大直径钢管混凝土柱-H形钢梁节点设计研究  

Research on large diameter concrete filled tubular column and H-section beam connection

作　　者：范重[1] 仕帅 李振宝[2] 王倩倩[2] 赵长军[1] 寇力 史建伟 

机构地区：[1]中国建筑设计研究院,北京100044 [2]北京工业大学抗震与结构诊治北京市重点实验室,北京100022 [3]阳光保险集团股份有限公司,北京100020

出　　处：《建筑结构学报》2016年第1期1-12,共12页Journal of Building Structures

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)

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。A new type of beam-column connection for large diameter concrete filled tubular column was proposed on the basis of traditional inner ring plate connections. In order to avoid the difficulty of pouring concrete and using more steel due to the wider inner ring plate, welding reinforcing bars on the inner ring plate were used, which could reduce the amount of steel and be convenient for setting reinforcing bar cage in the steel pipe column. In order to avoid the lamellar tearing of the surface of steel pipe column, flange at the beam end needs to be widened. The width and angle of flange were reasonably determined by analysis. The relationship between connection detail and stress distribution was fully analyzed by nonlinear finite element software. The rigid zone length of beam-column connection was obtained by comparative analysis. The relationship between rigid zone length and bending stiffness of frame beam was researched. In order to verify the rationality of the new type connection, experimental studies on the scale model of concrete filled tubular column and H-section beam connection were conducted. The results of finite element analysis and scaled model tests indicate that the steel bar can improve the force- transfer by inner ring plate and the stress of connection is reduced effectively. When the flange width is expanded 1.5 times and the widened angle is 1：6, the maximum stress on connection zone is significantly lower than H-section beam and the earthquake-resistant design philosophy of ＇strong-joint and weak-member＇ is satisfied. The connection stiffness has remarkable effect on the lateral stiffness of frame structure which has concrete filled tubular column and H-section beam connections. The bending stiffness of the frame beam can be increased by more than 40 percent when the rigid zone length is about 0.4 times the diameter of steel pipe. The seismic behavior of the connection is good and the seismic design concepts of ＇ strong-joint and weak-member＇ can be realized.

关 键 词：钢管混凝土柱 H形钢梁 节点刚域 有限元分析 拟静力试验 抗震性能 

分 类 号：TU973.14[建筑科学—结构工程] TU311.41