工程力学 ›› 2019, Vol. 36 ›› Issue (10): 122-133.doi: 10.6052/j.issn.1000-4750.2018.09.0509

• 土木工程学科 • 上一篇    下一篇

变截面方钢管轻骨料混凝土边柱-钢箱梁折线隔板贯通节点破坏机理和承载力研究

倪威康1, 王万祯1, 贾真2, 吴晓聪1   

  1. 1. 宁波大学土木与环境工程学院, 浙江, 宁波 315211;
    2. 中衡卓创国际工程设计有限公司, 重庆 401147
  • 收稿日期:2018-09-24 修回日期:2019-05-14 出版日期:2019-10-25 发布日期:2019-05-17
  • 通讯作者: 王万祯(1974-),男,河南淮阳人,教授,博士,从事组合结构和钢结构断裂研究(E-mail:wangwanzhen1975@sina.com). E-mail:wangwanzhen1975@sina.com
  • 作者简介:倪威康(1995-),男,浙江兰溪人,硕士生,从事组合结构节点研究(E-mail:616125192@qq.com);贾真(1991-),男,江苏睢宁人,助理工程师,硕士,从事组合结构节点研究(E-mail:904713364@qq.com);吴晓聪(1996-),男,浙江金华人,硕士生,从事组合结构节点研究(E-mail:17855833879@163.com).
  • 基金资助:
    国家自然科学基金项目(51878360);浙江省基础公益技术研究计划项目(LGF18E080007);宁波市自然科学基金项目(2017A610309);宁波市领军和拔尖人才工程项目

STUDY ON THE FAILURE MECHANISM AND STRENGTH OF LINEAR STRENGTHENED DIAPHRAGM-THROUGH JOINTS OF LWA CONCRETE-FILLED SQUARE STEEL TUBULAR SIDE COLUMNS WITH VARIABLE CROSS SECTIONS AND STEEL BOX BEAMS

NI Wei-kang1, WANG Wan-zhen1, JIA Zhen2, WU Xiao-cong1   

  1. 1. School of Civil and Environmental Engineering, Ningbo University, Ningbo, Zhejiang 315211, China;
    2. Zhongheng International Creative Engineering & Design Co., Ltd, Chongqing 401147, China
  • Received:2018-09-24 Revised:2019-05-14 Online:2019-10-25 Published:2019-05-17

摘要: 对变截面方钢管轻骨料混凝土边柱-钢箱梁折线隔板贯通节点进行了低周往复循环加载试验,考察了隔板折线加强构造对节点破坏模式、承载力、塑性转角和延性等抗震性能的影响。采用盲孔法对节点区关键部位进行了焊接残余应力测试,获得了节点区焊接残余应力分布。对节点试验试件进行了基于考虑焊接残余应力的结构钢椭球面断裂模型及耦联的椭球面屈服模型和轻骨料混凝土二次函数型破坏面模型的数值模拟和破坏机理分析,获得了节点区断裂与屈服演化规律和节点域内轻骨料混凝土的受力状态。根据节点试验和数值分析结果,提出了变截面方钢管轻骨料混凝土边柱-钢箱梁折线隔板贯通节点的抗弯、抗剪承载力计算式。

关键词: 方钢管轻骨料混凝土柱, 钢箱梁, 折线隔板贯通节点, 破坏机理, 承载力计算式

Abstract: Low-cycle reversed loading tests were performed on linear strengthened diaphragm-through joints of lightweight aggregate (LWA) concrete-filled square steel tubular side columns with variable cross sections and steel box beams. The effects of the linear strengthened diaphragms on the failure mode, strength, plastic rotation and ductile behavior of the joints were investigated. The distribution of the residual stress of the panel zone was measured using the blind-hole method. The numerical simulation and failure mechanism analysis of tested joints were carried out based on an elliptical fracture model coupled with an elliptical yield model of constructional steel considering the welding residual stress and a general failure model described by using quadratic functions of LWA concrete. The fracture and yield evolution of the welds in the panel zone, the butt welds of the beam flanges and the fillets of the beam webs, and the stress state of LWA concrete in the panel zone are obtained. The formulas for calculating the bending and shear strength are presented for linear strengthened diaphragm-through joints of LWA concrete-filled square steel tubular side columns with variable cross sections and steel box beams based on the numerical analysis and test results.

Key words: lightweight aggregate concrete-filled square steel tubular column, steel box beam, joints with linear strengthened through diaphragms, failure mechanism, formulas for calculating load bearing capacity

中图分类号: 

  • TU398.9
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