车桥碰撞冲击谱研究  

Impact spectrum of vehicle-bridge collision

作　　者：李嗣同 亓兴军 尹壮飞 LI Sitong;QI Xingjun;YIN Zhuangfei(School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Luqiao Group Co.,Ltd.,Jinan 250021,China)

机构地区：[1]山东建筑大学交通工程学院,济南250101 [2]山东省路桥集团有限公司,济南250021

出　　处：《振动与冲击》2020年第9期229-234,共6页Journal of Vibration and Shock

基　　金：山东省交通科技计划项目(编号2009Y10);山东省高等学校土木结构防灾减灾协同创新中心项目(编号XTM201904)。

摘　　要：针对非线性有限单元法研究车桥碰撞的动力时程响应所存在的耗时费力,适用面不广泛等缺点,参照地震动反应谱的概念提出车桥碰撞冲击谱的计算方法,通过建立7种"车辆-刚性墙"碰撞系统有限元模型并对其关键字文件进行求解,得到63条撞击力时程曲线,采用谱分析的方法求解出撞击力时程作用下单自由度体系的位移放大系数,分析得出车辆在不同速度下的放大系数与结构周期之间的统计规律,通过数学方法对周期-位移放大系数曲线进行拟合,得出车桥碰撞冲击谱的数学表达式。并提出了有使用意义的车桥碰撞冲击谱的使用方法及应用建议。Aiming at the shortcomings of nonlinear finite element method such as time-consuming,effort-consuming and narrow applicability when analysing the dynamic time-history responses to vehicle-bridge collision.A calculation method for the impact spectrum of vehicle-bridge collision was proposed with reference to the concept of seismic response spectrum.63 impact force time-history curves were obtained by constructing 7 finite element models of“vehicle-rigid wall”collision systems and solving their key files.By using the method of spectral analysis,the displacement amplification factor of a single-degree-of-freedom system under impact force was solved.The statistical relation between the amplification factor and the structural period of vehicles at different speeds was observed.The mathematical expressions for the impact spectrum of vehicle-bridge collision were thus obtained by fitting the period-displacement amplification factor curves.Finally,the suggestions for the practical use of impact spectrum were proposed.

关 键 词：车桥碰撞 撞击力时程 单自由度体系 位移放大系数 冲击谱 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]