桥面形式对桁式铁路桥梁抗风性能的影响

摘要

In order to study the influence of deck form on wind-resistance performance of the railway steel flexible arch bridge with truss girder,two kinds of steel truss girder with open deck and orthotropic deck were studied in this paper.Based on the computational fluid dynamics (CFD) method,simplified two-dimensional analysis models were set up to analyze the differences of the disturbed flow field,the static aerodynamic coefficient,the performances of the vortex vibration and galloping of main girder.The results show that main girder with open deck is subjected to less static wind load,and its critical wind velocity of galloping is slightly larger.And the minimum vortex vibration velocity of main girder with orthotropic deck is a little bit larger.The research conclusions can provide references for the selection of the main girder of the truss-type railway bridge.%为研究桥面形式对钢桁梁柔性铁路拱桥主梁抗风性能的影响,针对明桥面及正交异性板桥面2种钢桁主梁形式,采用计算流体动力学的方法建立了简化的二维分析模型,分析了2种桥面形式下主梁附近的空间流场结构、断面静风气动力系数、涡振性能及驰振性能的差异.研究结果表明:明桥面主梁承受的静风荷载较小,驰振临界风速稍大,而正交异性板桥面主梁最低涡振风速稍大.研究结论可为桁式铁路桥主梁形式的选取提供参考.