V形连续刚构梁拱组合桥内力分析  

Internal force analysis of the girder and arch combination bridge with continuous rigid frame and V-shaped support

作　　者：刘世忠[1] 任万敏[2] 

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]中铁二院工程集团有限责任公司,成都610031

出　　处：《振动与冲击》2009年第2期56-59,76,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50378076);兰州交通大学"青蓝"基金(QL-04-08A)

摘　　要：以一V形连续刚构梁拱组合桥为研究对象,介绍了V形桥墩连续刚构梁拱组合桥的设计构思,采用自编SMAD有限元计算程序,重点分析了墩身尺寸及边界条件对整个结构的影响。通过优化计算巧妙的解决了收缩、徐变次内力和预应力、温度次内力对结构的不利影响;本桥系梁与拱肋的横向刚度比为1926:1,通过在主梁主要收缩徐变完成后成拱以及对吊杆进行二次调索的施工方法有效解决了刚性系杆柔性拱的横向稳定问题;三维地震反应结果表明桥梁上部各部位的地震力不是该桥的控制内力,说明本桥设计构造具有良好的抗震性能。内力分析方法与结论对同类型桥梁设计施工具有参考价值。The design of V-shaped piers of the beam-arch combination system bridge with continuous rigid frame was introduced.Using SMAD finite element procedure,the influences of the size of pier bodies and boundary conditions on the whole structure were analysed.Through optimiation of computation,the adverse effects of shrinkage,pre-stress and second internal forces caused by creep and temperature,etc.,on the structure were investigated and managed to be eliminated accordingly.The lateral stiffness ratio of the tie beam to the arch rib of bridge is 1926∶1.Constructing the arch of main girder after completion of main shrinkage and creep,and erecting the suspenders by the method of twice regulating supporting cables,the lateral stability of frame arch bridge with flexible bars was ensured.Three-dimensional seismic responses analysis of the bridge shows that the seismic forces of all upper parts of the bridge are not the control internal forces of the bridge,and illustrates the structural construction of the bridge has a good seismic performance.

关 键 词：V形桥墩 梁拱组合 收缩徐变 拱的稳定 地震反应 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] TU473.1[交通运输工程—道路与铁道工程]