The fully stressed design is often used for truss structures. The idea is that we should remove material from members that are not fully stressed unless prevented by minimum crosssectional area constraint. Practically, at every design cycle, the new cross sectional area can be found using the following relation:

A tenbar truss structure shown in figure 1.32 is under two loads, \(P_{1}\) and \(P_{2}\). The design goal is to minimize the weight, \(W\), by varying the crosssectional areas, \(A_{i}\), of the truss members. The stress of the member should be less than the allowable stress with the safety factor. For manufacturing reasons, the crosssectional areas should be greater than the minimum value. Input data are summarized in the table. Find optimum design using a fully stressed design.

Transcribed Image Text:

Ae (e) Pold new (e) 4(e) old- allowable