Question

The presence of axial equation implies that _________

(a) sum of tension forces is always zero

(b) sum of compression forces is always zero

(c) sum of tension and compression forces is not zero

(d) sum of tension and compression forces is zero

This question was posed to me in an internship interview.

I would like to ask this question from Plastic Design of Portal Frames, Effect of Axial and Shear force on Plastic Moment Capacity in chapter Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

Answer 1

The correct choice is (c) sum of tension and compression forces is not zero

The best I can explain: The presence of axial equation implies that sum of tension and compression forces is not zero and hence following equation is used : ∫A  fydA – P = 0, where P is the axial force.