獨塔疊合梁斜拉橋空間力學(xué)行為研究
[Abstract]:With the development of transportation, the improvement of calculation theory and the progress of modern construction technology, the span of modern cable-stayed bridge is becoming larger and larger, the structure of which is more and more complicated, and the spatial effect is more obvious. The bridge accidents in recent decades show that there is a great difference between the analysis results of the whole bridge and the real mechanical behavior of the bridge structure because of neglecting the local structure of the structure. Stress concentration, shear lag and stress diffusion exist in some parts of cable-stayed bridge structure, and the safety reserve of these parts is often the key to ensure the engineering quality of this kind of structure. Therefore, it is necessary to make local fine finite element analysis of these parts on the basis of the whole bridge analysis, so as to accurately grasp the force situation. In this paper, the spatial mechanical behavior of Aojiang fourth Bridge is studied by using finite element principle on the basis of health monitoring of long-span steel-hybrid cable-stayed bridge. The main work is as follows: (1) the spatial mechanical behavior of the cable-stayed bridge with single-tower steel concrete composite beam is studied by establishing the spatial finite element model of the whole bridge. This paper mainly analyzes the internal force, stress and deformation of the structure under the action of dead load, automobile, temperature, wind load and so on. (2) on the basis of the whole analysis, the concrete shrinkage and creep are considered in the early stage of the bridge and in the later stage of the bridge. Find out the most unfavorable beam section under the most unfavorable working condition, establish the local fine finite element model of the beam segment based on the multi-scale principle, study the concrete bridge deck slab, steel longitudinal and horizontal beam, The spatial stress distribution state of steel beam longitudinal and transverse stiffening system and the mechanism of mechanical transfer between them provide the basis for fine design. (3) according to the actual construction sequence of Aojiang fourth Bridge, the whole construction process is divided into 128 construction stages. The static behavior and internal force distribution characteristics of each component in different construction stages are analyzed by simulating and calculating the construction process by means of the formal fitting analysis method, and the characteristics of the static behavior and internal force distribution of the components in different construction stages are analyzed. This paper probes into the evolution mechanism of internal force in the key part of bridge body during the whole construction and the influence of cable force on the stress and deformation of the structure during the construction process, which provides a reference for guiding the construction.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U448.27
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