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Analysis and Experimental Study about Extended Structure of Bridge

Author: ZhangZuo
Tutor: ChenZuoMin
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Continuous box girder Shrinkage and creep The basis of differential settlement Splicing structure Experimental study
CLC: U441
Type: Master's thesis
Year: 2011
Downloads: 58
Quote: 0
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Abstract


With the rapid development of China's economy , the flow of persons and goods continue to increase , and the early construction of the first batch of the highway and many low-grade roads can no longer meet the rapidly increasing volume of traffic , so the need for these road alteration or extension . Currently, China has completed part of Highway Widening and expansion work , highway alterations completed and put into operation after many universal problems , many of the overall widening of the upper part of the small - span bridge structure at the joints , such as the bridge longitudinal cracks , horizontal to produce dislocation chew on the edge , seriously affected the key to driving comfort , even the impact of traffic safety , the success or failure of the old bridge widening control factors not only the structure of the overall force performance , connected parts of the local force control is stitching factor. To solve this problem , in this paper, even Huo highway expansion project in the typical 5 × 30m span prestressed concrete continuous box girder bridges the telephoto ditch Bridge as the background , widened the old and the new box girder structure of the overall force performance and stitching parts of local stress analysis and experimental research . This study include finite element analysis method widened the old and new bridges concrete shrinkage , creep of secondary forces caused by the differences and the basis of differential settlement of differences was calculated and analyzed ; bridge is widened further examination and through on-site load test vehicle loads the bridge force condition improved , and then from the the construction angle and design point of view put forward reasonable proposals after the same type of bridge widening . The research results show that the connection time to postpone the new and old beams can effectively improve the stress state of the structure ; Newbridge basis of lateral nonlinear settlement can effectively improve the force status of the old and new bridge connection from the theory , the new bridge piers the basis of double-column pier is more reasonable ; through field experiments show that the old bridge structure forces the situation has improved to some extent .

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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