大懸臂箱梁橫向預應力長期性能及配置方式研究
[Abstract]:In recent years, with the development of urban traffic, it is difficult for ordinary box girder bridge to meet the traffic demand. More and more prestressed concrete continuous beam bridges adopt large cantilever box section. In large cantilever box girder bridge, in order to avoid cracks in the top plate of box girder, transverse prestressed reinforcement is often arranged on the top of box girder. The aging of concrete caused by repeated loads in the service stage of the bridge causes the loss of transverse prestress to increase and the safety of the bridge is threatened. In this paper, taking a large cantilever continuous box girder as the engineering background, using ANSYS software to establish a spatial model, and combining with stress test and prestress loss test, the long-term performance and configuration of transverse prestressing of large cantilever continuous box girder are studied. It has certain theoretical value and engineering practical significance. The main work and achievements are as follows: 1. The finite element model of space entity is established by using ANSYS software, and the accuracy of the model of large cantilever box girder bridge is verified by comparing and analyzing with stress test. 2. The transverse prestressing loss test of large cantilever box girder is carried out, and the prestressing loss of box girder is evaluated with the theoretical calculation value. The results show that the test value of prestress loss is larger than the designed value, and the quality of pipeline hole needs to be improved. 3. Combined with the test of prestress loss, the influence of transverse prestress loss on bridge structure is analyzed. The results show that if the transverse prestressing loss of the bridge deck is too large, the bridge deck may appear tensile stress during the operation of the bridge, which will affect the crack resistance and integrity of the structure. 4. This paper analyzes the influence of different transverse prestress allocation modes on the mechanical characteristics of box girder, and puts forward a reasonable prestress configuration mode.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:U448.213;U445.57
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