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Assignment Task :

Project Brief 

A new industrial building is to be constructed at 192 Bowhill Road, Willawong, Brisbane (please use Google map as reference), Queensland, as shown on the attached drawings, Figures 1 and 2. Refer to the North direction in Fig. 2. The building will be made of structural steel pitched portal frames. All the joints of the portal frame are rigid connections. The connections between the columns and the footings are pinned (bolted). 

The sidewalls and the roofs of the building are covered with metal sheeting. The metal sheeting sits on purlins on roof and sits on girts on side walls. The roof sheeting will be fixed to steel purlins running along the length of the building (east-west). Purlins will be attached to the top flange of the roof beams and hence, would provide lateral restraint to the top flange of these beams. Similarly, girts attached to the outer flange of columns would provide lateral restraint to columns. 

There are typical glazed windows (L = 2000 mm, H = 1000 mm, 20 mm thick) between A-B, C-D and E-F grids along grid 1 and on alternate bays (B-C, D-E and F-G) along grid 2, at an elevation of 1500 mm above the floor. Assume that the windows will be centrally placed between 2 grid lines. There are 2 rolling shutters of 1220 mm wide and 2200 mm high along grids A and G. The floor is made of reinforced concrete. Assume that lateral bracing systems along grids 1 and 2 would carry the wind loading in the longitudinal direction. You do not need to design the bracing system. Because of the bracing system in place, the columns have pinned connections at the top in the longitudinal direction. On the other hand, the portal frames will carry the wind loading in the transverse direction. 

• Take appropriate values of X, Y and Z from Table 1 depending on the last two digits of your Student ID number. Assume appropriate realistic values for other design data that are not provided. 

• Use appropriate standards (AS1170.0 2002, 1170.1 2002 and 1170.2 2011 R2016) for the estimation of loads and AS4100 1998 using One Steel of Grade 300 for steel design. 

• Use linear elastic analysis and limit state design 

• Ignore secondary effects. 

CIV4508 Assignment 2 1 | Page 

2. Problem statement 

Q1. Load estimation

a) Calculate the loads (DL +LL) acting on a typical portal frame.

b) Calculate the wind loads (WL) acting on a typical frame.

Assume no shielding, Ms = 1.0. Only consider the Northerly and Westerly wind directions. Determine the followings: 

• Design wind speed 

• Design pressures and Cfig for external surfaces: windward, leeward, sidewalls and roof, assuming Ka = 1, α = 10o 

• Design pressures and Cfig for internal surfaces which may give the worst uplifted case for the roof 

• Determine the worst uplift load for the roof and the worst load for the columns. 

 

Q2. Purlin Design (20 marks) The roof sheeting will be fixed to steel purlins running along the length of the building (east-west).

a) Select purlin spacing to suit sheeting and geometry

b) Determine design loads and select purlin from tables Use the same purlin section for girts, no separate design is required. 

Q3. Analyse the portal frame using Strand7 Analyse the portal frame for appropriate loading combinations for strength and serviceability considerations using Strand7. Display the model  bending moment  shear force and axial force diagrams and deflected shapesof the frame. You need to show which model you have used, how you come up with the loading, boundary conditions etc. Please only report the relevant plots, no need to show all of them unnecessarily. 

Q4. Roof Beam design Design a typical roof beam (RC1) on Grid C for strength and serviceability requirements. Use One Steel 300 grade Universal Beam sections. 

 

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