列车风作用下铁路跨线人行天桥舒适度评价

发布时间：2018-02-08 09:04

本文关键词： 跨线天桥列车风人行荷载动力响应舒适评价　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：在我国铁路快速发展的重要时期，铁路客站的建设也正面临着转型期带来的挑战，无论是铁路运行速度的提升、铁路公交化的变革甚至通过式站房空间的出现，，新型铁路客站已转变为城市综合交通枢纽，因此铁路跨线桥梁日益增加。列车大幅度提速产生的列车风荷载，导致临近环境空气压力产生波动，也逐渐被学者重视，列车速度越高，对周围空气的扰动就越大，产生的压力波也就越强，对列车附近建筑、设施或者人影响则越大。在铁路站房建设中，跨线人行天桥是其重要组成部分，跨线人行桥与城市人行天桥类似但有不同，主要区别是铁路跨线人行桥受到列车风荷载的作用，而目前关于考虑列车风作用的跨线人行天桥振动舒适度问题的研究还尚未有资料可查询。本文结合实际工程，应用有限元软件SAP2000，对桥梁的整体模型进行有限元模态分析，得到天桥的振型和自振频率，运用国内外对列车风特性及人行荷载的研究结果，得到沿列车运行方向先正后负、垂直于列车运行方向逐渐递减的压力变化曲线，并将其转化为风荷载模型，结合本工程特点确定合适的人行荷载模型，并进行动力响应分析。得到不同节点相应的加速度时程曲线和位移时程曲线，分析跨线桥加速度最值变化规律，分析列车风荷载对该桥的加速度影响和位移影响，结果表明，列车风荷载对桥梁的位移影响很小，最大竖向加速度在沿列车行驶方向逐渐增大，垂直于列车运行方向向两侧逐渐递减，在桥梁边缘处达到最大。对比国内外有关人行天桥舒适度评价指标和舒适度规范，选取几种典型的舒适度评价标准对本工程实例进行舒适度评价，并给出参考意见。
[Abstract]:In the important period of the rapid development of railway in our country, the construction of railway passenger station is also facing the challenges brought by the transition period, whether it is the improvement of railway running speed, the transformation of railway transit, or even the appearance of the space of railway station. The new type of railway passenger station has been transformed into a comprehensive urban transportation hub. As a result, the railway bridge beams are increasing day by day. The wind load of the train caused by the large increase in the speed of the train causes the fluctuation of the ambient air pressure in the vicinity, and has gradually been attached importance to by scholars. The higher the speed of the train, the greater the disturbance to the surrounding air, the stronger the pressure wave generated, and the greater the impact on the buildings, facilities or people nearby the train. In the construction of railway stations, the cross-line pedestrian overpass is an important part of it. Cross-line footbridges are similar to, but different from, urban footbridges. The main difference is that railway footbridges are subjected to train wind loads. At present, the research on vibration comfort degree of cross-line footbridge considering train wind action is not available. In this paper, the finite element modal analysis of the whole model of the bridge is carried out by using the finite element software SAP2000, and the vibration mode and the natural vibration frequency of the bridge are obtained. The results of the research on the train wind characteristics and the pedestrian load at home and abroad are used in this paper. The pressure change curve along the train running direction is first positive and then negative and gradually decreasing perpendicular to the train running direction. The curve is transformed into the wind load model and the suitable pedestrian load model is determined according to the characteristics of the project and the dynamic response analysis is carried out. The acceleration time history curve and displacement time history curve of different nodes are obtained, and the law of maximum acceleration change of span bridge is analyzed, and the influence of train wind load on acceleration and displacement of the bridge is analyzed. The results show that, The influence of train wind load on the displacement of the bridge is very small, the maximum vertical acceleration increases gradually along the train running direction, and the vertical direction decreases gradually to both sides of the train running direction. Compared with the domestic and foreign standards of comfort evaluation of footbridge, several typical comfort evaluation criteria were selected to evaluate the comfort of the project, and some reference suggestions were given.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.11

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