组合结构等效阻尼比的确定及在有限元计算中的应用

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.

Determination for equivalent damping ratio ofcomposite structure and its application infinite element analysis

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.