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Analytical study on the dynamic displacement response of a curved track subjected to moving loads

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第12期14卷 867-879页

作者： Ke-fei LI Wei-ning LIU Valeri MARKINE Zhi-wei HAN School of Civil Engineering Beijing Jiaotong University Beijing MTR Construction Administration Corporation Railway Engineering Group Faculty of Civil Engineering and Geosciences Delft University of Technology

A closed-form out-of-plane dynamic displacement response of a curved track subjected to moving loads was *** track structure was modeled as a planar curved Timoshenko beam periodically supported by the double-layer spring-damping *** general dynamic displacement response induced by the moving loads along the curve on the elastic semi-infinite space was firstly obtained in the frequency domain,according to the Duhamel integral and the dynamic reciprocity *** the case of the periodic curved track structure subjected to moving loads,the dynamic displacement equation was simplified into a form of summation within the basic track cell instead of the *** transfer function for the curved track was expressed in the form of a transfer *** and series moving loads were involved in the calculation *** the verification of the analytical model,the mid-span vertical deflection of a simply support curved beam subjected to moving load was recalculated and compared with the same case in the *** research results indicate that:under the same moving loads,the displacement response of the curved track decreases slightly with the increasing track radius,and the displacement response of the curved track with the radius greater than or equal to 600 m is almost equivalent to the displacement response of the straight track;the frequency spectrum of the curved track is more abundant than that of the straight track,which may result in more wheel-rail resonance and rail corrugation in the curved lines.

关键词： Curved track Moving loads dynamic displacement Analytical solution Transfer function

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A Real-Time System for Monitoring Distant dynamic displacement of Structures

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Geo-Spatial Information Science 2008年第1期11卷 49-55页

作者： CHEN Junfeng ZHAO Wenguang LUO Hongbin LI Penghui WEN Yinping School of Civil Engineering and Mechanics Huazhong University of Science of Technology 1037 Luoyu Road Wuhan 430074 China Hubei Key Laboratory of Control Structure HUST 1037 Luoyu Road Wuhan 430074 China 不详

Based on digital image processing technique, a real-time system is developed to monitor and detect the dynamic displacement of engineering structures. By processing pictures with a self-programmed software, the real-time coordinate of an object in a certain coordinate system can be obtained, and further dynamic displacement data and curve of the object can also be achieved. That is, automatic gathering and real-time processing of data can be carried out by this system simultaneously. For this system, first, an untouched monitoring technique is adopted, which can monitor or detect objects several to hundreds of meters apart; second, it has flexible installation condition and good monitoring precision of sub-millimeter degree; third, it is fit for dynamic, quasi-dynamic and static monitoring of large engineering structures. Through several tests and applications in large bridges, good reliability and dominance of the system is proved.

关键词： dynamic displacement real-time monitoring and detecting sub-pixel system calibration dynamic tracking

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Over-height truck collisions with railway bridges:attenuation of damage using crash beams

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Earthquake Engineering and Engineering Vibration 2022年第1期21卷 237-252页

作者： Dan Xu Xinxing Yuan Ali Irmak Ozdagli Marlon Agüero Roya Nasimi Tao Wang Fernando Moreu Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina EarthquakeAdministrationSanhe 065201China Department of Civil Construction and Environmental EngineeringUniversity of New MexicoAlbuquerqueNM 87131USA Courtesy Appointment Department of Electrical and Computer EngineeringUniversity of New MexicoAlbuquerqueNM 87131USA Courtesy Appointment Department of Mechanical EngineeringUniversity of New MexicoAlbuquerqueNM 87131USA

Railway bridges are susceptible to over-height truck collisions and to address this issue,it is necessary to attenuate the effect of these impacts to ensure the safety of transportation *** study experimentally investigates the effectiveness of crash beams as a cushioning mechanism for railway bridges against ***-height truck and railway bridge impact events were simulated in a 1:5 scale *** design parameters such as the stiffness of the crash beam and the bridge supports were scaled to evaluate different levels of *** experiments were conducted with five configurations consisting of four different types of crash beams and one no-crash beam *** results show that crash beams attenuate bridge total peak dynamic displacement responses between 14.5%and 35.7%,depending on the intensity of the impact and crash beam *** addition,the results show that the average effectiveness in attenuating residual deformation for all four crash beams ranges from 43.03%to 83.40%.Finally,various designs and their effectiveness against lateral impacts with different speeds are *** overall scope of this research is to provide objective information about the design of crash beams for railway bridges based on their response to over-height truck collisions at various speeds.

关键词： railway bridge over-height truck impact attenuation crash beam dynamic displacement scaled model

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Application of Digital Image Monitoring System to Detecting a High Voltage Icing Conductor

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Geo-Spatial Information Science 2009年第1期12卷 61-65页

作者： LI Penghui ZHAO Wenguang WEN Yinping CHEN Yong HU Wei School of Civil Engineering and Mechanics Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 China

A real-time system of numeral image manipulation technology is employed to inspect the dynamic displacement of an engineering structure. First, the CCD vidicon aims at the fixed point. The image of the fixed point on the structure is gathered by a picture gathering card. By processing pictures with a self-programmed software, the real-time space coordinate of the cali- bration device can be obtained. Finally, the data is dealt with to get the movement curve, and the dynamic displacement is carried out. The system is applied to the test of a high voltage icing conductor. The result indicates that the dynamic data of the ice shedding conductor includes jumping amplitude, displacement-time curve and attenuation process.

关键词： icing conductor ice-shedding jump dynamic displacement image processing

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