A_y-D_y格式地震需求谱及其在结构性能抗震设计中的应用

Inelastic seismic demand spectrum with A_y-D_y format and its application in performance based seismic design

在结构基于位移抗震设计的改进能力谱法基础上建议了屈服谱加速度和屈服位移(Ay-Dy)格式的地震需求谱,其特点是:过原点的射线与不同位移延性系数的需求谱曲线相交,各个交点对应的周期都相同,从而为在结构基于位移抗震设计方法中实现“小震不坏、中震可修和大震不倒”的多级性能目标提供了方便。借助于Pushover分析具体给出了一钢筋混凝土框架结构在不同风险水平地震作用下抗震性能评价实例。

Inelastic seismic demand spectrum with yield spectral acceleration-yield displacements format is introduced to the improved capacity spectrum method in order to consider multiple performance objectives in displacement based seismic design, because it has the advantage of that structural periods represented by radial lines intersecting demand spectra with different ductility factors are all the same. The multiple performance objectives are usually expressed as that designed structures can resist against minor earthquake without any damage, resist against moderate earthquake with repairable structural damage and resist against strong earthquake without collapse. Seismic performance evaluations of a RC frame using pushover analysis and capacity spectrum method under different earthquake design levels are illustrated as an example.