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基础隔震结构的近断层脉冲型地震作用与常规地震作用相比,结构的最大绝对加速度、隔震层的最大位移均有较大增加。通过算例分析,采用时程分析法对近断层脉冲型地震作用的隔震结构计算时,罕遇地震下的峰值加速度的取值决定了隔震支座的选择。通过对《建筑抗震设计规范》(GB 50011—2010)12章及附录L简化计算方法的分析,三种罕遇地震峰值加速度取值对应三种隔震支座布置的计算结果,8度区多层框架结构,建议采用插值法进行罕遇地震下隔震层计算,隔震层以上结构的水平地震影响系数最大值,抗规公式(12.2.5)应乘以近场影响系数。
Near-fault impulsive earthquake action of the base-isolated structure Compared with the conventional seismic action, the maximum absolute acceleration of the structure and the maximum displacement of the seismic isolation layer all increase greatly. Through the example analysis, the time-history analysis method is used to calculate the isolation structure of near-fault impulsive earthquake. The value of peak acceleration under rare earthquakes determines the choice of isolation bearings. Based on the analysis of simplified calculation method of Code for Design of Seismic Design of Buildings (GB 50011-2010) and Appendix L, the calculation results of three kinds of rare earthquakes peak acceleration correspond to the arrangement of three kinds of isolation bearings. It is recommended to use the interpolation method to calculate the seismic isolation under rare earthquakes. The maximum horizontal seismic influence coefficient of the above structure above the seismic isolation layer should be multiplied by the near-field influence coefficient (12.2.5).