空腹式網架人行天橋靜力性能及其振動舒適性研究
[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.
【學位授予單位】:天津大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U441.3
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