Response modification factor for Y-eccentric-braced steel frame structures designed based on Chinese Code

摘要

In current seismic design procedure, structure base shear is calculated according to the linear elastic response spectra divided by the response modification factor, which accounts for ductility and over-strength of a structural system. In this paper, the response modification factors of Y-eccentric braced steel frames (YECBF)designed based on Chinese Code were evaluated by an improved pushover analysis on 12 examples with various stories and spans lengths. According to the analysis results, the effects of fundamental periods, storey numbers, and spans of frames on the behavior factor were studied. In the end, an appropriate response modification factor was proposed for YECBF designed base on Chinese Code.