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   王  彬，  趙憲忠
   （同濟(jì)大學(xué)建筑工程系，上海 200092）

[摘要] 基于ABAQUS工作平臺(tái)，建立了已完成的8個(gè)平面K形圓鋼管搭接節(jié)點(diǎn)滯回試驗(yàn)的數(shù)值分析模型。將軸向往復(fù)荷載下試驗(yàn)節(jié)點(diǎn)的數(shù)值計(jì)算結(jié)果與試驗(yàn)結(jié)果進(jìn)行對(duì)比分析，討論其破壞模式、滯回曲線、最大承載力的對(duì)比結(jié)果。結(jié)合影響節(jié)點(diǎn)性能的主要幾何參數(shù)，建立71個(gè)數(shù)值分析模型進(jìn)行參數(shù)分析，通過多元參數(shù)回歸方法擬合得出基于Menegotto-Pinto方程的節(jié)點(diǎn)貫通腹桿軸力一變形骨架曲線，并提出了對(duì)應(yīng)的簡(jiǎn)化滯回關(guān)系。分析結(jié)果表明：恢復(fù)力模型與數(shù)值分析結(jié)果吻合良好，可供工程設(shè)計(jì)與數(shù)值簡(jiǎn)化計(jì)算參考。
[關(guān)鍵詞] 圓鋼管相貫節(jié)點(diǎn)；數(shù)值分析；參數(shù)分析；恢復(fù)力模型
中圖分類號(hào)：TU391    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2012) Sl-0716-05

Research on hysteretic model of overlapped CHS K-joints
Wang Bin, Zhao Xianzhong
( Department of Building Engineering, Tongji University, Shanghai 200092, China)

Abstract: Based on nonlinear finite element method,a numerical model was constructed to investigate the hysteric behavior of 8 tested overlapped CHS K-joints under axially cyclic loading. The accuracy of the numerical model was verified by comparing the numerical analyses with mentioned joints focusing on failure mode, hysteretic curve and ultimate capacity. The verified finite element model was conducted on 71 0verlapped CHS K-joints of various geometrical parameters. According to the result of parameter study, the parametric equation of the through brace's skeleton curve was established and so was the hysteretic relationship. Results using the proposed hysteretic model agree well with the finite element analysis results, and the hysteretic model can be used into the initial design of the practical engineering and the numerical analysis.
Keywords: overlapped CHS K-joints; numerical analysis; parametric analysis; hysteretic mode