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Q: In the case of working stress method of design, the design load is :
  • A. The characteristic load
  • B. The characteristic load with appropriate partial safety factors
  • C. The characteristic load with appropriate factor of safety.
  • D. The greatest of (b) and (c) above.
Correct Answer: Option C - In the case of working stress method of design, the design load is the characteristic load only with appropriate factor of safety. Characteristic load is that value of load which has a 95% probability of not being exceeding during the life time of the structure.
C. In the case of working stress method of design, the design load is the characteristic load only with appropriate factor of safety. Characteristic load is that value of load which has a 95% probability of not being exceeding during the life time of the structure.

Explanations:

In the case of working stress method of design, the design load is the characteristic load only with appropriate factor of safety. Characteristic load is that value of load which has a 95% probability of not being exceeding during the life time of the structure.