Considering the problems of train’s running safety on the overpass railway bridge that may be threaten by the vehicle collision, a typical 32m T-shaped simply-supported bridge is selected as analytical case. Combining impact test and numerical simulation, a fast evaluation method based on transfer function is proposed. Through the hammer knocking test, the time histories of the hammer forces and the dynamic responses of the bridge are collected. Taking the knocking force as the input variable and the bridge dynamic response as the output variable, a transfer function of the bridge structure is obtained. The time history of vehicle collision force is transformed into frequency domain by using the fast Fourier transform (FFT), and it is dot-multipleid by the proposed transfer function. Then the Inverse Fast Fourier Transform (IFFT) is used, to get the time history of the bridge under vehicle collision. The applicability of the fast evaluation method based on the transfer function is verified, by comparing with the calculation results of the finite element model. When applied in engineering field, this method avoids a large number of repetitive finite element calculations and destructive tests on structure, and can quickly derive the dynamic response of the bridge after vehicle collision, and realize a fast assessment of the train’s running safety on the railway bridge.
Key words
vehicle impact /
operation safety /
dynamic response /
transfer function /
fast assessment
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References
[1] 张景峰. 船舶—桥梁碰撞动力分析及船撞作用下桥梁结构可靠度研究[D]. 成都：西南交通大学，2016.
ZHANG Jingfeng. The dynamic analysis of vessel-bridge collision and the reliabity of bridge structures subjected to vessel collison[D]. Chengdu: Southwest Jiaotong University，2016.
[2] 路国运,陈鹏程.薄柔H型钢柱抗侧向冲击性能研究[J].太原理工大学学报.2019,(6):736-742.
LU Guoyun, CHEN Pengcheng. Study on Performance of H-shaped Columns with Large Width-thickness Ratios under Transverse lmpact[J]. Journal of Taiyuan University of technology, 2019, 50(6):736-742.
[3] Xia C.Y., Lei J.Q., Zhang N., De Roeck G. et al. Dynamic analysis of a coupled high-speed train and bridge system subjected to collision load[J]. Journal of Sound and Vibration. 2012, 331(10): 2334―2347.
[4] 夏超逸,雷俊卿,张楠.流冰撞击力作用下列车-简支梁桥耦合振动分析[J].振动与冲击.2012,(13):154-158.
Xia Chaoyi, LEI Junqing, ZHANG Nan. Coupled vibration analysis for train and simply-supported bridge system subjected to floating-ice collision[J]. Journal of Vibration and Shock, 2012, 31(13): 154―158.
[5] 崔堃鹏,夏超逸,刘炎海,等.高速铁路桥墩汽车撞击力的数值模拟与特性分析[J]. 桥梁建设, 2013, 43(6):57-63.
CUI Kunpeng, Xia Chaoyi, LIU Yanhai, et al. NumericalSimulation and Characteristic Analysis of Vehicle Collision Forces in High-Speed Railway Bridge Pier[J]. Bridge Construction, 2013, 43(6):57-63.
[6] 崔堃鹏. 汽车撞击荷载及其作用下高速列车与桥梁系统动力响应与列车运行安全研究[D]. 北京：北京交通大学，2015.
CUI Kunpeng. Research of motor collision loads and dynamic responses of high speed train-bridge system and running safety evaluation of trains subjected to motor collision loads[D]. Beijing: Beijing Jiaotong University, 2015.
[7] 崔堃鹏,夏禾,夏超逸,等.汽车撞击桥墩瞬态撞击力的等效静力计算[J].振动与冲击.2014,(4):48-53.
CUI Kunpeng, XIA He, XIA Chaoyi, et al. Equivalent static force calculation methods for transient impact force of a vehicle in collision with piers[J]. Journal of Vibration and Shock, 2014, 33(4): 7-13.
[8] 崔堃鹏,夏禾,夏超逸,等.横向撞击力对铁路桥梁及行车影响的模型实验研究[J].振动与冲击.2014,(9):48-54.
CUI Kunpeng, XIA He, XIA Chaoyi, et al. Model test for effect of lateral collision force on railway bridge and vehicle running safety[J]. Journal of Vibration and Shock,2014, 33(10): 7-13.
[9] Sherif EI-Tawil P.E.M., ASCE, et al. Vehicle collision with piers[J]. Journal of Bridge Engineering, 2005, 10(3): 345-353.
[10] 雷正保,李丽红,雷沐羲,等.新型柔性护栏碰撞安全性仿真分析及实车验证[J].振动与冲击.2013,(22):28-31.
LEI Zhengbao, LI Lihong, LEI Muxi, et al. Simulation analysis and real car validation for crashworthiness of a new flexible safe fence[J]. Journal of Vibration and Shock, 2013, 32(22): 28-31.
[11] 吴广发,赵希禄.汽车前纵梁碰撞吸能特性的优化设计[J].机械设计与研究.2011,(4):118-120.
WU Guangfa, ZHAO Xilu. Optimum Design for Crash Energy Absorption ability of Car Front Side Member[J]. Machine Design & Research, 2011, 27(4): 118-120.
[12] 陈吉清,周鑫美,饶建强,等.汽车前纵梁薄壁结构碰撞吸能特性及其优化的研究[J].汽车工程.2010,(6):486-492.
CHEN Jiqing, ZHOU Xinmei, Rao Jianqiang, et al. A research on the impact energy absorption characteristics and optimization of thin-walled structure of vehicle front rail. Automotive Engineering，2010, 32(6): 486-492.
[13] 高速铁路设计规范（TB10621 -2014）[S]. 北京：中国铁道出版社. 2014.
Code for Design of High Speed Railway（TB10621 -2014）[S]. Beijing：China railyway publishing house. 2014.
[14] 公路桥涵设计通用规范（JTG D60-2015）[S]. 北京：人民交通出版社. 2015.
General Specifications for Design of Highway Bridges and Culverts（JTG D60-2015）[S]. Beijing：China Communication Press. 2015.
[15] 日本铁道构造物等设计标准[S]. 铁道综合技术研究所. 1992.
Design standards for Japanese railway structures, etc[S]. Railway Technology Research Institute. 1992.
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