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Structural Engineering and Mechanics Volume 31, Number 2, January30 2009 , pages 137-152 DOI: https://doi.org/10.12989/sem.2009.31.2.137 |
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Theoretical analysis of Y-shape bridge and application |
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Lu Peng-zhen, Zhang Jun-ping, Zhao Ren-da and Huang Hai-yun
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| Abstract | ||
| Mechanic behavior of Y-shape thin-walled box girder bridge structure is complex, so one can not exactly hold the mechanical behavior of the Y-shape thin-walled box girder bridge structure through general calculation theory and analytical method. To hold the mechanical behavior better, based on elementary beam theory, by increasing the degree of freedom analytical method, taking account of restrained torsiondistortion angledistortion warp and shearing lag effect at the same time, authors obtain a thin-walled box beam analytical element of 10 degrees of freedom of every node, derive stiffness matrix of the element, and code a finite element procedure. In addition, authors combine the obtained procedure with spatial grillage analytical method, meanwhile, they build a new analytical method that is the spatial thin-walled box girder element grillage analysis method. In order to validate the precision of the obtained analysis method, authors analyze a type Y-shape thin-walled box girder bridge structure according to the elementary beam theory analytical method, the shell theory analytical method and the spatial thin-walled box girder element grillage analysis method respectively. At last, authors test a type Y-shape thin-walled box girder bridge structure. Comparisons of the results of theory analysis with the experimental text show that the spatial thin-walled box girder element grillage analysis method is simple and exact. The research results are helpful for the knowledge of the mechanics property of these Y-shape thin-walled box girder bridge structures. | ||
| Key Words | ||
| structure of Y-shape bridge; increasing of freedom degree; stiffness matrix; space grillage analysis. | ||
| Address | ||
| Lu Peng-zhen; School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Zhang Jun-ping; School of Civil Engineering of Guangzhou University, Guangzhou 510006, China Zhao Ren-da; School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Huang Hai-yun; School of Civil Engineering of Guangzhou University, Guangzhou 510006, China | ||