大跨度铁路斜拉桥全桥索-梁相关振动研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (17) : 103-114.

论文

大跨度铁路斜拉桥全桥索-梁相关振动研究

王涛，刘德贵，黄辉

作者信息 +

Cable-beam related vibration of a long span railway cable-stayed bridge

WANG Tao, LIU Degui, HUANG Hui

Author information +

文章历史 +

摘要

为了研究大跨度铁路斜拉桥在外部动力作用下索-梁相关振动导致的拉索振动状态，开发了非线性有限元动力时程积分方法，编制了有限元计算程序。以天兴洲大桥为研究对象，建立了斜拉桥全桥2维模型。研究了在理想外激励作用下全桥发生振动时斜拉桥的索-梁相关振动特性与拉索的共振条件。分析了不同工况列车通过桥梁时，车-桥耦合动力作用对拉索的影响。研究结果表明：对于大跨度铁路斜拉桥，发生索-梁相关振动时，斜拉桥中较长拉索更容易发生大幅非线性振动，拉索的1:1主共振更容易发生，2:1参数共振发生可能性较小；列车动力作用不会使拉索达到共振条件，不会造成拉索大幅振动。

Abstract

Here, cable-beam related vibration of a long span railway cable-stayed bridge under external dynamic forces was studied.A nonlinear finite element (FE) dynamic time-history integration method was developed to compile a FE calculation program.Taking Tianxingzhou bridge in China as the study object, a 2-D full bridge FE model was built to study cable-beam related vibration characteristics of the bridge and resonance conditions of cable under ideal external excitation, and analyze effects of train-bridge coupled dynamic action on cable when train passing the bridge under different working conditions.The results showed that for a long span railway cable-stayed bridge, when its cable-beam related vibration happens, longer cables of the bridge are easy to have nonlinear vibration with large amplitude, cable’s 1∶1 main resonance is easier to happen, while the appearing possibility of its 2∶1 parametric resonance is smaller; train dynamic actions can’t make cable reach resonance condition to cause cable’s large amplitude vibration.

导出引用

王涛，刘德贵，黄辉. 大跨度铁路斜拉桥全桥索-梁相关振动研究[J]. 振动与冲击, 2019, 38(17): 103-114

WANG Tao, LIU Degui, HUANG Hui. Cable-beam related vibration of a long span railway cable-stayed bridge[J]. Journal of Vibration and Shock, 2019, 38(17): 103-114

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