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Q: When assessing the strength of a structure for the limit state of collapse, the value of partial safety factor should be taken as.....for concrete.
  • A. 1.2
  • B. 1.3
  • C. 1.4
  • D. 1.5
Correct Answer: Option D - Partial safety factor for concrete is 1.5 and for steel is 1.15. The partial safety coefficient of the concrete is kept higher than steel because production of concrete is carried out in the open area and its strength is affected due to many reasons while steel is made under controlled conditions in a steel factory. The partial safety factor of the concrete is kept higher than steel because concrete is not a pure homogeneous but steel is homogeneous material.
D. Partial safety factor for concrete is 1.5 and for steel is 1.15. The partial safety coefficient of the concrete is kept higher than steel because production of concrete is carried out in the open area and its strength is affected due to many reasons while steel is made under controlled conditions in a steel factory. The partial safety factor of the concrete is kept higher than steel because concrete is not a pure homogeneous but steel is homogeneous material.

Explanations:

Partial safety factor for concrete is 1.5 and for steel is 1.15. The partial safety coefficient of the concrete is kept higher than steel because production of concrete is carried out in the open area and its strength is affected due to many reasons while steel is made under controlled conditions in a steel factory. The partial safety factor of the concrete is kept higher than steel because concrete is not a pure homogeneous but steel is homogeneous material.