弯钢箱梁桥的动力分析及模态试验
|
摘要
针对大曲率弯钢箱梁桥的动力特性,通过大型有限元程序分别建立单梁模型、梁格模型及板单元模型,进行了数值仿真分析,同时利用力锤冲击法对室内模型进行了模态试验,并将试验结果与数值分析结果进行对比分析.结果表明,单梁法不适于计算横向模态,普通的梁格法可以较好地模拟弯箱桥竖向和扭转的动力性能,但不应考虑主梁静力计算时横向刚度的换算关系,同时论文提出了一种竖向梁格单元划分法,可以较好地计算弯箱梁结构横向的动力性质,证明梁格法模型可以用于计算该类桥梁的动力特性分析.
In order to study the dynamic characteristic of a curved steel box girder,this paper uses single-beam element and space beam gird method as well as finite element of space plate to simulate the structure respectively.At the same time,a modal test is carried out indoors with impact excitation method,the results of which are compared with those of the three finite element method.The results show that the single-beam method is not appropriate to the calculation of the transverse modals,space beam gird method is advisable in the vertical and torsion direction when disregarding the static transverse stiffness conversion,moreover,the paper introduces a new partition of space beam gird method to simulate the bridge's transverse models.The space beam gird method presented in the paper can be employed well to simulate the dynamic characteristic of cured box girder,and it can give reference to the seismic analysis of the continuous cured girder.
In order to study the dynamic characteristic of a curved steel box girder,this paper uses single-beam element and space beam gird method as well as finite element of space plate to simulate the structure respectively.At the same time,a modal test is carried out indoors with impact excitation method,the results of which are compared with those of the three finite element method.The results show that the single-beam method is not appropriate to the calculation of the transverse modals,space beam gird method is advisable in the vertical and torsion direction when disregarding the static transverse stiffness conversion,moreover,the paper introduces a new partition of space beam gird method to simulate the bridge's transverse models.The space beam gird method presented in the paper can be employed well to simulate the dynamic characteristic of cured box girder,and it can give reference to the seismic analysis of the continuous cured girder.
引文
[1]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42~48.
[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[3]范立础.桥梁工程[M].北京:人民交通出版社,2001.
[4]刘钢城.梁格法在某单箱双室连续箱梁纵向应力分析中的应用[J].铁道勘测与设计,2002,(5):18~20.
[5]韩皓,曹劲松.曲线箱梁桥实用设计方法的研究[J].内蒙古工业大学学报,1997,16(2):23~27.
[6]徐建国,陈淮,王博,等.连续箱梁桥力学性能分析[J].郑州大学学报(工学版),2004,25(1):28~30.
[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[3]范立础.桥梁工程[M].北京:人民交通出版社,2001.
[4]刘钢城.梁格法在某单箱双室连续箱梁纵向应力分析中的应用[J].铁道勘测与设计,2002,(5):18~20.
[5]韩皓,曹劲松.曲线箱梁桥实用设计方法的研究[J].内蒙古工业大学学报,1997,16(2):23~27.
[6]徐建国,陈淮,王博,等.连续箱梁桥力学性能分析[J].郑州大学学报(工学版),2004,25(1):28~30.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心