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Non-stationary random vibration of bridges under vehicles with variable speed

机译：变速车辆下桥梁的非平稳随机振动

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摘要

Most researchers assumed the road surface inputs as stationary random process in time domain when studying vehicles with variable speed. This assumption was made to avoid the complexity of the non-stationary random processes. This paper presented a new method of analyzing the non-stationary random response of bridges. Using the covariance equivalence technique, the non-stationary random responses of wheels in time domain were obtained, and thus a new method of analyzing the non-stationary random response of bridges was developed. A two-axle vehicle model and three bridge models were analyzed, namely, a single-span uniform Bernoulli-Euler beam, a three-span stepped beam, and a three-span continuous non-uniform bridge deck. The bridge-vehicle coupling equations were established by combining the equations of motion of both the bridge and the vehicle using the displacement relationship and the interaction force relationship at the contact points. The numerical results indicated that the responses of the tires induced by the road roughness are the non-stationary process, and the amplitudes of responses change as the vehicle velocity varies. Using the responses of the tires as the inputs to study the non-stationary vibration of bridge-vehicle system with variable speed one can obtain more accurate solutions.
机译：大多数研究人员在研究变速车辆时都将路面输入作为时域的平稳随机过程。进行此假设是为了避免非平稳随机过程的复杂性。本文提出了一种分析桥梁非平稳随机响应的新​​方法。利用协方差等效技术，获得了车轮在时域上的非平稳随机响应，从而提出了一种分析桥梁非平稳随机响应的新​​方法。分析了两桥车辆模型和三桥模型，即单跨均匀伯努利-欧拉梁，三跨阶梯梁和三跨连续非均匀桥面。通过使用接触点处的位移关系和相互作用力关系，结合桥梁和车辆的运动方程，建立了桥梁与车辆的耦合方程。数值结果表明，路面不平整引起的轮胎响应是非平稳过程，响应幅度随车速的变化而变化。利用轮胎的响应作为输入来研究变速桥车辆系统的非平稳振动，可以获得更准确的解决方案。

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  • 来源
    《Engineering Structures》 |2010年第8期|P.2166-2174|共9页
  • 作者

    Xinfeng Yin; Zhi Fang; C.S. Cai; Lu Deng;

  • 作者单位

    College of Civil Engineering, Hunan University, Changsha, 410082, China School of Civil Engineering, Changsha University of Science and Technology, 45 Chiling Road, Tianxin Distr, Changsha, 410076, China;

    rnCollege of Civil Engineering, Hunan University, Changsha, 410082, China;

    rnDepartment of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA;

    rnDepartment of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    vehicle; bridge; interaction; variable speed; non-stationary random process;

    机译：车辆;桥;相互作用;变速非平稳随机过程;

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