偏心隔震结构随机响应分析

Analysis of random response of eccentric vibration-isolative structures

利用过滤白噪声地震动模型,应用虚拟激励法对单向偏心隔震结构进行了随机响应分析.通过等效线性化的方法,对基础隔震支座的非线性模型进行了等效线性化.计算了结构响应的自功率谱密度和方差,对隔震系统和非隔震系统的随机响应进行了比较,讨论了偏心结构的平-扭耦联影响.结论认为扭转耦联效应不可忽视,通过设置隔震层可以消减上部结构的响应.

Analysis of random response of monodirectional eccentric vibration-isolative structure was conducted by means filtered white-noise earthquake model and virtual excitation. By using equivalent linearization method, the non-linear model of base-isolation bearings was transformed into the equivalent linear one. The power spectrum density and variance of structural response was calculated. The random response of isolated system and that of non-isolated system was compared and the influence of translation-torsion coupling of eccentric structure was discussed. It was recognized as a conclusion that the effect of torsion coupling should not be ignored and the response of upper construction could be reduced by using vibrationisolative layers.