地錨式預應力混凝土獨斜塔斜拉橋安全性能研究
[Abstract]:Ground anchor prestressed concrete single inclined tower cable-stayed bridge is a new type of composite cable-stayed bridge developed gradually in recent years. The inclined tower can balance part of the weight of the main beam, make the force of the structure more reasonable, and the inclined tower can achieve better landscape effect. However, the stability of this type of bridge during the construction process is poor, the structure system is novel, the force is complex, and the literature on the safety performance of this kind of bridge is relatively few. Bridge workers urgently need to understand the mechanical characteristics and safety performance of ground-anchored single-tower cable-stayed bridge. Therefore, it is very necessary to analyze and study the safety performance of this kind of bridge. Taking a ground anchor prestressed concrete single inclined tower cable-stayed bridge as the engineering background, this paper sums up and summarizes the theory and analysis method of the safety performance of the cable-stayed bridge by consulting a large number of relevant documents. The solid element model and beam element model of the cable-stayed bridge are established by using ANAYS finite element software, and the numerical simulation of the cable-stayed bridge is carried out. In this paper, the maximum cantilever stage and the second deck paving stage are selected as the typical construction stages, and the stability and ultimate bearing capacity of the typical construction stage are analyzed considering the influence of nonlinear factors. In this paper, the stress characteristics of cable-stayed bridge under design load in operation stage are studied, and the ultimate bearing capacity of cable-stayed bridge under different working conditions is calculated. The influence of vehicle load and vehicle bias load is considered in the analysis. The safety factor and failure form of cable-stayed bridge under different working conditions are obtained. In this paper, cable fracture, inclined tower angle, beam spacing and structure system are selected as the influencing factors to analyze the influence of different parameters on the ultimate bearing capacity of cable-stayed bridge. The results show that the stable safety coefficient of cable-stayed bridge is high and the safety performance is good. In the operation stage, the stress state of the structure is reasonable under the action of design load. Considering the different distribution modes of vehicle load, the bridge has a large safety coefficient when it reaches the ultimate bearing capacity, and a large safety reserve for the cable-stayed bridge. The influence of cable fracture on the ultimate bearing capacity of cable-stayed bridge is greater than that of main span cable. The ultimate bearing capacity of the cable-stayed bridge decreases with the decrease of the inclined angle of the inclined tower, and increases first and then decreases with the increase of the inclined angle of the inclined tower. The distance between beams has an important effect on the ultimate bearing capacity of cable-stayed bridges under the action of vehicle deflection. The rigid frame system should be preferred for the single-tower prestressed concrete cable-stayed bridges with ground anchors.
【學位授予單位】:長安大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U448.27
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