考虑近断层地震运动特性的隔震结构抗震性能分析

Seismic Performance Analysis of Base-isolated Structure Considering the Movement Characteristics of Near-fault Ground Motion

基于近断层地震动的运动特性,选用破裂向前方向性脉冲型、滑冲效应脉冲型、无脉冲型共计30条地震波对一个6层基础隔震钢筋混凝土框架结构进行了IDA分析,以上部结构层间位移角和隔震支座的位移作为控制指标,给出了基础隔震RC框架结构的性能水准划分及量化指标限值。同时选用近断层上下盘地震动、断层法向平行向地震动对结构进一步进行IDA分析,得出结构易损性曲线,分析结果表现出地震激励下明显的上盘效应和方向性效应。为基础隔震钢筋混凝土框架结构的性能设计和易损性分析提供了参考依据。

Based on near-fauh earthquake of movement characteristics, choosing split forward directional pulse type, sliding rushed effect pulse type, and no pulse type amounted to 30 ground motion records, the incremental dynamic analysis （IDA） method is used to calculate the time history response of a base-isolated structure of 6 stories based on seismic motion characteristics. The peak inter-story drift ratio of super structure and the isolation bearing deformation are selected as structural performance index, a classification of performance level and the limits of quantitative index for base-isolated reinforced concrete frame structure are suggested. Moreover, choosing upper and foot wall ground motion records, near-fauh vertical and parallel ground motion records, the incremental dynamic analysis （IDA） method is used to calculate the time history response of the structure, the structural fragility curves are obtained, and the analysis results show the obvious hanging-wall effect and direction effect. It will facilitate the performance based design and fragility study of base-isolated RC frame structure.