场地地震反应分析研究现状及展望?

场地条件对结构震害的影响已成公认的事实,如何定量的进行场地地震反应分析成为地震工程学中亟待解决的问题之一,而在场地地震反应分析中确定地震动输入至关重要。针对场地条件和地震动输入对场地地震反应的具体影响、场地地震反应分析方法等方面的研究现状进行了系统总结。已有研究表明,场地条件和地震动输入对场地地震反应分析结果有显著影响。但目前仍存在的问题有:在冻土区进行场地地震反应分析时未充分考虑冻土层的影响效应;缺乏合理的地震动模型来准确描述实际地震动;尚未明确地震波入射角度对场地地震反应的影响规律;目前广泛使用的等效线性化方法不能完全反应土体在地震动作用下的真实运动状态而使其计算结果不尽合理。结合以上问题对还需进一步研究的内容进行了展望,为场地地震反应分析未来的研究工作提供参考。

Present Research Situation and Prospect on Analysis of Site Seismic Response

The influence of site conditions on structural seismic damage has become a well-known fact.How to conduct quantitative analysis of site seismic response has become one of the urgent problems to be solved in seismic engineering.This paper gives a summary of the research status of the site conditions and the influence of ground motion input on the site seismic response and the analysis methods of the site seismic response.It is shown that site conditions and ground motion input have a significant impact on analytical results of site seismic response.However,there are still some problems:The effects of the frozen soil layer are not fully considered when the site seismic response analysis is carried out in the frozen soil areas;there is no reasonable ground motion model to describe the actual ground motion accurately;the influence law of incident angle of seismic wave on seismic response of site has not been clarified;the widely used equivalent linearization method cannot fully reflect the real motion state of soil mass under the action of ground motion,so its calculation results are not reasonable.Combined with the above problems,the further research contents are prospected,which provide reference for the future research of site seismic response analysis.