Summary of changes and derivation of LRFD bolt design provisions

Technical changes proposed for the AISC LRFD Specification for Structural Steel Buildings are summarized. The changes include such areas as shear-tension interaction for high-strength bolts in bearing connections and clear-distance-based bolt bearing strength. A change is also proposed for the service-load slip resistance reduction factor for shear-tension interaction in slip-critical connections. A change made in 1993 AISC LRFD Specification Section J8.1 covering bearing strength of pins is documented and the supporting background information.