高速铁路车桥耦合系统地震响应分析

发布时间：2018-01-10 01:11

本文关键词：高速铁路车桥耦合系统地震响应分析　出处：《中国地震局工程力学研究所》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国铁路列车不断提速、载重日益增大、桥梁在铁路系统中的比重日益增高,研究列车与桥梁的动力相互作用已成为一个重要的课题。同时,在地震频发的当下,高速铁路地震报警系统及紧急处置系统已成为保障高铁列车地震安全性的有效技术手段,而车桥耦合系统的地震响应分析是了解高速铁路车桥系统抗震性能的基础性工作,也是高速铁路地震报警系统阈值分析的必要环节和依据。在本文中,对车桥耦合系统的动力相互作用的国内外研究现状问题进行了历史回顾和发展现状的阐述,总结了已有的研究成果和经验,建立了车桥耦合系统地震反应分析模型,较为全面地进行了地震作用下的车桥耦合振动研究。主要研究内容包括： 1)详细阐述了高速铁路桥梁在地震作用下动力响应问题研究的目的、意义、现状以及存在的问题。在以往的研究中,桥梁抗震与车桥耦合动力响应分析是两个独立的研究课题,列车在桥上运行时同时受到地震荷载的概率的增大,使得车桥耦合系统的抗震研究和地震作用下列车在桥梁上的走行性安全研究成为了重要的研究课题。 2)基于现役高速铁路桥梁的设计参数,通过Midas-Civil软件建立车桥耦合模型并进行动力特性分析。在考虑列车的作用下,车桥耦合模型的自振频率与桥梁固有频率之间存在较大差异；通过改变车辆位置、桥梁墩高及跨度等参数,得到了相应的车桥耦合模型的自振特性变化规律。 3)进行了车桥耦合系统的地震响应分析及列车运行安全性评估。通过Midas有限元模型先对车桥耦合系统进行地震反应分析,再以桥面响应为输入,加入轨道不平顺数据,计算列车的动力响应,并基于列车运行安全性指标对列车的安全性进行了评价。当改变列车运行速度与地震动加速度峰值,得到了列车运行三项安全性指标(脱轨系数、横向轮轨力、轮重减载率)的相应变化规律及安全限值。 4)采用有限元方法完成了快速移动列车荷载下桥梁结构的动力响应分析。对列车静荷载、列车动荷载、地震荷载作用时的桥面反应进行了计算分析。与地震荷载做对比,移动荷载列的贡献值虽然小但是不可忽略的；列车以不同速度过桥时,桥面节点的动力响应值会随着车速的提高而增大。
[Abstract]:As China's railway train constant speed, load increasing, the proportion of the bridge in the railway system is increasing, the power of train and bridge interaction has become an important issue. At the same time, the frequent seismic moment, high-speed railway seismic alarm system and emergency disposal system has become the guarantee of effective technical means for high iron the seismic safety of the vehicle bridge coupling system of seismic response analysis is a basic understanding of the seismic performance of bridge system of high-speed railway, high-speed railway is a necessary part of earthquake alarm threshold analysis system and the basis. In this paper, the research status at home and abroad on the dynamic interaction of vehicle bridge coupling system and reviews the history of the development of the status quo, summarizes the research results and the existing experience, established coupled system seismic response analysis model, comprehensively carried out The research on the coupling vibration of vehicle and Bridge under earthquake. The main contents include:
1) the purpose, significance, present situation and existing problems of the research on the dynamic response of the high-speed railway bridge under the earthquake action are elaborated in detail.
In the previous study, the bridge seismic and vehicle bridge coupling dynamic response analysis of two independent research projects, the train running on the bridge at the same time by the increased probability of seismic loads, the seismic research and earthquake bridge coupling system under the train on the bridge to go on for security has become an important research topic.
2) based on the design parameters of the existing high speed railway bridge, the bridge coupling model is established by Midas-Civil software and the dynamic characteristics are analyzed.
Considering the effect of train, there is a great difference between the natural frequency of vehicle bridge coupling model and the natural frequency of bridge. By changing vehicle location, pier height and span parameters, the corresponding self vibration characteristics of vehicle bridge coupling model are obtained.
3) the seismic response analysis of the vehicle bridge coupling system and the safety assessment of the train operation are carried out.
Through the Midas finite element model of vehicle bridge coupling system for seismic response analysis, and then to the deck response as input, join the track irregularity data, calculate the dynamic response of the train, and the safety index of train based on train running safety was evaluated. When the change speed and train vibration acceleration peak, got three an index of safety of the train (wheel rail lateral force, derailment coefficient, wheel load reduction rate) the corresponding changes and safety limits.
4) the dynamic response analysis of the bridge structure under the fast moving train load is completed by the finite element method.
The static load of the train, the train load, the response when earthquake load are calculated and analyzed. Compared with seismic load, moving load series contribution value is small but not negligible; train at different speeds when the bridge deck, dynamic node response value will increase as the speed increases.

【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U211.3

【参考文献】