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结构地震反应分析中的阻尼问题探讨
谢靖中
摘 要
(上海佳构软件科技有限公司, 上海 200437)

[摘要]简要介绍结构地震反应分析所涉及到的阻尼的概念和方法。指出阻尼是宏观统计量,所有引起振动能量耗散的因素都属于阻尼。阻尼是结构的属性,而阻尼比与结构振型直接相关,瑞利阻尼是通过附加条件建立起由振型阻尼比得到结构阻尼的方法。在非线性动力时程分析中,构件滞回耗能相当于阻尼作用,而材料刚度退化与滞回耗能的作用效果不同。显式积分、隐式积分中的阻尼需要采用不同的处理方法,显式积分中不宜包含阻尼的刚度分量。多高层结构对地震波有滤波作用,影响大的是地震波的低频部分。
[关键词]地震反应; 弹塑性时程; 阻尼; 建筑结构
中图分类号:TU311.3      文献标识码:A      文章编号:1002-848X(2015)23-0053-06

Discussion on damping in structural seismic response analysis
 
Xie Jingzhong
 
(Shanghai Jiagou Software Technology Co., Ltd., Shanghai 200437, China)
 
Abstract: Some concepts and methods of damping involved in structural seismic response analysis were briefly introduced. The damping was a macro-equivalent value and all factors that induced energy dissipation in structural vibration were damping. The damping was a basic property of the structure and damping ratio was related to structural vibration modes, and the Rayleigh damping was the method established by some additional assumptions to obtain structural damping according to modal damping ratio. The components′hysteretic energy dissipation was equal to the role of damping in nonlinear dynamic time-history analysis, and material stiffness degeneration had different effects compared with hysteretic energy dissipation. Different damping computing methods should be adapted in implicit and explicit integration methods, in which the stiffness partition of damping should not be involved in explicit integration methods. Multilayer and high-rise buildings could filter high frequency parts of earthquake waves, and the low frequency parts took main effect.
 
Keywords: seismic response; nonlinear time-history analysis; damping; building structure

作者简介:谢靖中,博士,Email:strat@strat.cn
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