THE EFFECT OF YIELD-TO-ULTIMATE RATIO ON THE BOLTED CONNECTION UNDER STATIC SHEAR

摘要

Eurocode 3 Annex D allows the use of high strength steel. But there are no special conditions or restrictions for bolted connections for high strength steel in Annex D. Especially there are significantly fewer investigations on the influence of end distance, edge distance or bolt spacing on the bearing resistance of high strength steel in comparison to other grades. Ductility degradation due to the increase of yield-to-ultimate ratio makes a dent in bolted connection under static shear, which limited the application of high strength steel. The paper summarized experimental research on bolted connection under static shear of different strength grade steel, and the effect of yield-to-ultimate ratio on bolted connection was analyzed. It was found that for a particular type of fastened the variation in shear strength caused by the type of connected material was usually very small. The reduction in bearing resistance for small e2 or p2 didn't need to be so large. The design resistance according to yielding of the gross cross-section was critical for mild steel, to prevent large member elongation. But for high strength steel, the design resistance given by rupture of the net area was critical because the tensile resistance of the net section was reached before the yielding of the gross area.