高速铁路简支梁桥参数变化对竖向共振影响分析

摘要

Based on the finite element analysis theory of the vertical vibration on train-slab track-bridge system, this paper obtained the vertical dynamic equation of high-speed train-slab track-bridge system,with the help of the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-posi-tion"rule for formulating matrices.The inflence of the railway simply supported beam bridge structure parameter on the bridge vertical resonance was analyced voriation of the numerical results show that bridge’s span,damp-ing,stiffness and quality parameters changes have an important impact on bridge vertical resonance.The results can provide a reference for optimizing the High-speed railway Simply-supported bridge structure and improving the safety factor of train operation.%基于列车－轨道－桥梁系统有限元分析理论，利用弹性系统动力学总势能不变值原理及形成系统矩阵的“对号入座”法则，得到列车－板式轨道－简支梁桥系统竖向矩阵形式的运动方程，分析高速铁路简支梁桥结构参数变化对桥梁竖向共振的影响。计算表明桥梁质量、刚度、阻尼比等参数变化对简支梁桥共振有重要影响。该结果对于优化高速铁路简支桥梁结构设计参数，提高列车运行安全系数具有参考价值。