Story Shear Distribution And Its Influence Factors Of Diagonal Lined Centrically Braced Steel Frame Under Severe Earthquakes

The current seismic code based on the strength of the elastic design method, thelateral force distribution pattern are proposed according to the elastic structure dynamictime history analysis, and structure will enter elastic-plastic state under severe earthquake,Performance based seismic design need the story shear distribution in elastic-plastic state.Five of diagonal-lined CBSF structures with ideal yield mechanism were designed,The story shear distribution of DL-CBSFs under two kinds of earthquake records wereobtained through nonlinear time history method. The effects of near-field earthquake、far-field earthquake、earthquake acceleration amplitude、story number、structural span andspan number on the story shear distribution were analyzed in this paper. The formula ofstory shear of DL-CBSF was proposed.