基于等效线性地基的某工业厂房抗震分析

以某生命线工程工业厂房为例,采用等效线性化方法近似考虑地基的非线性特性进行厂房抗震分析,并将计算得到的楼层反应谱作为对比参数,与线性地基假定条件下抗震分析结果进行对比,结果表明:对于剪切波速较低的厂址(剪切波速小于400m/s),线性地基假定条件下厂房地震响应明显大于等效线性地基下的结果,而当地基剪切波速较高时(剪切波速约为1 100m/s),两者计算结果相近,分析结论可为今后建构筑物抗震设计提供参考。

SEISMIC ANALYSIS OF AN INDUSTRIAL PLANT BUILDING BASED ON EQUIVALENT LINEAR SOIL

The seismic analysis of an industrial plant building of lifeline engineering was performed under the condition of equivalent linear foundation.The floor response spectrum(FRS) obtained was compared to that obtained by analysis under linear foundation.The comparison shows that the seismic response under linear foundation is remarkably greater than that under equivalent linear foundation when the shear wave velocity of the soil is low(VS<400m/s);the two responses are close when the shear wave velocity of the soil is high(VS>1 100 m/s).The conclusion provides a reference for the seismic analysis of other buildings and structures in the furture.