非结构构件抗震性能检测楼层反应谱

Floor response spectra for seismic performance tests of nonstructural components

为了确定加速度敏感型非结构构件振动台试验的输入,建立了用于非结构构件抗震性能检测的楼层反应谱,并开展了浮放输液架振动台试验验证该楼层反应谱的可用性.通过标准框架结构在不同地震强度下的弹塑性时程分析,确定非结构构件动力放大系数,基于分析结果建立了用于非结构构件抗震性能检测的楼层反应谱.利用该反应谱及其他现有检测楼层反应谱进行了浮放输液架的振动台试验,基于试验结果建立了不同输入下非结构构件的地震易损性曲线.提出的反应谱包括短周期段、上升段、平台段及下降段,平台段动力放大系数建议取值为3.0.试验结果表明,浮放输液架在0.3074g的加速度输入下,即有50%的概率达到或超过500 mm的残余位移.提出的楼层反应谱可为振动台试验确定台面输入,用于非结构构件抗震性能检测,促进加速度敏感型非结构构件的抗震性能研究.

To determine the inputs of shaking table tests for acceleration-sensitive nonstructural components(NSCs),floor acceleration response spectra(FRS)for shaking table tests on NSCs were developed.Shaking table tests were conducted on floating-type medical infusion racks to verify the applicability of the proposed FRS.Nonlinear time-history analyses of standard frame structures under different earthquake intensities were conducted to determine the dynamic amplification factors(DAFs)of NSCs.Furthermore,FRS for seismic performance tests of NSCs were developed based on this analysis results.Shaking table tests for medical infusion racks were conducted using the proposed FRS and those for NSC tests.Seismic fragility curves under different earthquake inputs were generated based on the shaking table test results.The proposed response spectrum comprises short period,linear increase,plateau,and decrease segments.The DAF for the plateau segment should be 3.0.The test results indicate that the medical infusion racks exhibit a 50%probability of reaching or exceeding a residual displacement of 500 mm under the acceleration input of 0.3074 g.Therefore,the proposed FRS can be used for determining the table inputs for shaking table tests for performing the seismic performance tests of NSCs,facilitating seismic performance research on acceleration-sensitive NSCs.