工程力学 ›› 2019, Vol. 36 ›› Issue (5): 100-109.doi: 10.6052/j.issn.1000-4750.2018.03.0155

• 土木工程学科 • 上一篇    下一篇

外接式组合桁架节点初始转动刚度研究

周凌宇1, 薛宪鑫1,2   

  1. 1. 中南大学土木工程学院, 湖南, 长沙 410075;
    2. 中设设计集团股份有限公司, 江苏, 南京 210014
  • 收稿日期:2018-03-16 修回日期:2018-07-07 出版日期:2019-05-25 发布日期:2019-03-28
  • 通讯作者: 周凌宇(1973-),男,湖南人,教授,博士,博导,主要从事组合结构研究(E-mail:zhoulingyu@csu.edu.cn). E-mail:zhoulingyu@csu.edu.cn
  • 作者简介:薛宪鑫(1992-),男,山东人,硕士生,主要从事组合结构研究(E-mail:xuexianxin1992@163.com).
  • 基金资助:
    国家自然科学基金项目(51578546);高速铁路基础研究联合基金项目(U1434204)

STUDY ON INITIAL ROTATIONAL STIFFNESS OF EXTERNAL COMPOSITE TRUSS JOINT

ZHOU Ling-yu1, XUE Xian-xin1,2   

  1. 1. School of Civil Engineering, Central South University, Changsha, Hu'nan 410075, China;
    2. China Design Group Co. Ltd., Nanjing, Jiangsu 210014, China
  • Received:2018-03-16 Revised:2018-07-07 Online:2019-05-25 Published:2019-03-28

摘要: 新建银西线铁路渭河特大桥主桥为4×60 m钢桁腹-混凝土连续箱梁桥,考虑本桥型中半刚性节点转动性能不明确的问题,该文讨论了对外接式组合桁架节点初始转动刚度及其对桥梁受力性能的影响。首先定义了节点域,然后通过传力路径分析将节点域简化成弦杆、PBL剪力键群以及外露节点板三个有效力学组件,利用组件法原理推导出了各有效力学组件的弹簧刚度表达式,得到节点的初始转动刚度函数表达式。建立了节点有限元模型,并将数值结果与理论结果相比较,验证了模型的有效性以及理论分析的正确性。此研究成果为后续外接式节点的弯矩-转角曲线研究奠定了基础。

关键词: 半刚性, 组合节点, 节点域, 初始转动刚度, 组件法, 弯矩-转角曲线

Abstract: The main span crossing the Weihe river in Yinchuan to Xi'an railway is a concrete continuous box beam with steel trusses, whose length is 4×60 m. For the problem of uncertain performance of a semi-rigid joint in design, the initial rotational stiffness of an external composite truss joint is studied. First, the joint zone was defined. Then, by the transmission path, the joint zone was simplified into three effective mechanical components:a chord, a PBL shear key group, and an exposed joint plate. Based on the principle of component method, the spring stiffness expressions of effective mechanical components were derived, and the initial rotation stiffness function expression of the joint was obtained. A finite element model of the joint was established. By comparing the numerical results and the theoretical calculation results, the validity of the model and the correctness of theoretical analysis were verified. The research results laid the foundation for the study of the moment rotation curve of the external joint.

Key words: semi-rigid, combined joint, joint zone, initial rotational stiffness, component method, momentrotation curve

中图分类号: 

  • TU398.9
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