考虑高铁简支梁桥下部结构冻融病害及横向变位影响的车桥系统动力响应分析

发布时间：2018-01-11 22:22

本文关键词：考虑高铁简支梁桥下部结构冻融病害及横向变位影响的车桥系统动力响应分析　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着我国高速铁路事业的不断发展,越来越多的高速铁路规划与建设将穿越严寒冻土地区。而在该地区高速铁路桥梁运营过程中,季节性冻融作用对桥梁下部结构变位、基础强度和稳定性以及高速列车运行安全性的影响规律尚不明确,以上问题正引起广泛关注并有待开展进一步深入研究。本文以哈大客运专线为工程背景,通过理论分析、现场测试、数值模拟计算的方法,开展了以下研究工作:1.对目前严寒地区高速铁路桥梁服役状态及列车运行安全性受冻融作用影响问题及其研究现状进行了综述,总结分析了铁路桥梁下部结构冻融病害及其机理。2.研究了严寒地区冻融循环作用下高速铁路桥梁下部结构的变位规律。以哈大客运专线某一多跨简支梁桥为研究对象,在完整冻融周期内对典型水中桥墩的墩顶变位进行了定期测试,对典型陆上桥墩的墩顶变位进行了实时监测。统计变位数据并进行规律分析,结果表明:严寒地区冻融作用下高速铁路桥梁下部结构变位存在周期性变化规律,且墩底存在的不均匀冻胀对下部结构变位影响较大。3.以车桥耦合动力分析理论为基础编制了相关的Matlab计算程序,建立了车桥耦合动力分析模型。详细地阐述了其中车辆模型、桥梁模型、轨道不平顺、轮轨相互作用关系及车桥系统动力方程的求解方法。4.研究了桥梁下部结构横向变位及冻融病害对车桥系统动力响应及列车运行安全性的影响。以车桥耦合动力分析模型为基础,考虑桥梁下部结构横向变位及冻融病害影响,设置不同工况计算分析了车桥系统动力响应。研究表明:桥梁下部结构横向变位对车桥系统动力响应影响显著;由冻融病害引起的桥墩基底刚度劣化对桥梁横向动力响应影响较大。
[Abstract]:With the continuous development of the cause of China's high-speed railway, high-speed railway planning and construction will be more and more through the cold permafrost regions. In the operation process of the high-speed railway bridge in the region, effects of seasonal freezing and thawing of the substructure displacement, foundation strength and stability and safe operation of high speed train influence is not clear the above problems, is causing widespread concern and needs to be further studied. In this paper, the Harbin Dalian railway as the engineering background, through theoretical analysis, field test, numerical simulation method, carried out the following research work: 1. of the current high-speed railway bridge service state of freezing cold area and train operation safety problems and thawing effect the research status is reviewed, summarized and analyzed on the cold area of freeze-thaw cycle under the action of high melting diseases and mechanism of.2. freeze the lower part of the structure of railway bridge A variable speed of railway bridge substructure. A multi Harbin Dalian passenger dedicated line span girder bridge as the research object, in the complete freeze-thaw cycle of typical water of pier top displacement of the periodic testing of typical land of pier top displacement of the real-time monitoring, analysis, statistical data and the results show that the freezing cold area of high-speed railway bridge substructure thawing deformation exist periodic variation, uneven frost and the bottom of the pier on the lower part of the structural displacement influence.3. to vehicle bridge coupling dynamic analysis theory based on the preparation of the Matlab program, establish the analysis model of vehicle bridge coupling. Described in detail in which the vehicle model, bridge model, track irregularity,.4. method for solving the dynamic equations of the relationship and interaction between wheel and rail bridge system of horizontal bridge substructure Position and effect of freeze-thaw damage on the running safety of the vehicle bridge dynamic response of the system. In order to train and vehicle bridge coupling dynamic analysis model, considering the lateral variation of bridge substructure and freeze-thaw effects of diseases, set different conditions are calculated and analyzed. The results show that the dynamic response of vehicle bridge system: horizontal bridge structure influence on dynamic response the vehicle bridge system is significant; from the bottom of bridge piers freeze-thaw diseases caused by the degradation of stiffness has great influence on the dynamic response of bridge lateral.

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.71;U441.3

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