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天津市区的场地条件为很厚而松软的第四纪沉积物,覆盖层较厚,地貌属海积—冲积平原,对地震动参数的影响很大。本文以海河东岸的天津嘉里中心工程场地为例,通过场地地震动效应分析,研究场地特征对地震动的影响。结果表明,土层地震反应分析得到的地震动峰值和反应谱与GB50011-2001《建筑抗震设计规范》的规定有明显的差别,抗震设计中的根据场地类别调整地震动的方法不足以完全描述场地地震反应特性,也难以反映天津厚软土场地的实际情况。可以认为,对于天津软土场地,采用经场地土层地震动效应分析所得地震动参数更为合理安全。
The site conditions in Tianjin area are very thick and soft Quaternary sediments, with thick cover and topographic features of sea-alluvial plain, which have a great influence on the ground motion parameters. Taking the construction site of Tianjin Kerry Center on the east coast of Haihe River as an example, the paper studies the effect of site characteristics on ground motion through the analysis of ground motion effects. The results show that the seismic peak response spectrum and response spectrum obtained from the seismic response analysis of soil are obviously different from those of GB50011-2001 Code for Seismic Design of Buildings. The method of adjusting ground motion according to the type of site in the seismic design is not enough to fully describe the site Earthquake response characteristics, it is difficult to reflect the actual situation of thick and soft place in Tianjin. It can be considered that for the Tianjin soft soil area, it is more reasonable and safe to adopt the ground motion parameters obtained from the ground motion effect analysis of the ground.