CVEN 3303 Steel Structures Term 1, 2025

Assignment 1 – Design of members subjected to axial loads

Figure 1: Sketch of steel support structure to be designed

Figure 1 illustrates a sketch of a proposed pin-jointed triangulated steel truss structure of dimensions L1 and L2 to support a given load P and Q.  You are required to design members, M1 (length = L1 ); and M2 (length = )

Assume:

•    All joints are pin-jointed

•    All nodes are assumed to be fixed from movement out-of-plane

•    All members have a mid-point restraint for buckling out-of-plane

•     Member M1 has a net area in tension of 0.85 Ag

Note:

•     Choose any steel sections allowable in AS4100

•     State any further assumptions

•    You do not need to design the connections, merely sketch them based on your chosen section

Design Parameters: Your student number is of the form. zABCDXYZ and the parameters for your design are given in Table 1.  For example, if your student number is z5412345, then the parameters for your design are given by your last student number Z as 5.

L1 = 4.Y m = 4.4 m

L2 = 4.X m = 4.3 m

P = 700 kN

Q = 750 kN

Table 1: Design Parameters

Marking Scheme

The following table provides the overall marking criteria for Assignment 1

1.   Calculate the member forces using principles of statics

2.   Determine the reactions using the principles of statics

3.   Design member, M1 using AS4100

4.   Determine the elongation of member M1 using mechanics of materials principles

5.   Design member, M2 using AS4100

6.   Provide sketches and drawings of the members and connections and how this would be constructed.  Please provide comments.  You do not need to design the connections, however provide sketches showing the

sections and scale of the members and connections. Provide comments on the design and optimisation.