Week 9 Challenge

1)

AIM:

To design a 3 hinged pitched roof frame of a steel building.

PROCEDURE :

• Open a new Staad file.
• Make the outline of the roof frame by creating nodes at coordinates respective to the give lengths and then add beams connecting them.

• Now, add pinned supports to columns at the bottoms.
• Go to Supports tab, click on create to add pinned support.

• Create the pinned support and click on add.

• Now, add internal hinges at the joints of the roof, this can be done by clicking on Moment release in the frame.

• Now, assign the Section property to the Columns and rafter. I have alloted ISMB 500 to Columns and ISMB 300 to Rafters.

• Now, as per the given data:

• Dead Load = Self Weight + Weight of Purlin + Weight of tertiary members + Weight of Roofing Sheets

  Total Dead Load = Self Weight + [(25+ 5) `(kg)/m^2` x 5 m] = 150 `(kg)/m` = Self Weight + 1.5306 kN/m

  Live Load = [75 `(kg)/m^2` x 5 m] = 375 kg/m = 0.375 kN

• Apply the load on the roof frame.

• Do the analysis to create Shear Force Diagram, Bending Moment Diagram and Axial Force Diagram.

Shear Force Diagram:

Bending Moment Diagram:

Axial Force Diagram:

Result:

Bending Moment Diagram, Shear Force Diagram and Axial Force Diagrams of the pitched roof frame are obtained successfully.

2)

Aim:

To draw Bending Moment Diagram for the following cases using staad pro:

FIGURE 1 :

FIGURE 2:

FIGURE 3:

Procedure:

• Open new Staad File.
• Draw the basic frame structure creating nodes and then add beams connecting them, use concept of Moment Release to add internal hinge in between the beam.

• Now, we will add the supports to the basic frame and internal hinge in the third frame as shown in the figures in the question.

• Now we will apply respective loads on the Frames as given.

• Now, apply the section properties as we did earlier and run the analysis.
• After running the analysis, Bending Moment Diagram obtained from the post processig mode for the given cases are as shown below.

Result:

Bending Moment Diagram for the given following cases has been obtained succcesfully using STAAD.PRO.

3)

Aim:

To determine the following deflections using staad pro:

1. Determine the lateral deflection at point A & Vertical deflection at mid section of beam between B & C from Figure 1 in previous challenge.
2. Determine the lateral deflection at point A & Vertical deflection at mid section of beam between A & B from Figure 2 in previous challenge.
3. Determine the lateral deflection at point A & point B from Figure 3 in previous challenge.

Procedure:

• Open the previous staad file we are working on.
• Continue working on it following the below steps
• After running the analysis, go to post processing mode.
• Click on Deflection to view the deflected shape of the respective frames.

• Go to Annotate option and check the box to view the numerical value of deflection at node points.

• LATERAL DEFLECTION FOR FIG 1:

Lateral Displaccement of A = 0.030mm

Vertical Displacement of B = -1.093 mm

Vertical Displacement of C = -0.409 mm

• LATERAL DEFLECTION FOR FIG 2:

Lateral Deflection of Point A = 427.738 mm

Maximum Deflection of Beam between A and B = 434.366 mm

• LATERAL DEFLECTION FOR FIG 3:

Lateral Deflection of Point A = 31.015 mm

Lateral Deflection of Point B = 30.989 mm.

Result:

Deflection of the points and the beams for the given cases has been obtained successfully.