The Analysis On Mechanics Performance Of The Steel Frame's Reduced Beam Section Connections

During the 1994 Northridge and 1995 Kobe earthquake, the typical beam-column connections in steel moment-resisting frame suffered brittle failures. Atfer 1994 Northridge earthquake and 1995 Kobe earthquake many studies on the behavior of beam-column connections used in steel moment resisting frame and their effect on seismic behvaior of steel frames have been carried out.Reduced beam-column connections are one kind of these new style connections,the familiar style include the Weakend web and the Reduced beam section .These new styles connections in order to make the plastic hinge moved out wothout reducing carrying capacity of beam-column connections obviously,and to protect the brittle connection area.then the ductility of the connections can be improved and the ductile design on steel frame can be realized.This paper use big finite element program to analyse many models with different parameters of the two types reduced beam-column connections.The aim is to know every parameter how to influence connections carrying capacity and the hysteresis behavior. Throngh the research and analisis the paper give the reasonable parameters of the two types redueed connections.Through this paper's research,we can get some conclusions:through reasonablly reducing the two type reduced connections can make the plastic hinge move out to protect the brittle connections'area and can without reducing the carrying capacity,seismic behavior obviously,the ductility of connections can be improved.