准高速行车下铁路桥梁振动特性的试验研究
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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.
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.
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.
引文
[1]曹学琴,刘必胜,吴鹏贤.桥梁结构动力分析.第1版.北京:中国铁道出版社,1987:70—116
[2]许慰平,程庆国.大跨度铁路桥梁车桥空间耦合振动研究.中国铁道科学,1989,10(2):12—26
[3]杨学山,王友琴,黄振平.超低频振动测量中振动参量及仪器的选择.地震工程与工程振动,1993,13(1):72—76
[4]谢毅.低频绝对振动测量与时限信号恢复.[学位论文].北京:清华大学,1995
[5]谢毅,严普强.用地震式低频振动传感器测量桥梁动挠度.清华大学学报,1994,34(5):48—56
[2]许慰平,程庆国.大跨度铁路桥梁车桥空间耦合振动研究.中国铁道科学,1989,10(2):12—26
[3]杨学山,王友琴,黄振平.超低频振动测量中振动参量及仪器的选择.地震工程与工程振动,1993,13(1):72—76
[4]谢毅.低频绝对振动测量与时限信号恢复.[学位论文].北京:清华大学,1995
[5]谢毅,严普强.用地震式低频振动传感器测量桥梁动挠度.清华大学学报,1994,34(5):48—56
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