不同烈度区框架结构的易损性分析

Seismic Fragility Analysis of Frame Structure in Different Earthquake Intensity

以6度区、7度区、7.5度区、8度区、8.5度区接近规范限制高宽比和高度的框架结构,用严格按照规范规定轴压比、层间位移角、剪跨比等的下限值进行设计的5个算例,基于IDA的分析方法,比较5个烈度区结构的易损性,初步分析5个烈度区结构的抗震规定有效性的差异,分析结果显示规范对7.5度区结构的规定相较于其他4个烈度区的结构失效概率偏大,建议在对处于7.5度区的结构进行设计时宜取规范限值的偏保守值,处于6度区的结构可以采取规范限值的偏紧值。

In this paper, five models has been designed with a close value to the ratio of height to width, height,axial compression ratio, inter-story displacement rotation and shear-span ratio and so on applied to frame structures in the code. The models have been analyzed basing on an incremental dynamic analysis （IDA） in degree 6 region, degree 7 region, degree 7.5 region, degree 8 region, degree 8.5 region in order to verify the efficiency of the code. It came out that itg better to use the upper limit value in degree 7.5 region when designing the structure and it can use the lower limit value in degree 6 region.