Question

Which method is used to determine the collapse load in structural analysis?

• A. Working Stress Method
• B. Limit State Method
• C. Plastic Analysis Method
• D. Finite Element Method

Hint:

Remember: Collapse load → Plastic analysis (plastic hinges formation).

Answer 1

The Correct Option is C

Concept: Collapse load is the maximum load a structure can carry before failure.
Step 1: Understanding collapse load.
It corresponds to the formation of sufficient plastic hinges leading to a mechanism.
Step 2: Plastic analysis.
Plastic analysis is used to determine the ultimate load-carrying capacity of structures.
Step 3: Method description.
It assumes material yields and redistributes moments until collapse occurs.
Step 4: Evaluating the options.

• Working Stress Method $\rightarrow$ Based on elastic limits (incorrect)
• Limit State Method $\rightarrow$ Design approach, not direct collapse calculation (incorrect)
• Plastic Analysis Method $\rightarrow$ Determines collapse load (correct)
• Finite Element Method $\rightarrow$ General analysis tool (incorrect)

Step 5: Conclusion.
Thus, plastic analysis method is used to determine collapse load.