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组合结构等效阻尼比的确定及 在有限元计算中的应用
引用本文:周向阳,张其林.组合结构等效阻尼比的确定及 在有限元计算中的应用[J].计算机辅助工程,2007,16(3):6-9.
作者姓名:周向阳  张其林
作者单位:同济大学,土木工程学院,上海,200092
摘    要:针对组合结构动力响应计算中,一般根据工程经验确定结构阻尼比,往往导致结构动力响应计算结果偏小,不利于结构安全评估的问题,首先根据复阻尼理论与结构动力学方法,推导出组合结构的等效阻尼比计算公式;然后,以某体育场组合结构为工程背景,在有限元法基础上使用ANSYS软件建立该结构的有限元模型.根据计算出的自振特性以及利用ANSYS二次开发功能所形成的阻尼刚度矩阵,实现等效阻尼比的有限元法求解.计算结果表明,等效阻尼比能够正确反映组合结构的动力特性,从而可以科学地计算其动态响应.

关 键 词:有限元  组合结构  等效阻尼比  阻尼刚度  动力特性  ANSYS  组合结构  结构等效阻尼比  有限元计算  应用  finite  element  analysis  application  composite  structure  equivalent  damping  ratio  动态响应  地计算  科学  动力特性  求解  刚度矩阵  开发功能  利用  自振特性  有限元模型  软件  ANSYS
文章编号:1006-0871(2007)03-0006-04
收稿时间:2007-05-10
修稿时间:2007-07-02

Determination for equivalent damping ratio of composite structure and its application in finite element analysis
ZHOU Xiangyang and ZHANG Qilin.Determination for equivalent damping ratio of composite structure and its application in finite element analysis[J].Computer Aided Engineering,2007,16(3):6-9.
Authors:ZHOU Xiangyang and ZHANG Qilin
Affiliation:College of Civil Eng. , Tongji Univ. , Shanghai 200092, China
Abstract:The structural damping ratio is usually determined by engineering experience in calculation of composite structural dynamic response. The computational results are often lower than actual value and bring disadvantages into evaluation of structural safety. Therefore, the formula for equivalent damping ratio of composite structure is deduced according to complex damping theory and structural dynamics method. Then the finite element model of a stadium is established by ANSYS based on finite element methods. The calculation on equivalent damping ratio of composite structure with finite element method is implemented by dynamic characteristics of structure and damping stiffness matrix obtained by secondary development of ANSYS. The resuhs show that the equivalent damping ratio can reflect dynamic characteristics of composite structures rightly and calculate its dynamic response scientifically.
Keywords:finite element  composite structure  equivalent damping ratio  damping stiffness  dynamic characteristic  ANSYS
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