Question

Which of the following is true about built up section?

(a) Built up members are less rigid than single rolled section

(b) Single rolled section are formed to meet required area which cannot be provided by built up members

(c) Built up members can be made sufficiently stiff

(d) Built up sections are not desirable when stress reversal occurs

This question was addressed to me in a job interview.

I need to ask this question from Tension Members and their Types in division Design of Tension Members of Design of Steel Structures

Answer 1

The correct answer is (c) Built up members can be made sufficiently stiff

The best explanation: Built-up members, made up of two or more plates or shapes and connected to act as single member, are formed primarily to meet required area which cannot be provided by single rolled section. Built up members are more rigid because for same area much greater moment of inertia can be obtained than single rolled section. Built up members can be made sufficiently stiff to carry compression and tension thus desirable when stress reversal occurs.