双向地震作用下弱连接双塔结构Rayleigh阻尼矩阵的建模问题  

Estabulish problem for Rayleigh damping matrix model of weakly connected double-tower structures under bi-directional earthquakes

作　　者：吴竞 楼梦麟 WU Jing;LOU Menglin(Department of Civil Engineering,Tongji Zhejiang College,Jiaxing 314000,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学浙江学院土木工程系,浙江嘉兴314000 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《地震工程与工程振动》2019年第3期61-72,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(91315301)~~

摘　　要：以一双塔式直流电压发生器为例,通过4条地震波水平单向、水平和竖直双向激励下双塔结构地震反应峰值计算结果的对比分析,研究双向地震激励下弱连接双塔结构Rayleigh阻尼矩阵的合理建模方式。研究结果表明:当结构的自振基频远低于输入地震波主要分量的激励频率时,在建立Rayleigh阻尼矩阵过程中应考虑输入地震的频谱特性的影响。在仅有水平单向地震激励时,可选用地震激励水平方向的本体塔架振动第1阶自振频率和水平地震波反应谱的峰值频率作为参数频率用于计算Rayleigh阻尼矩阵中的2个比例系数;当水平和竖直双向地震激励时,2个参数频率的选择涉及因数更为复杂,应综合考虑双塔结构的自振频率和输入地震动的特征频率的不同影响。Taking a pair of tower DC voltage generators as an example,the comparative analysis of the peak results of seismic response of two tower structures under unidirectional,horizontal and vertical bidirectional excitation of four seismic waves is carried out to study the Rayleigh damping of weakly connected twin tower structures under two-way seismic excitation.Reasonable modeling of the matrix.The results show that when the fundamental frequency of the structure is much lower than the excitation frequency of the main component of the input seismic wave,the influence of the spectral characteristics of the input seismic should be considered in the process of establishing the Rayleigh damping matrix.In the case of only horizontal one-way seismic excitation,the first-order natural vibration frequency of the main tower vibration in the horizontal direction of the seismic excitation and the peak frequency of the horizontal seismic wave response spectrum can be used as the parameter frequency to calculate the two proportional coefficients in the Rayleigh damping matrix.When horizontal and vertical two-way seismic excitation,the selection of two parameter frequencies involves more complicated factors,and the different effects of the natural frequency of the two-tower structure and the characteristic frequency of the input ground motion should be considered.

关 键 词：双塔结构 双向地震作用 Rayleigh阻尼矩阵 自振频率 频谱特征 

分 类 号：TU311.3[建筑科学—结构工程]