【摘要】 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.更多还原

【Abstract】 Bridge vibration behavior restricts speed raise of train on railway. In this paper, problem of low frequence vibration measurement encountered in research on bridge resonance when a train passes by at a quasi-high-speed (under 160km/h) is discussed. In connection with the practical vibration measurement of Shitan steel bridge on Guangzhou-Shenzhen quasi-highspeed running line, resonace problem of bridge with span larger than 16m when train speed exceeds 120 km/h is probed. It is indicated that resonance problem of railway steel bridge excited by a train with a promoted speed deserves high attention, and the essential reason of bridge resonance is that the frequence of moving load of train is close to one of the modal frequences of bridge. The results mentioned above verify the theorectical analysis of the interaction between railway bridge and train.更多还原