T形钢管混凝土组合柱-钢筋混凝土梁外伸端板连接节点力学性能研究*
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（1 武汉理工大学土木工程与建筑学院， 武汉 430070； 2 武汉理工大设计研究院， 武汉 430070）
［摘要］通过静力加载试验及ABAQUS非线性有限元分析来研究T形钢管混凝土组合柱-钢筋混凝土梁外伸端板连接节点力学性能。结果表明：节点剪力主要由核心区形成的斜压杆来承担，而牛腿腹板承担的比例较小；设置加劲肋可有效抑制端板翘曲变形，缓解节点区应力集中，比增加端板厚度更能有效提高节点抗弯承载力；轴压比小于0.4时，增大轴压比节点抗弯承载力略有提高，轴压比大于0.4时，增大轴压比节点抗弯承载力稍有降低，但提高、降低的幅值均很小；梁柱线刚度比对节点抗弯承载力影响较小；提高框架梁混凝土强度等级，节点抗弯承载力相应有所提高；提高框架梁配筋率，节点抗弯承载力明显增大，但当配筋率超过1.8%后继续提高时，节点抗弯承载力提高的幅值较小；有限元计算骨架曲线与试验结果能较好吻合，验证了有限元模型的合理性。［关键词］T形钢管混凝土组合柱; 外伸端板连接节点; 力学性能; 非线性有限元分析中图分类号：TU398 文献标识码：A 文章编号：1002-848X(2016)12-0080-08
Study on mechanical property of extended-end-plate joint between reinforced concrete beam and T-shaped concrete-filled rectangular composite tubular columnHuang Jun1,2, Liu Jixiong1，2, Cai Yue1, Xie Jianye1, Dai Shaobin1,2(1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China; 2 Design & Research Institute, Wuhan University of Technology, Wuhan 430070, China)Abstract: The static loading experiment and ABAQUS nonlinear finite element analysis were conducted to study the mechanical property of extended-end-plate joint between reinforced concrete beam and T-shaped concrete-filled rectangular composite tubular column. The results indicate that the shear forces of joint is borne mainly by inclined compression strut formed in core region and a small proportion is shared by the corbel web. Configuring stiffeners can suppress the warping deformation caused by the bulging of extended-end-plate effectively and relieve the stress centralization, which is more effective to improve the bending bearing capacity of joint than increasing the thickness of end plate. When the axial compression ratio is less than 0.4, the bending bearing capacity of the joint increases slightly with the improvement of the axial compression ratio; when the ratio is more than 0.4, the bending bearing capacity decreases lightly, but both the increasing and decreasing amplitudes are negligible. The linear stiffness ratio of beam and column has a little influence on the bearing bending capacity of the joint. Increasing the concrete strength of frame beam improves the bending bearing capacity of the joint to some extent. With the improvement of reinforcement ratio of frame beam, the bending benring capacity of the joint increases significantly, but when the reinforcement ratio of the frame beam is more than 1.8%, the increasing amplitude of the bending bearing capacity of the joint is very small. The finite element calculation skeleton curve well agrees with the test results, which verifies the rationality of the finite element model.Keywords: T-shaped concrete-filled rectangular composite tubular column; extended-end-plate joint; mechanical property; nonlinear finite element analysis
*湖北省自然科学基金（2012FFB05112）,2015武汉市“黄鹤英才（城市建设）计划”。通讯作者：刘记雄，博士，工程师，Email:ljxabccba@whut.edu.cn。
