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Q: Identify the INCORRECT statement with respect to specifications on the partial safety factors for material strength, and are used in limit state design of RC structures
  • A. A partial safety factor ‘1.15’ is used for steel under serviceability limit state
  • B. A partial safety factor 1.5 is used for concrete under ultimate limit state
  • C. A partial safety factor ‘1’ is used for concrete under serviceability limit state
  • D. A higher partial safety factor has been assigned to concrete compared with reinforcing steel under the ultimate limit state.
Correct Answer: Option A - When assessing the strength of a structure or structural method for the limit state of collapse, the value of partial safety factor, m should be taken as 1.5 for concrete and 1.15 for steel. • A partial safety factor 1 is used for concrete under limit state of serviceability. • A higher partial safety factor has been assigned to concrete with reinforcing steel under the ultimate limit state.
A. When assessing the strength of a structure or structural method for the limit state of collapse, the value of partial safety factor, m should be taken as 1.5 for concrete and 1.15 for steel. • A partial safety factor 1 is used for concrete under limit state of serviceability. • A higher partial safety factor has been assigned to concrete with reinforcing steel under the ultimate limit state.

Explanations:

When assessing the strength of a structure or structural method for the limit state of collapse, the value of partial safety factor, m should be taken as 1.5 for concrete and 1.15 for steel. • A partial safety factor 1 is used for concrete under limit state of serviceability. • A higher partial safety factor has been assigned to concrete with reinforcing steel under the ultimate limit state.