基于Midas/Civil的某高墩曲线变截面波纹钢腹板PC组合连续箱梁刚构桥动力特性有限元分析

Dynamic Characteristics Analysis of Continuous Rigid Frame Bridge with Corrugated Steel Webs Under High Pier and Variable Cross Section

以兰州市北环路东段小砂沟大桥为工程背景,采用大型通用有限元软件Midas/Civil建立模型,通过设置不同位置及不同数量横系梁进行动力特性分析.结果表明:在曲线波纹钢腹板连续刚构桥桥墩之间设置横系梁时,主梁的自振频率比不设横系梁时低;过多地设置横系梁,对主梁的自振频率基本不产生影响;合理设置横系梁可增大梁体的横向刚度,可避免横向振动过早出现;过多地设置横系梁,对主梁的横向刚度增加不明显.

Using the Xiao sha gou background, a large-scale general characteristics establish the model. Bridge in the eastern section of Beihuan Road in Lanzhou as tile engineering rink By natural frequency of the main girder is e element software named Midas/Civil was used to to analyze the dynamic setting the cross beam with different positions and different numbers, the lower than that of the girder without transverse girder when the girders are arranged between the bridge piers of the continuous rigid frame bridge with curved corrugated webs. The natural frequencies of the main girder are basically not set too much. The transverse stiffness of the beam body can be in- creased by setting the transverse girder reasonably to prevent the premature emergence of the transverse vibration. If the transverse girder is set too much, the transverse rigidity of the girder is not obviously increased.