不同场地特征对高层建筑结构地震响应的影响

Influence of site characteristic on the structural seismic response of high-rise buildings

建筑结构在多遇地震下的响应通常通过反应谱分析得到。《建筑抗震设计规范》(GB 50011—2010)中给出的设计反应谱及设计地震分组和场地类别的规定使结构地震响应分析简单易行且具有很好的可靠性。选取两个结构体系不同的高层建筑结构模型,分析其在不同的设计地震分组和场地类别下结构地震响应的差异,评价不同场地特征对高层建筑结构地震响应的影响。结果表明,高层建筑结构的地震响应对场地特征有较大敏感性,且对场地类别的敏感程度比对设计地震分组的敏感程度高。

Seismic response under frequent earthquake is usually obtained by response spectrum analysis. With seismic response spectra, design earthquake group and site classification given in Code for seismic design of buildings（ GB 50011- 2010） , the analysis of structural seismic response is easier and more reliable. Two high-rise buildings with different structural systems were modeled to assess the influence of site characteristic on the structural seismic response. Response spectrum analysis with variation of design earthquake group and site classification was performed on the two building models. The results show that the seismic responses of high-rise buildings have a great sensitivity to the site characteristic, and the sensitivity to the site classification is even greater than that to the design earthquake group.