空腹式网架人行天桥静力性能及其振动舒适性研究

发布时间：2019-01-11 08:15

【摘要】：近年来，随着城市市政交通基础设施与高速公路网络的快速发展，跨越快速交通要道的人行天桥的建设也日益增多。受使用条件、景观要求和材料性能等因素的影响，人行天桥的结构形式呈现多样化的特征。网架结构作为一种发展成熟的空间结构，被成功应用于人行天桥，，形成了一种独创的空腹式网架人行天桥结构。对在役网架人行天桥的静力性能和人行舒适性进行测试和评估，对于完善此类桥梁的设计分析方法，指导其运营期维护等具有重要的理论意义和实用价值。本文以天津市津滨轻轨中山门站人行天桥为工程背景，通过对在役空腹式网架人行天桥的外观检测、静载试验及其计算对比分析、人致振动试验及其数值模拟分析，检验在役网架人行天桥的安全性与舒适性，为此类结构在桥梁中的应用及其运营维护提供理论指导与实践经验。本文主要工作包括： (1)对投入使用6年的螺栓球节点的空腹式网架人行天桥主体结构进行外观检查、病害原因分析和静载试验，以验证该桥的静力安全性和设计合理性。 (2)建立空腹式网架人行天桥的有限元模型，进行自振特性分析与人群步履荷载激励下的动态响应分析，为人行舒适性评定奠定基础。 (3)进行多种人行激励条件及环境激励条件下的动态加速度与速度响应测试，并依据国内外相关人行天桥舒适性评价标准进行不同行人工况下的舒适性评定。本文方法可在同类桥梁工程测试和分析中应用推广，为人行天桥设计、分析及其运营维护提供理论指导与实践经验。
[Abstract]:In recent years, with the rapid development of urban traffic infrastructure and highway network, the construction of pedestrian overpasses across the expressway has been increasing day by day. Affected by the conditions of use, landscape requirements and material properties, the structure of pedestrian overpass presents a variety of characteristics. As a mature spatial structure, the grid structure has been successfully applied to the pedestrian overpass and formed a unique structure of the empty web space truss footbridge. The test and evaluation of the static performance and comfort of the existing truss footbridge is of great theoretical significance and practical value in improving the design and analysis method of this kind of bridge and guiding its maintenance during operation. This paper takes the pedestrian overpass of Zhongshanmen Station of Tianjin Jinbin Light Rail as the engineering background, through the inspection of the appearance, static load test and calculation comparison analysis, the artificial vibration test and its numerical simulation analysis of the existing empty stomach grid truss footbridge. The safety and comfort of the existing truss footbridge are tested, and the theoretical guidance and practical experience are provided for the application of this kind of structure in the bridge and its operation and maintenance. The main work of this paper is as follows: (1) the main body structure of the hollow space truss footbridge, which has been put into use for 6 years, is inspected, the cause of the disease is analyzed and the static load test is carried out. In order to verify the static safety and design rationality of the bridge. (2) the finite element model of the empty web truss footbridge is established, and the natural vibration characteristic analysis and the dynamic response analysis of the crowd under the action load are carried out, which lays the foundation for the evaluation of the pedestrian comfort. (3) the dynamic acceleration and velocity response under various conditions of pedestrian excitation and environmental excitation are tested, and the comfort assessment of pedestrian overpass under different pedestrian conditions is carried out according to the domestic and foreign standards for evaluating the comfort of pedestrian overpasses. This method can be applied to the test and analysis of similar bridges, and provide theoretical guidance and practical experience for the design, analysis and operation and maintenance of footbridges.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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