车桥耦合振动高速铁路典型桥梁动力系数研究  

Study on the Dynamic Coefficient Law of Typical Bridges of High-Speed Railway Based on Vehicle-Bridge Coupling Vibration

作　　者：吴大宏 屠嘉杨 苏伟 孙树礼 余志武[2,3] 毛建锋[2,3] Wu Dahong;Tu Jiayang;Su Wei;Sun Shuli;Yu Zhiwu;Mao Jianfeng(China Railway Design Corporation(CRDC),Tianjin 300308,China;School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Central South University Changsha 410075,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308 [2]中南大学土木工程学院,湖南长沙410075 [3]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《华东交通大学学报》2022年第2期17-26,共10页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(51708558,52078485);湖南省自然科学基金项目(2020JJ5740)。

摘　　要：国内外规范目前定义的桥梁动力放大系数无法全面反映各复杂因素对桥梁动力性能的影响,在设计阶段,“逢桥必算”成为常态。针对此问题,该研究通过建立高速列车-轨道-桥梁系统耦合振动模型,对33座桥梁在不同列车类型、不同车速荷载下的动力特性进行仿真分析。基于概率统计学原理,引入“谱函数”的概念,以结构自振周期为指标,在一定保证率的前提下拟合得到了适合计算车桥耦合下桥梁结构动力放大系数谱的函数表达式。另选取了10座桥梁进行车桥耦合仿真计算分析,以验证动力放大系数谱方法的适用性,结果表明,该方法具有一定的保证率和适用性。最后,提出了一些改进该方法精度的建议。At present,the dynamic amplification coefficient of bridges defined in domestic and foreign codes cannot fully reflect the influence of various complex factors on the dynamic performance of bridges.In the design stage,it is a normal state for every bridge to be calculated.Accordingly,this article established the high-speed train-trackbridge coupled vibration system model to analyze the dynamic characteristics of 33 bridges under different vehicle types and speed loads.Based on the probability statistics theory,the concept of spectral function was introduced,taking the natural vibration period of structure as the index.The function expression suitable for calculating the dynamic amplification coefficient spectrum of the bridge structure under vehicle bridge coupling was obtained at a certain guarantee rate.Another 10 bridges were selected for vehicle-bridge coupling calculation to verify the applicability of the dynamic amplification coefficient spectrum method.The results show that the method has certain guarantee rate and applicability.Finally,some suggestions are given to improve the accuracy of the method.

关 键 词：车桥耦合模型 动力放大系数 谱函数 

分 类 号：U441[建筑科学—桥梁与隧道工程] U24[交通运输工程—道路与铁道工程]