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Virtual work is used to determine _____

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Virtual work is used to determine _____

(a) yield load

(b) elastic load

(c) plastic load

(d) collapse load

This question was posed to me at a job interview.

My enquiry is from Conditions of Plastic Analysis in section Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

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The correct choice is (d) collapse load

Easiest explanation: Virtual work principle is used to determine collapse load. It is the application of principle of least action to study forces and movement of a system.

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