设防区划调整对多层框架结构抗震性能影响的研究

Study on the influence of the seismic ground zonation map adjustment on the seismic performance of the multistory frame structure

基于IDA方法研究了抗震设防区划调整对既有框架结构建筑抗震性能的影响。在对新版地震区划图变更特点统计分析的基础上,按照不同设防标准设计了5个3跨6层框架结构模型,并利用30条地震波对上述模型进行了IDA分析,给出了相应的易损性曲线;参考ATC-63报告中大震下倒塌率不超过10%为评价结构满足抗震设防目标的依据,分别对设防区划不同调整区段内框架结构的抗震性能进行了讨论。结果表明,原7.5度、8度设防区升一档的城镇以及原设防区升两档、升三挡的城镇不满足新版抗震区划设防目标要求,是今后城市抗震防灾需重点关注的内容。

The impact of seismic zoning adjustment on seismic performance of existing frame structures is studied based on IDA method.Based on the statistical analysis of the change characteristics of the new version of seismic zoning map,five 3-span 6-storey frame structure models are designed according to different fortification standards.According to the ATC-63 report,in order to evaluate whether the structure meets the seismic fortification target,the influence of different adjustment sections of the fortification zone on the seismic performance of the structure is discussed.The results show that the cities and towns with the original 7.5 degree and 8 degree fortification zones upgraded by one level and those with the original 7.5 degree and 8 degree fortification zones upgraded by two level and three level do not meet the requirements of the fortification objectives of the new seismic zoning,which is the focus of the future urban seismic disaster prevention.