为研究高层RC框架核心筒结构的地震易损性,设计9榀相同层高但不同跨度和地震设防烈度的典型结构模型,考虑地震动输入的不确定性,采用Perform-3D对其进行弹塑性动力时程分析得到结构地震响应,进而结合我国抗震规范对框架核心筒结构体系性能水平限值要求建立相应的地震易损性曲线,对比分析了不同跨度和设防烈度下结构的地震易损性差异。结果表明:较低设防烈度结构的地震易损性曲线差别不明显,而较高抗震设防烈度下结构的地震易损性曲线差别显著;在相同设防烈度下,随着结构跨度的增加其地震易损性曲线变化不大,从一个方面验证了结构设计的不确定性对其地震易损性的影响较小。研究为进行城市高层建筑结构的地震灾害损失评估提供了理论依据。
Abstract
In order to establish fragility curves of high-rise RC frame-core wall structures, nine typical RC frame-core wall structures with uniform story height, different spans and earthquake fortification intensity are designed and numerically modelled. Considering the randomness of earthquake ground motions input, seismic response is obtained through nonlinear dynamic time history analysis adopting Perform-3D as the finite element software. Ultimate damage states for entire structures are defined on the basis of current seismic design code so as to the construction of fragility functions. The influence of the structural span and seismic fortification intensity are analyzed. The results show that: low seismic fortification intensity makes no apparent effect on the structure vulnerability curve, while with the increasing of the intensity the variable getting obviously; Although the span is diverse, the fragility curves are similar under the same seismic fortification intensity, which indicates the design uncertainties contribute small to the variability in structural response. Then the fragility curves of this kind of structures are derived, which can provide a reference for seismic loss estimation of city high-rise buildings.
关键词
高层RC框架核心筒结构 /
易损性曲线 /
地震动输入 /
结构设计
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Key words
high-rise RC frame-core wall structures /
vulnerability curve /
input of earthquake ground motion /
structural design
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