摩擦摆式支座对地震时桥上车辆安全性的影响

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摘要

该研究建立设置了摩擦摆支座的车-轨-桥地震分析模型。其中，桥梁非线性振动分析采用OpenSEES平台，车辆模型中考虑了二系悬挂的横向止档和非线性阻尼，轮轨法向接触采用可分离的Hertz模型。用Rayleigh-Ritz法缩减了钢轨自由度。采用高效的分区异步长算法进行车-轨-桥大系统求解。分析了地震下列车通过50跨简支梁桥时的响应。发现摩擦摆支座显著降低了桥面加速度，但放大了桥面位移。设置摩擦摆支座后，桥上车辆的加速度、轮轨相对位移以及轮轨横向力均显著减小。可见，对于该研究的简支梁桥，合理设置摩擦摆式支座有利于提高地震条件下的桥上车辆安全性。

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	晋智斌1
	何金哲1
	曾永平2
	董俊2

关键词 ：车-桥耦合振动, 地震, 行车安全性, 摩擦摆式支座

Abstract：

The seismic analysis model of a vehicle-rail-bridge installed with friction pendulum bearing was established.The OpenSees platform was used to analyze the nonlinear vibration of the bridge.The vehicle model considered the effects of the lateral stopper and the nonlinear damping in the secondary suspension.The Hertz wheel-rail contact relation was adopted to simulate the wheel-rail separation and collision.The number of degree-of-freedom of the rail structure was significantly reduced by using the Rayleigh-Ritz method.The vehicle-rail-bridge system was solved by a multi-time step explicit-implicit integrated algorithm.The study shows that the friction pendulum reduces the deck acceleration, but increases the deck displacement.It is found that the simply supported beam bridge installed with pendulum bearing reduces the vehicle acceleration, wheel-rail displacement and lateral forces significantly.Thus, the pendulum bearing is favorable for the vehicle safety on the simply supported beam during earthquakes.

Key words： vehicle-bridge dynamic interaction earthquake running safety friction pendulum bearing

收稿日期: 2020-01-07 出版日期: 2021-05-28

引用本文:

晋智斌1，何金哲1，曾永平2，董俊2. 摩擦摆式支座对地震时桥上车辆安全性的影响[J]. 振动与冲击, 2021, 40(10): 25-34.
JIN Zhibin1，HE Jinzhe1，ZENG Yongping2，DONG Jun2. Effect of friction pendulum bearing on vehicle running safety on a bridge during earthquakes. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(10): 25-34.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I10/25

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