一种汽车撞击作用下桥上列车运行安全快速评估方法研究  

Fast evaluation method for safety of train operation on bridge under impact of cars

作　　者：崔堃鹏 杨传杰 韩玉婷 宁占金 杨日亮 关岩鹏 夏超逸[3] CUI Kunpeng;YANG Chuanjie;HAN Yuting;NING Zhanjin;YANG Riliang;GUAN Yanpeng;XIA Chaoyi(China Fire and Rescue Institute,Beijing 102202,China;Shanghai Huace Navigation Technology Ltd.,Shanghai 201703,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中国消防救援学院,北京102202 [2]上海华测导航技术股份有限公司,上海201703 [3]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动与冲击》2024年第15期51-55,62,共6页Journal of Vibration and Shock

基　　金：国家重点研发计划项目(2020YFC1511600);国家自然科学基金(51878036);贵州省科技支撑项目资助(黔科合支撑[2024]一般133)。

摘　　要：针对跨线铁路桥梁遭遇汽车撞击后可能诱发的桥上列车运行安全问题,选取一座在役32 m跨度T形截面简支梁桥为工程背景,采用敲击试验和数值模拟相结合的方法,提出了一种基于传递函数的快速评估方法。该方法通过力锤敲击试验,采集敲击力时程和敲击作用下桥梁关键位置动力响应时程。将敲击力作为输入变量,以桥梁动力响应作为输出变量,求出桥梁结构的传递函数。将汽车撞击力时程进行快速傅里叶变换,与传递函数进行复数点乘,对其结果进行傅里叶逆变换,得到汽车撞击的桥梁动力响应时程。通过与有限元模型计算结果进行对比,验证了基于传递函数的快速计算方法的适用性。在工程领域内,该方法避免了大量重复性的有限元计算以及破坏性试验,可以快速推导出桥梁遭遇汽车撞击后动力响应,并实现对桥上列车运行安全的快速评估。Here,aiming at potential safety issues of train operation on a cross-line railway bridge after encountering car collision,a 32 meter-span T-shaped simply supported beam bridge in service was taken as the engineering background,a fast evaluation method based on transfer function was proposed using a combination of impact tests and numerical simulation.This method could use force hammer impact tests to collect time histories of impact force and dynamic response time histories of key positions of a bridge under impact.Impact force was taken as input variable and bridge dynamic responses was taken as output variables to solve bridge structure transfer function matrix.Fast Fourier transform(FFT)was performed for time histories of car impact forces,the transfer function matrix was dot-multiplied by input vector,inverse Fourier transform(IFFT)was performed for the obtained output vector to achieve dynamic response time histories of bridge impacted by car impacts.The applicability of the transfer function-based fast calculation method was verified by comparing its results to those obtained with finite element(FE)model.It was shown that in engineering field,this method avoids a large number of repetitive FE calculations and destructive tests;it can quickly derive dynamic responses of bridge after being hit by cars,and realize fast evaluation of train operation safety on bridge.

关 键 词：汽车撞击 运行安全 动力响应 传递函数 快速评估 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3