V形连续刚构梁拱组合桥内力分析
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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.
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.
引文
[1]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社.2003.
[2]金成棣.预应力混凝土梁拱组合桥梁———设计研究与实践[M].北京:人民交通出版社.2001.
[3]吴鸿庆,任侠.结构有限元分析[M].北京,中国铁道出版社.2000.
[4]刘世忠,吴辉.薄壁箱梁内力影响面的实用计算方法[J].中国公路学报,2007,20(4):71-76.
[5]彭文成.V型墩连续刚构主墩底水平力和弯矩的计算分析[J].交通科技,2004,205(4).
[6]许汉铮,等.连续弯梁(刚构)桥的统一计算模式[J].中国公路学报,200215(4):57-05.
[7]华东水利学院弹性力学问题的有限单元法[M].北京:水利出版社,1982.
[8]朱玉.钢管混凝土系杆拱桥地震反应分析[D].兰州:兰州交通大学,1997.
[2]金成棣.预应力混凝土梁拱组合桥梁———设计研究与实践[M].北京:人民交通出版社.2001.
[3]吴鸿庆,任侠.结构有限元分析[M].北京,中国铁道出版社.2000.
[4]刘世忠,吴辉.薄壁箱梁内力影响面的实用计算方法[J].中国公路学报,2007,20(4):71-76.
[5]彭文成.V型墩连续刚构主墩底水平力和弯矩的计算分析[J].交通科技,2004,205(4).
[6]许汉铮,等.连续弯梁(刚构)桥的统一计算模式[J].中国公路学报,200215(4):57-05.
[7]华东水利学院弹性力学问题的有限单元法[M].北京:水利出版社,1982.
[8]朱玉.钢管混凝土系杆拱桥地震反应分析[D].兰州:兰州交通大学,1997.
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