附加粘滞阻尼器结构的随机地震响应谱分析

Random seismic response spectrum analysis of structure with additional viscous damper

粘滞阻尼器在结构振动控制中应用广泛。附加粘滞阻尼器结构的随机地震响应分析中,存在的主要问题是此类结构的阻尼和刚度都是非线性的,通用的响应谱分析方法不再适用。为简化分析过程,采用等价线性化法,利用与弹性响应谱相一致的功率谱密度函数的概念以及结构峰值响应求解的方法,从而获得Clough-Penzien地震谱激励下单自由度结构的位移响应谱。在此基础上,讨论结构周期、阻尼器参数以及场地条件对结构地震响应计算结果的影响,将分析结果与蒙特卡洛模拟得到的结果进行对比,验证了该分析方法的准确性和适用性。

Viscous dampers are widely used in structural vibration control.In the random seismic response analysis of structures with additional viscous dampers,due to the nonlinearity in both structural stiffness and damping,the main problem is that the general response spectrum analysis method is no longer applicable.In order to simplify the analysis process,the concept of power spectral density function which is consistent with the elastic response spectrum and the method to solve the peak response of the structure are used to obtain the displacement response spectrum of the single degree of freedom structure excited by Clough-Penzien seismic spectrum.On this basis,the analysis results are compared with the results of Monte-Carlo simulation to discuss the influence of structural period,damper parameters and site conditions on the calculation results of structural seismic response,and the accuracy and applicability of the analytical method are verified.