Effect of the Brace Design Method on the Seismic Response of Chevron Braced Frames

摘要

This paper examines two different brace design methods for four- and ten-story chevron braced frames. The first method is in accordance with the current seimic design code GB50011. In the other method, the compression reduction factor ψ under cyclic load is not considered in the brace design. The dynamic analysis results of the chevron braced frames reveal that, under frequent and rare earthquake excitations, the aseismic performance for the the structures, in which the braces are designed with considering the reduction factor ψ, is slightly better than that for the structures, in which the braces are designed without considering the reduction factor ψ. However, all structures were operational with no damage under frequent earthquakes and were not collapse under rare earthquakes. And no brace appeared fracture under rare earthquakes. These phenomena verified that the brace designed by the GB50011 code is conservative and the compression reduction factor ψ under cyclic load is not needed in the brace design.