考虑地震动频谱成分的高层结构易损性初步研究

Preliminary study on vulnerability of highrise buildings considering spectrum of ground motion

历次震害表明,地震动的频谱特征与高层建筑的破坏程度密切相关。但在此前的高层建筑易损性曲线的相关研究中,并没有考虑地震动频谱特征对于易损性曲线的影响。为建立考虑频谱特征的易损性曲线,在分析已有震害案例的基础上,计算分析了两栋实际高层结构在695种工况下的时程反应,利用多因素方差分析和联合分析定量分析了地震动特征周期对高层建筑破坏的影响,并初步建立了层数约为20层的高层结构考虑地震动特征周期的结构易损性曲线,为其他高层结构易损性研究提供参考。

The damages caused by past earthquakes indicate that the spectral characteristics of ground motions are relevant closely to the damage of highrise buildings. While in previous studies on vulnerability curves of highrise buildings,it is not considered that the ground motion spectrums have effects on vulnerability curves. To construct a vulnerability model considering the effect of spectrum,based on analysis of existent seismic damages,two models of real highrise buildings as examples were built to perform time-history analysis under 695 cases. The variance analysis and the conjoint analysis were applied to analyze quantitatively the effect of characteristic period of ground motion on seismic damages of highrise buildings. And the vulnerability curves of 20-stories buildings considering the effect of ground motion spectrums are built to give a reference to later research.