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What is plastic-collapse load?

(a) load at which sufficient number of elastic hinges are formed

(b) load at which sufficient number of plastic hinges are not formed

(c) load at which sufficient number of plastic hinges are formed

(d) load at which structure fails

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My question is from Plastic-Collapse Load in portion Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

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Right option is (c) load at which sufficient number of plastic hinges are formed

The explanation: The load at which sufficient number of plastic hinges are formed in a structure such that a collapse mechanism is created is called plastic-collapse load or plastic-limit load.

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