地震动频谱特性对基础隔震结构双向地震响应的影响
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摘要
为掌握地震动频谱特性对基础隔震结构双向地震响应的影响,采用地震动峰值加速度与峰值速度的比值(PGA/PGV)代表频谱特性,选取9条不同频谱特性的地震波,对铅芯叠层橡胶基础隔震结构进行了双向地震响应非线性时程分析,基于PGA/PGV值的变化来分析地震动频谱特性对基础隔震结构双向地震反应分析结果的影响。分析结果表明:随PGA/PGV增大,加速度减震率整体上呈增大趋势;隔震层位移、剪力均随PGA/PGV增大而减小,并逐渐终趋于平缓。此外,频谱特性对结构地震响应的的影响,还受结构自振周期的影响,应综合考虑。
In order to study effects of ground motion characteristics on the performance of base-isolated structures,9 earthquake waves of different spectra based on ratios of peak ground acceleration to peak ground velocity(PGA/PGV) are selected.Bilateral seismic responses of a base-isolated structure with lead rubber bearings are conducted using non-linear time-history analysis method.The seismic responses of base-isolated structures under different ground motions are discussed.It is found that the decreasing amplitude ratio of isolated layer overall increases with increasing of PGA/PGV,the displacement and shear force of isolated layer decrease with increasing PGA/PGV and tend to stable.Moreover,effect of ground motions on structural seismic responses are influenced by natural vibration period,which should be considered as well.
In order to study effects of ground motion characteristics on the performance of base-isolated structures,9 earthquake waves of different spectra based on ratios of peak ground acceleration to peak ground velocity(PGA/PGV) are selected.Bilateral seismic responses of a base-isolated structure with lead rubber bearings are conducted using non-linear time-history analysis method.The seismic responses of base-isolated structures under different ground motions are discussed.It is found that the decreasing amplitude ratio of isolated layer overall increases with increasing of PGA/PGV,the displacement and shear force of isolated layer decrease with increasing PGA/PGV and tend to stable.Moreover,effect of ground motions on structural seismic responses are influenced by natural vibration period,which should be considered as well.
引文
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