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research-article

Dynamic responses of a four-span continuous plate structure subjected to moving cars with time-varying speeds

[+] Author and Article Information
Jing Yang

School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
jimswho@liverpool.ac.uk

Huajiang Ouyang

School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
h.ouyang@liverpool.ac.uk

Dan Stancioiu

Mechanical Engineering and Materials Research Centre, Liverpool John Moores University, Liverpool L3 3AF, UK
d.stancioiu@ljmu.ac.uk

Shancheng Cao

School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
caoshch@liverpool.ac.uk

Xuhui He

School of Civil Engineering, Central South University, Changsha, ChinaJoint International Research Laboratory of Key Technology for Rail Traffic Safety, Changsha, China
xuhuihe@csu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039799 History: Received September 04, 2017; Revised February 17, 2018

Abstract

This paper presents an experimental and theoretical study of vibration of a four-span continuous plate with two rails on top and four extra supports excited by one or two moving model cars, which is meant to represent vehicle-track-bridge dynamic interaction. Measured natural frequencies of the plate structure are used to update the Finite Element (FE) model of the structure. Four laser displacement transducers are placed on the ground to measure the displacements of the plate. A Laser-Doppler Vibrometer is used to measure the real-time speed of the moving cars which reveals that the speeds decrease with time at a small and almost constant deceleration which can affect the structural dynamic response. A fascinating experiment is the use of two cars connected in series, which is very rare and has never been done on a multi-span structure. Vibration of the plate structure excited by two moving cars separated at a distance is also measured and exhibits interesting dynamic behaviour too. A theoretical model of the whole structure is constructed and an iterative method is developed to determine the dynamic response. The numerical and the experimental results are found to agree very well, in particular when deceleration is considered in the theoretical model.

Copyright (c) 2018 by ASME
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