摘要
为检验桥跨结构的动力性能,对主跨径108m,梁拱组合体系拉萨河特大桥进行动力试验。测试其自振频率和振型;激振试验中,测试桥跨结构在列车以不同速度通过桥跨和在桥上特定位置制动时桥跨结构的应变、位移、振幅以及加速度等动力响应,并将实测结果与车桥耦合振动计算结果进行对比分析。结果表明,该组合体系具有良好的竖向刚度、横向刚度;列车在桥上运行时对桥跨结构有一定的冲击作用但并不明显,列车在桥上行车时具有良好的安全性与舒适度。该新型结构的设计理论和计算方法是合理性的,为今后设计该类组合体系铁路桥梁提供理论依据和技术参考。
In order to inspect the dynamic responses of a bridge structure, dynamical tests were made on LaSa River Bridge, a beam-arch combined bridge with the span of 108m. The frequencies and modes of natural vibration were tested. The vibration excitation was made to test the dynamic responses of strains, displacements, swings and accelerations of the structure by dynamic loads of the train passing through bridge with different uniform velocities and braking at a specifical point on the bridge with some required uniform velocities. The test results were compared with the calculated results of the vehicle-bridge coupling analysis, and indicate that the combined system has favorable vertical and transverse stiffness; the passing train has some impacting effect on the bridge but not obvious; it is of good safety and comfortable performance. The design theory and the analysis method of the new combined structure are rational. It provides theoretical and technical reference for designing this type of bridge in the future.
出处
《振动与冲击》
EI
CSCD
北大核心
2007年第11期129-132,共4页
Journal of Vibration and Shock
关键词
连续梁拱组合体系
动载试验
自振特性
动力响应
耦合振动
continuous beam-arch combined system
dynamical test
natural vibration property
dynamic responses
coupling vibration
