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

Step 1: Understanding the Concept:
The collapse load is the maximum load a structure can sustain just before it forms a mechanism and fails completely.
Step 2: Detailed Explanation:
1. Working Stress Method: Based on linear elastic behavior; ignores the reserve strength after the yield point.
2. Plastic Analysis Method: Specifically examines the state where plastic hinges form. It calculates the load required to transform the structure into a kinematic mechanism (failure).
3. Limit State Method: A design philosophy that includes both safety and serviceability but relies on plastic theory for ultimate strength.
4. Finite Element Method: A computational tool for stress analysis, but the theoretical framework for "collapse load" is Plastic Analysis.
Step 3: Final Answer:
Plastic Analysis Method is used to determine the collapse load.