基于复模态的非比例阻尼结构参数识别研究  

Study on parameters identification of non-proportional damping based on complex modes

作　　者：王建有[1] 陈健云[1] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116023

出　　处：《哈尔滨工业大学学报》2005年第12期1647-1649,共3页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50209002);辽宁省自然科学基金资助项目(20022130)

摘　　要：在地下结构地震响应的简化分析模型中,无限地基的辐射阻尼通常以附加阻尼罐的形式与结构动力刚度阵耦合在一起,其阻尼形式不同于结构阻尼或比例阻尼.由于复杂地质条件以及计算规模的限制,采用理论或数值分析方法得到的无限地基辐射阻尼参数与实际情况往往有较大的差别.引入节点阻尼,并提出利用复特征对进行参数识别的思想.同时为了解决由于阻尼阵与刚度阵的耦合而产生的非线性问题,构造了一种迭代算法.结果表明,算法能够比较准确地识别各类参数.The radiation damping induced by an infinite medium has great effects on the dynamic response of underground structures, which is usually added on the nodes at the outer boundary of the structures in a simplified model. The mechanics of radiation damping is different from the structural damping and is difficult to obtain because of the complexity of geological and geographical conditions and the limit of computational size. In this paper, the complex modes are used to obtain the parameters of this kind of structure and an iterative algorithm is proposed in solving the coupling of damping and stiffness. Finally, a numerical example is applied and the results show that the oarameters including node damning can be estimated accurately.

关 键 词：地下结构 参数识别 节点阻尼 结构-地基动力相互作用 

分 类 号：TU311.3[建筑科学—结构工程] TU91