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Which load is obtained when equilibrium and mechanism conditions of plastic analysis are satisfied?

(a) plastic limit load

(b) upper bound solution of true ultimate load

(c) lower bound solution of true ultimate load

(d) no solution

The question was asked in semester exam.

My doubt stems from Conditions of Plastic Analysis in chapter Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

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Correct option is (b) upper bound solution of true ultimate load

Easy explanation: When equilibrium and mechanism conditions of plastic analysis are satisfied, an upper bound solution of true ultimate load is obtained.

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