Bracing System - Different Assessment Answer

Assignment Task :

A new car display centre is to be built at your local area using a steel frame. The plan and cross section of the structure is shown in Figure 1. 

The centre is to be designed as a steel framed building on reinforced concrete floor using prefabricated steel trusses, supported on columns. The overall dimensions of the centre are shown in Figure 1. The sides of the display centre are cladded with tempered glass attached to the frame. Wind direction is North-South 

The frames and its members are to be connected by a suitable bracing system. Details of suitable bracing systems for wind and stability are to be determined by you, the designer. The roofing and wall cladding are to be supported using steel purlins and girts and all are to be specified by you. The equal panel length of the truss is 2.5 m and height of the truss is 1m. 

As part of your design assignment you, the designer, are required to calculate: 

1. Loads and Load Combinations:  

Determine the loads to be applied to the structure: 

(i) Permanent load: 

a) Self-weight: This based on the sections chosen. Details of load per metre length can be obtained from the manufacturer’s specification, see OneSteel.com. Please note that Microstran also has a database of sections to choose from.

b) Cladding: see AS1170.1 for the self-weight of different construction materials

c) Bracing System: based on the chosen sections.

(ii) Imposed Load: 

The magnitude of live load is defined in AS1170.1. (iii) Wind Load: 

The wind load is determined using AS1170.2 and Lecture 3. Please note that the determination of wind load requires a location to be chosen as wind loads are location specific. Therefore, determination of wind loads should be based on the site where your car display centre is to be built. Use the wind load to determine the bracing system. 

2. Analysis and Analysis Results:   

(a) Input your truss-column system model into Microstran to determine the actions effects. Input the bracing system into Microstran to determine the action effects.

(b) Define the different loads (permanent, imposed and wind).

(c) Define the different load combinations 

(d) Analyse the structure and determine critical design loads for each member and determine the resulting design loads on the structure from all causes by considering the appropriate load factors and load combinations for: 

(i) The members supporting the roof sheeting (purlins) and the wall sheeting (girts);

(ii) The truss members (top chord, bottom chord, diagonal members, vertical members)

(iii) Columns

(iv) The bracing members resisting wind forces.

(e) Determine the values of axial force (compression and or tension), shear, and bending moment (N*, V* and M*) in each type of member of the structure resulting from the critical load cases and determine the maximum values of these actions to be used in the member design.

(f) Use sketches in conjunction with your calculations to enable the marker to visualise your design process. A series of calculations on their own without sketches can be difficult to comprehend. 

3. Member Sizing:  

Determine suitable sizes for the following members: 

(i) Top and bottom chords

(ii) Vertical and diagonal web members

(iii) Columns

(iv) The purlins and girts and

(v) Bracing system. 

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