矩形钢管混凝土树状节点受力分析
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国家重大基础研究前期研究专项基金资助项目(2003CCA01500)


Behavior of dendriform connections of concretefilled steel rectangular tubes
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    摘要:

    钢管混凝土树状节点是由钢管混凝土Y形柱与双十字形梁柱节点组合而成的复杂节点。采用ANSYS对该类节点进行非线性有限元计算分析,计算模型考虑材料,几何和接触非线性。梁端荷载位移曲线以及滞回曲线与试验吻合较好,并能准确模拟出节点的破坏形态。分析有限元计算结果表明:梁端加劲肋使拉压应力能有效传递到内隔板,中间孔洞的存在对内隔板的传力影响较小,反复荷载作用下节点核心区混凝土对角区受压,对梁端压应力的传递有较大贡献。

    Abstract:

    Dendriform connections of concrete filled steel rectangular tubes (CFSRT) are composed of a bifurcated column and doublecruciform beamcolumn connections. A 3D nonlinear finite element analysis (FEA) which considers all nonlinear effects of materials, geometry and contact interfaces is established. Analysis of the FEA results show that the loaddisplacement curves at the ends of the beam and hysteretic curves obtained experimentally and via FEA agreed with each other. The stiffener transfers the tensioncompression stress efficiently, the middle hole has little influence on the stress transfer, and the compressive zone of the core concrete under repeated loading has a greater contribution to the compression stress transfer.

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刘东,甘正立,赵仕兴,李正良.矩形钢管混凝土树状节点受力分析[J].重庆大学学报,2009,32(1):50-54.

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