Steel Structure Design - Engineering

Q1:

Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed

A 40

B 50

C 60

D 90

ANS:A - 40

Yeah its the tracking rivets and either its 40 or 0.6 times the most unfavorable slenderness ratio of the strut as a whole.