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铁路桥梁振动特性是制约铁路提速的一个重要因素.本文结合广州—深圳准高速铁路线石滩64m钢桥振动特性的实际测试,深入研究列车提速至大于120km/h的行车条件,跨度大于16m桥梁的共振问题.研究表明,提速列车作用下铁路钢桥的共振响应是不容忽视的,桥梁发生共振的根本原因是列车移动荷载对桥梁的激励频率与桥梁的某阶有载模态频率接近.上述结论验证了车桥系统耦合作用的理论分析.
The vibration characteristics of railway bridges are an important factor to restrict the speed of railway.In this paper, based on the actual test of the vibration characteristics of 64m steel bridge of Guangzhou-Shenzhen quasi-high-speed railway line Shitan, the driving conditions of the train speeding to more than 120km / h are studied in depth, The research shows that the resonance response of railway steel bridge under the action of speed-increasing train can not be neglected, and the fundamental reason of bridge resonance is that the excitation frequency of train moving load to the bridge approaches that of the first-order mode of bridge.The above- The conclusion verifies the theoretical analysis of the coupling effect of the axle system.