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曹勝濤1,2，李志山1，劉春明 2，楊志勇2
（1 廣州大學(xué)減振控制與結(jié)構(gòu)安全國家重點(diǎn)實(shí)驗(yàn)室（培育）， 廣州 510405；
2 中國建筑科學(xué)研究院， 北京 100013）
［摘要］為保證結(jié)構(gòu)大震非線性顯式動力時(shí)程分析和小震反應(yīng)譜分析阻尼模型的一致性，提出了三種阻尼模型(振型阻尼、振型阻尼結(jié)合剛度阻尼、振型阻尼結(jié)合質(zhì)量阻尼)的顯式積分格式，并從顯式求解精度、穩(wěn)定性以及對高階振型放大響應(yīng)的抑制作用的角度對三種振型阻尼模型進(jìn)行了分析。采用PKPM-SAUSAGE軟件，通過某實(shí)際工程算例的小震反應(yīng)譜計(jì)算結(jié)果和采用三種振型阻尼的顯式動力時(shí)程計(jì)算結(jié)果的對比，分析了高階振型放大響應(yīng)對結(jié)構(gòu)動力分析的影響以及三種振型阻尼對高階振型放大響應(yīng)的抑制作用，結(jié)果表明振型阻尼結(jié)合質(zhì)量阻尼綜合效果較好。
［關(guān)鍵詞］振型阻尼； 非線性顯式動力計(jì)算； 求解精度； 穩(wěn)定性； 高階振型放大響應(yīng)； PKPM-SAUSAGE
中圖分類號：TU311.3, TU311.41文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2016)01-0030-08
Application of modal damping in nonlinear explicit dynamic analysis of large-scale structure
Cao Shengtao1,2, Li Zhishan1, Liu Chunming2 , Yang Zhiyong2
(1 State Key Laboratory for Seismic Control and Structural Safety(Cultivation base),
Abstract:In order to ensure the damping consistency of nonlinear explicit dynamic analysis of structure under rare earthquake and response spectrum analysis of structure under small earthquake, three structure damping applying methods for the explicit dynamic equation integration were proposed, namely modal damping method, modal damping combined with stiffness damping modification method and modal damping combined with mass damping modification method. The accuracy, stability and the inhibition effect on amplification effects of high order modes were discussed. These modal damping applying methods were implemented in software package called “PKPM-SAUSAGE”. A real project was analyzed by PKPM-SAUSAGE, response spectrum calculation results under small earthquake and explicit dynamic calculation results with three kinds of modal damping were compared, influence of high order modes and inhibition effect of the three kinds of modal damping on amplification effects of high order modes were also discussed. Research results show that the modal damping combined with mass damping modification method is best method among the three proposed methods.
Keywords:modal damping; nonlinear explicit dynamic analysis; accuracy； stability; amplification of high order mode; PKPM-SAUSAGE
*教育部創(chuàng)新團(tuán)隊(duì)IRT13057。
作者簡介：曹勝濤,博士研究生,Email:caoshengtao@cabrtech.com。
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