Question

A structure has two degrees of indeterminacy. The number of plastic hinges that would be formed at complete collapse is .......

• A. 0
• B. 1
• C. 2
• D. 3

Hint:

In structural analysis, the number of plastic hinges required for complete collapse can often be determined by the degree of indeterminacy of the structure. Remember, it's \( n + 1 \).

Answer 1

The Correct Option is D

For a structure with \( n \) degrees of indeterminacy, the number of plastic hinges formed at complete collapse is equal to the degrees of indeterminacy plus 1. This is based on the general plastic collapse theory for structures. 
Given that the structure has 2 degrees of indeterminacy: \[ \text{Number of plastic hinges} = n + 1 = 2 + 1 = 3 \] Thus, the number of plastic hinges is 3.