Angle as shown below.

• Set angle as 45°.

• Then select the Angle sections and assign Beta Angle.

Step 4:-

• Go to Supports tools in Workflow.
• Then create the Fixed Support for External Column and Pinned Support for Inetrnal supporting Column.

• Then Select nodes and the Fixed Support
• And assign the support to external Columns.

• Again select the internal column nodes and assign Pinned Support.

Result:

• Specifications and Section properties assigned to the members successfully.

3. Creating a group exercise.

Form group for following members

• External column
• Internal columns
• Roof Frames
• Top chord of the Truss
• Primary Beams
• Secondary Beams

Aim:-

To create a group for the above members of created model in Question 1.

Procedure:-

Step 1:-

• Go to Utilities Tab, select Groups option.

• A new popup window opens.
• In that window, Type the name as External Column and select Type as Beam.

• Then select the External columns and Click Assoiciate.

• Then Click Create to add another group.
• Then do the same procedure.

• All members are grouped.

Step 2:-

• To check the Groups are associated well, click Highlight option as shown below.

External Columns

Internal Columns

Roof Frames

Top Cord

Primary Beams

Secondary Beams

Result:-

• All the members are grouped and highlighted successfully.