巨型框架结构基于增量动力分析法的抗震性能评估

Seismic performance assessment of mega-frame structures based on IDA method

详细介绍了增量动力分析方法的详细内容和分析步骤,采用工程中常用的最大层间位移角作为结构性能参数、地面峰值加速度作为地震动强度参数,通过对55层巨型框架结构进行IDA分析,得到该结构概率分位值为16%,50%和84%的IDA曲线及其对应的极限状态值,并用来评价巨型框架结构的抗震性能,为增量动力分析法在超高层结构中的应用提供参考。

The seismic performance such as deformation capacity and dynamic characteristics can also be obtained by IDA method.The paper introduce the basic principle and the basic steps of IDA at first,then apply IDA to a 55-story RC mega-frame structure,which used the maximum story drift as the structure performance parameters and the peak ground acceleration（PGA） as ground motion intensity measure,after statistical analysis,the limit-state capacities and different fractile such as 16%,50%,84% IDA curves can be obtained,at last use the result to evaluate the seismic performance of mega-frame structures.The result is helpful for a wide application of IDA in high-rise building.