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如何简便合理地确定组合结构的整体阻尼比是结构抗震设计中的重要内容.在动力时程分析时,结构系统是确定的,然后对结构施加不同的作用,来求解结构的响应.基于此点,本文从振型能量角度出发,提出一种求解多维地震作用下空间结构整体阻尼比的新方法.在结构模型确定后,可根据动力时程分析所要输入结构的地震波的情况,估算结构的整体阻尼比,通过计算得出此法所需截取的振型数可以按照“振型参与质量达到总质量的90%”的原则进行确定.并将此法计算的阻尼比与位能加权平均法进行了对比,认为在进行时程分析时,阻尼比应根据要输入的地震动及结构来确定,计算结果才会更加合理.
How to determine the overall damping ratio of composite structures simply and reasonably is an important part in seismic design of structures.During the dynamic time history analysis, the structural system is determined and then the structure is given different roles to solve the structural response.According to this point , This paper proposes a new method to solve the overall damping ratio of the space structure under the action of the mode shape energy.After determining the structure model, the structure of the whole structure can be estimated according to the dynamic time history analysis of the seismic wave to be input into the structure Damping ratio, the number of vibration modes intercepted by this method can be calculated according to the principle of “90% of the total mass of participation of the mode shapes”, and the damping ratio and the weighted average The results show that the damping ratio should be determined according to the ground motion and structure to be input, and the calculation result will be more reasonable.