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Q: As per IS:800-2007, the design tensile strength of a friction grip type bolt is equal to the nominal tensile strength of the bolt divided by the partial safety factor. If the tensile strength is calculated at ultimate load, the partial safety factor will be ________.
  • A. 1.1
  • B. 1.15
  • C. 1.25
  • D. 1.5
Correct Answer: Option C - Friction grip type bolt–In friction grip type bolting initial pretension in bolt (usually high strength) develops clamping force at the interfaces of elements that are joined. The friction resistance to slip between the plane surface subjected to clamping force opposes slip due to externally applied shear. Friction grip type bolt and nut shall conform to IS 3757. • Their installation procedures shall conform to IS 400 and partial safety factor will be 1.25.
C. Friction grip type bolt–In friction grip type bolting initial pretension in bolt (usually high strength) develops clamping force at the interfaces of elements that are joined. The friction resistance to slip between the plane surface subjected to clamping force opposes slip due to externally applied shear. Friction grip type bolt and nut shall conform to IS 3757. • Their installation procedures shall conform to IS 400 and partial safety factor will be 1.25.

Explanations:

Friction grip type bolt–In friction grip type bolting initial pretension in bolt (usually high strength) develops clamping force at the interfaces of elements that are joined. The friction resistance to slip between the plane surface subjected to clamping force opposes slip due to externally applied shear. Friction grip type bolt and nut shall conform to IS 3757. • Their installation procedures shall conform to IS 400 and partial safety factor will be 1.25.