上跨软土深基坑干线铁路钢格构柱便桥结构性能研究

发布时间：2018-11-17 21:03

【摘要】：宁波车站改建工程中临时便桥设计采用的连续刚构双线铁路便桥为国内首创。必须满足上跨软土深基坑干线铁路便桥动力性能评估的需要,以确保客货列车安全平稳通过便桥结构。本文在总结分析国内外临时便桥工作性能及车桥耦合振动分析已有研究成果的基础上,对车桥系统的空间耦合振动进行了分析。针对工程跨越软土深基坑,且必须保证既有铁路线路的正常安全运行的工程特点,计算分析了深基坑不同施工状态、不同便桥结构方案的结构动力特性,系统阐述了钢格构柱便桥结构自身的动力性能。而后,采用随机振动理论,动力仿真了客货列车以限定时速通过有连续墙支撑便桥结构(状态II)的全过程,全面分析了列车运营性能和便桥结构的动力响应,并在95%保证率基础上与现场实测值进行了对照。最后,模拟计算了不同速度运行的客货列车与考虑桩基弹性的钢筋混凝土板梁—钢格构柱系统的空间耦合振动响应。结合我国现有规范及研究成果,在统计意义上综合评估了对应最大挖土深度的连续墙支撑便桥结构(状态V)的竖、横向刚度;揭示了列车与钢格构柱便桥结构的耦合振动机理,提出了优化便桥结构设计的建议。
[Abstract]:The continuous rigid frame double-line railway bridge is the first one in Ningbo station reconstruction project. It is necessary to meet the needs of evaluating the dynamic performance of the trunk railway bridge of deep foundation pit over the soft soil in order to ensure the passenger and cargo trains to pass through the bridge structure safely and smoothly. On the basis of summarizing and analyzing the performance of temporary bridge at home and abroad and the analysis of vehicle-bridge coupling vibration, the spatial coupling vibration of vehicle-bridge system is analyzed in this paper. In view of the engineering characteristics that the project spans the soft soil deep foundation pit and must ensure the normal and safe operation of the existing railway lines, the structural dynamic characteristics of the deep foundation pit under different construction conditions and different bridge structure schemes are calculated and analyzed. The dynamic performance of steel latticed column bridge is systematically expounded. Then, by using random vibration theory, the whole process of passenger and freight train passing through the bridge structure (state II) with continuous wall at a limited speed is simulated, and the train operation performance and the dynamic response of the bridge structure are analyzed. On the basis of 95% guarantee rate, it was compared with the field measured value. Finally, the spatial coupled vibration responses of passenger and freight trains with different speeds and reinforced concrete beam-steel lattice column systems with elastic pile foundation are simulated. Combined with the existing codes and research results in our country, the vertical and lateral stiffness of the continuous wall supporting bridge structure (state V) corresponding to the maximum excavation depth is comprehensively evaluated in the statistical sense. The mechanism of coupling vibration between train and steel latticed column bridge structure is revealed, and some suggestions for optimizing the structure design of the bridge are put forward.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.13

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