作　　者： ; ; ; ;

机构地区： 上海大学土木工程系

出　　处： 《振动与冲击》 2013年第1期8-13,共6页

摘　　要： 针对高层隔震结构的双质点简化模型提出了可快速计算其地震响应的单纯质点法,该方法基于基底剪力及能量等效原则来建立简化两质点分析模型与原结构模型之间的转换关系及简化模型的参数取值,推导得到了确定地震反应的两个关键参数:刚度转换系数和质量比。研究基于能量平衡方法提出了高层隔震结构简化分析模型包络反应的计算式,并通过利用能量平衡原理及模型参数转换关系来预测原高层隔震结构的各层地震反应包络值。对22层高层隔震结构工程实例首先进行了双质点模型的转化,其后验证了单纯质点法的有效性和分析精度,分析结果表明新方法计算结果与多质点模型时程分析法计算结果相近,且能包络上部结构各层地震响应。该方法计算量少,参数取值简便,可用于高层隔震结构地震响应的初步分析。 Aiming at a two-mass simplified model of a high-rise isolated structure, the pure mass method （PMM） utilized to calculate quickly earthquake responses of high-rise isolated structures was proposed here. Firstly, the conversion relation between the two-mass simplified model and the archetype was established and the parameters of the two-mass model were determined according to the equivalent criteria for base shear force and energy. And then, two key parameters of stiffness conversion coefficient and mass ratio were obtained to determine seismic responses. The envelope response calculation formulas of the simplified model were proposed based on the energy balance method. The energy balance method and the model conversion relation were used to predict the seismic response envelope values of every layer of the archetype. An engineering example of 22-story high-rise isolated structure was converted into a two-mass simplified model. Then, the effectiveness and analysis accuracy of the pure mass model method were verified. It was shown that computational results of the new method are similar to those with multi-mass model time history analysis method; the calculation time of the proposed method is less, and the model parameters determination is clear and convenient; the new method can be applied to analyze the earthquake responses of high-rise isolated structures.

关 键 词： 高层隔震结构 单纯质点法 简化模型 参数取值方法 能量平衡

领　　域： [建筑科学]