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Question
Which of the following statements is /are correct?
1. Plastic hinges are reached first at sections subjected to greatest curvature.
2. Formation of plastic hinges allows a subsequent redistribution of moment until fully plastic moment is reached at each critical section.
3. The maximum load is attained when a mechanism forms. 
A.
1, 2 and 3
B.
1 and 2
C.
1 and 3
D.
2 and 3
Answer ( Option A)

1, 2 and 3

Solution

Plastic hinges are reached first at sections subjected to greatest curvature. After the formation of plastic hinge this section continue to rotate, offering at the same time a resistance equal to Mp, any further increase in load causes redistribution of moment until fully plastic moment is reached at each critical section. Mechanism is a situation in which sufficient number of plastic hinges are developed so as to cause the collapse of the structure without any further increase in load. Hence, the maximum load is attained when a mechanism forms.

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