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Proof stress for minimum bolt tension is :

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in Design of Steel Structures by (962k points)
Proof stress for minimum bolt tension is :

(a) 0.7fub

(b) 0.5fub

(c) 0.7fyb

(d) 0.5fyb

The question was asked in an interview for job.

My question comes from Bolted Connections topic in division Bolted Connections of Design of Steel Structures

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Right option is (a) 0.7fub

Easy explanation: Proof stress for minimum bolt tension is 0.7fub, where fub= ultimate tensile stress of bolt. Proof stress is an approximation for yield point for materials which do not have a definite one because of their structure.

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