作　　者： ; ;

机构地区： 华南理工大学

出　　处： 《公路》 2011年第11期46-51,共6页

摘　　要： 比较箱梁不同桥型的抗扭刚度差异,优化箱梁桥型,对于国内大量建设城市轨道交通尤为重要。通过对五种轻轨箱形桥梁的有限元建模,归纳总结了五种箱形桥梁前10阶的固有频率和振型特征,并对模态分析结果进行了横向、纵向的对比,同时还研究了固有频率和结构刚度的关系,最后对轻轨箱形桥梁的桥型进行了优化。结果表明,带端隔墙和横隔板箱梁的抗扭刚度比不带端隔墙和横隔板箱梁大得多,横隔板偏心开孔单箱双室梁的抗扭刚度比横隔板中心开孔的大,带端隔墙和偏心开孔横隔板的单箱双室箱梁是轻轨箱形桥梁中较优的桥型。 Top 10 natural frequencies and mode shape characteristics of five types of light-rail box girder bridges are summarized by FE modeling,and the mode analysis results are horizontally,vertically contrasted.Furthermore,the relationships between the natural frequency and structural stiffness are studied.Finally,the bridge-types of five types of light-rail box girder bridges are optimized.The results show that the torsional rigidity of the box girder with side walls and diaphragms is much greater than that of the box girder without side walls and diaphragms,the torsional rigidity of the single box double cell box girder with eccentric hole diaphragms is greater than that of the single box double cell box girder with center hole diaphragms,and the single box double cell box girder with side walls and eccentric hole diaphragms is the optimal bridge type of all light-rail box girders.

关 键 词： 箱形梁桥 模态分析 桥型优化 振型 固有频率 刚度

领　　域： [建筑科学] [交通运输工程]