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Multi-span beams collapse in one span as ___________(a) does not collapse(b) single-bar mechanism(c) two-bar mechanism(d) three-bar mechanismThe question was posed to me during an internship interview.I'm obligated to ask this question of Plastic-Collapse Load topic in chapter Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

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The correct OPTION is (c) two-bar mechanism

To explain I would say: Multi-span beams generally COLLAPSE in one span as a local two-bar mechanism, WITHIN the span and a hinge at each support. It is possible to have a three-bar mechanism, where two adjacent spans COMBINE to form a mechanism.



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