钢管腹杆-混凝土K形组合节点试验及仿真分析  

Experiment and Simulation Analysis of K-Shape Composite Joint of Steel Tube Web Members and RC Chord

作　　者：端茂军[1] 刘钊[1] 张建东[2] 刘朵[2] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]江苏省交通科学研究院股份有限公司,江苏南京211112

出　　处：《桥梁建设》2017年第5期47-52,共6页Bridge Construction

基　　金：江苏省自然科学基金面上资助项目(BK2009028);江苏省交通科学研究计划资助项目(2014Y01)~~

摘　　要：为研究钢桁腹-混凝土组合梁中钢管腹杆与混凝土弦杆K形组合节点的传剪机理,开展K形节点区抗剪试验及节点区键销钢筋、连接螺栓的直剪试验,得到K形节点区的破坏形态,并通过试验提出的钢筋及螺栓直剪的多折线荷载~位移本构模型,进行K形节点区的精细化三维非线性仿真分析。研究结果表明,K形节点区的竖向剪力来自于相邻节间弦杆的轴力差,键销钢筋及连接螺栓的直剪破坏是节点区受剪失效的主要原因,其抗剪承载力主要由键销钢筋及连接螺栓提供;所建立的K形节点区非线性仿真模型能够较好地反映节点区的破坏形态,极限承载力及荷载~位移曲线与试验结果吻合良好。To study the shear transfer mechanism of the K-shape composite joint of the steel tube web members and reinforced concrete（RC）chord in the steel truss web and concrete slab composite girder,the shear test of the K-shape composite joint area and the direct shear test of the pin coupling reinforcement and connecting bolts in the area were carried out and the failure modes of the area were obtained.Based on the tests,the multi-linear load^displacement constitutive models for the direct shear of the reinforcement and connecting bolts were proposed and the refined three-dimensional nonlinear simulation analysis of the area was conducted.The results of the tests and analysis demonstrate that the vertical shear of the K-shape composite joint area originates from the axial force differences of the chords of the adjacent truss panels.The direct shear failure of the pin coupling reinforcement and connecting bolts is the major cause leading to the shear failure of the area and the shear capacity of the area is provided mainly by the reinforcement and connecting bolts.The nonlinear simulation models for the area established in this paper can well reflect the failure modes of the area and the ultimate bearing capacity and the load^displacement curves are in good agreement with those of the tests.

关 键 词：组合梁 钢管腹杆 K形节点 传剪机理 抗剪试验 直剪试验 非线性仿真分析 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U443.4[交通运输工程—道路与铁道工程]