結(jié)構(gòu)地震反應(yīng)分析中的阻尼問題探討
謝靖中
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(上海佳構(gòu)軟件科技有限公司， 上海 200437)
［摘要］簡要介紹結(jié)構(gòu)地震反應(yīng)分析所涉及到的阻尼的概念和方法。指出阻尼是宏觀統(tǒng)計量，所有引起振動能量耗散的因素都屬于阻尼。阻尼是結(jié)構(gòu)的屬性，而阻尼比與結(jié)構(gòu)振型直接相關(guān)，瑞利阻尼是通過附加條件建立起由振型阻尼比得到結(jié)構(gòu)阻尼的方法。在非線性動力時程分析中，構(gòu)件滯回耗能相當于阻尼作用，而材料剛度退化與滯回耗能的作用效果不同。顯式積分、隱式積分中的阻尼需要采用不同的處理方法，顯式積分中不宜包含阻尼的剛度分量。多高層結(jié)構(gòu)對地震波有濾波作用，影響大的是地震波的低頻部分。［關(guān)鍵詞］地震反應(yīng); 彈塑性時程; 阻尼; 建筑結(jié)構(gòu)中圖分類號：TU311.3 文獻標識碼：A 文章編號：1002-848X(2015)23-0053-06
Discussion on damping in structural seismic response analysisXie 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
作者簡介：謝靖中，博士，Email：strat@strat.cn。
