人字形中心支撑钢框架基于屈服点谱的性态抗震设计方法

Performance-based Seismic Design Method of Chevron Steel Braced Frames Using YPS

屈服点谱(Yield Point Spectra,YPS)是一种新的位移-加速度反应谱的表述形式。基于结构屈服位移的稳定性,根据性态目标得出延性限值,通过YPS结构屈服强度,采用能力方法设计了1榀人字形中心支撑钢框架结构,通过非线性静力分析和动力时程分析,结果表明运用屈服点谱对中心支撑钢框架进行性态设计具有可行性。

Yield point spectra （YPS） is a constant ductility response spectra with the yield displacementacceleration format, which is different from the elastic response spectra of Chinese code and the elastic-plastic displacement response spectra （ADRS spectra）. The spectra build the seismic demand curve of different ductility factor between Cy and improves the traditional methods, which can be convenient to the performance-based design and evaluation. Based on the stability of yield displacement, this paper estimates the allowable system displacement ductility according to the desired peak roof displacement. Using the simple graphical construction and the capacity design method to determine sectional dimension constraints on strength and stiffness, the paper designs a plane Chevron steel braced frames, the nonlinear static analyses and nonlinear dynamic analyses were used for verification purposes. Results indicate that the yield point spectrum method on Chevron steel braced frames design is feasible.