圆端形钢管混凝土双向偏压柱的力学性能研究

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英文篇名：Behavior of round-end concrete-filled steel tubular columns subjected to the biaxial eccentric compression 作者：吴泓均 ; 王志滨 ; 郝怀霖 英文作者：WU Hongjun;WANG Zhibin;HAO Huailin;College of Civil Engineering, Fuzhou University; 关键词：圆端形钢管混凝土柱 ; 双向偏压 ; 有限元分析 ; 简化计算方法 英文关键词：round-end concrete-filled steel tubular column;;biaxial eccentric compression;;finite element analysis;;simplified formula 中文刊名：FZDZ 英文刊名：Journal of Fuzhou University(Natural Science Edition) 机构：福州大学土木工程学院; 出版日期：2019-02-26 15:03 出版单位：福州大学学报(自然科学版) 年：2019 期：v.47;No.230 基金：福建省自然科学基金资助项目(2017J01696);; 福州市科技计划资助项目(2017-G-101) 语种：中文; 页：FZDZ201904014 页数：6 CN：04 ISSN：35-1117/N 分类号：84-89

摘要

在合理确定钢和混凝土本构模型基础上,运用有限元数值分析软件ABAQUS模拟典型圆端形钢管混凝土双向偏压柱的荷载-变形曲线,开展工作机理分析.分析结果显示:在双向偏压荷载作用下,圆端形钢管混凝土柱能表现出较高的极限承载力和延性;钢管对核心混凝土可起到有效约束作用,圆弧段钢管对混凝土的约束效应高于平直段钢管.典型算例表明圆端形钢管混凝土双向偏压柱的M_x/M_(ux)-M_y/M_(uy)相关曲线呈四分之一椭圆形.最后提出该类双向偏压柱承载力的简化计算式,与有限元模拟结果对比,简化计算结果偏于保守.
        After models of the steel and the core concrete were verified, the finite element(FE) software ABAQUS was used to simulate the load-deformation curves of the round-end concrete-filled steel tubular(RECFST) columns subjected to the biaxial eccentric compression. Meanwhile, the mechanic analysis were carried out. The research results show that, the RECFST columns exhibit high bearing capacity and ductility under the biaxial eccentric compression. The steel tube can effectively confine core concrete, and the confining effect from the arc segment of steel tube is higher than that of the flat segment. Typical examples show that the M_x/M_(ux) and M_y/M_(uy) curves of RECFST columns subjected to the biaxial eccentric compression are quarter-ellipses. Finally, simplified formulas for predicting the strength of RECFST columns subjected to the biaxial eccentric compression were proposed. Compared with FE results, the results using simplified formulas are conservative.

引文

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