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A streel beam (with a constant El, and span L) is fixed at both ends and carries a uniformly distributed load (w kN/m), which is gradually increased till the beam reaches the stage of plastic collapse (refer to the following figure). Assuming ‘B’ to be at mid-span, which of the following is true.
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- Hinges are formed at A, B and C together.
- Hinges are formed at B and then at A and C together.
- Hinges are formed at A and C together and then at B.
- Hinges are formed at A and C only.
Correct Option: C
Initially hinges will be at A and C. Then it becomes a simply supported beam. Then the plastic hinge will form at B.
