大直径钢管混凝土柱-H形钢梁节点设计研究

发布时间：2018-05-18 02:21

本文选题：钢管混凝土柱 + H形钢梁　；参考：《建筑结构学报》2016年01期

【摘要】：在传统内环板节点的基础上,提出一种适用于大直径钢管混凝土柱的梁柱节点。为了避免内环板宽度过大造成混凝土浇筑困难、用钢量较大的问题,在内环板焊接拉结钢筋,既可以减小钢材用量又便于在钢管柱内设置钢筋笼。为避免与钢梁翼缘焊接处的钢管表面发生层状撕裂,局部加大梁端翼缘宽度,并通过分析合理确定梁端扩翼宽度与扩翼角度。采用非线性有限元软件,对节点构造与应力分布、变形性能的关系进行分析。通过对比分析得到梁端的刚域长度,并对刚域长度与框架梁抗弯刚度的关系进行研究。为了验证该类节点设计的合理性,进行钢管混凝土柱-H形钢梁缩尺模型试验。有限元分析与缩尺模型试验结果表明,节点拉结钢筋可以提高内环板传力的有效性,有效减小节点区柱壁应力,当梁端扩翼宽度为1.5倍梁翼缘宽度、扩翼角度为1∶6时,节点区柱壁应力明显低于H形钢梁的应力,满足"强节点弱构件"的抗震设计理念。节点刚度对钢管混凝土柱-H形钢梁框架结构的侧向刚度影响显著,当梁端刚域长度约为钢柱直径的0.4倍时,框架梁的抗弯刚度可增加40%以上。节点抗震性能良好,可以实现"强节点弱构件"的抗震设计理念。
[Abstract]:Based on the traditional inner annular plate joints, a new Liang Zhu joint for large diameter concrete-filled steel tubular columns is proposed. In order to avoid the difficulty of concrete pouring caused by too large width of inner ring plate, the steel bar is welded in the inner ring plate, which can not only reduce the amount of steel but also facilitate the installation of steel cage in steel pipe column. In order to avoid the lamellar tearing on the steel tube surface where the steel flange is welded with the steel beam flange, the width of the flange at the end of the beam is increased locally, and the width and angle of the expanded wing at the end of the beam are reasonably determined through analysis. The nonlinear finite element software is used to analyze the relationship between joint structure and stress distribution and deformation performance. The length of the rigid domain at the end of the beam is obtained by comparative analysis, and the relationship between the length of the rigid domain and the bending stiffness of the frame beam is studied. In order to verify the rationality of the design of this kind of joint, the scale model test of concrete-filled steel tubular column-H-shaped steel beam was carried out. The results of finite element analysis and scale model test show that the joint tension bar can improve the effectiveness of the internal ring plate transmission force, and effectively reduce the stress of column wall in the joint zone. When the width of the expanded wing at the end of the beam is 1.5 times the width of the flange of the beam and the angle of the expanded wing is 1:6, The stress of column wall in joint area is obviously lower than that of H-shaped steel beam, which satisfies the seismic design idea of "strong joint and weak member". The joint stiffness has a significant effect on the lateral stiffness of concrete-filled steel tubular column (CFST) -H-shaped steel beam frame structure. When the length of the rigid zone of the beam is about 0.4 times of the diameter of the steel column, the flexural stiffness of the frame beam can be increased by more than 40%. The seismic performance of joints is good, and the seismic design idea of "strong joints and weak members" can be realized.
【作者单位】：中国建筑设计研究院;北京工业大学抗震与结构诊治北京市重点实验室;阳光保险集团股份有限公司;
【基金】：中国建设科技集团股份有限公司科技创新基金项目(Z2014J09)
【分类号】：TU398.9

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