Determination method of reasonable construction state of steel box girder cable-stayed bridge with four cable planes(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年05期
- Page:
- 49-55
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Determination method of reasonable construction state of steel box girder cable-stayed bridge with four cable planes
- Author(s):
- YUAN Peng; LI De-jian; LU Yao; LI Chuan-xi
- 1. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China; 2．School of Civil and Environment Engineering, Louisiana State University, Baton Rouge LA70803, Louisiana, USA; 3. School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410114, Hunan, China
- Keywords:
- bridge engineering; cable-stayed bridge; spatial reasonable construction state; spatial effect; strain energy of torsion
- PACS:
- U448.27
- DOI:
- -
- Abstract:
- To research reasonable construction state of steel box girder cable-stayed bridge with four cable planes, an objective function of the sum of bending and torsion strain energy was built. Cable forces optimization of cable-stayed bridge with multi-cable planes was then transformed into solving linear algebraic equations. Cable forces and their ratios under reasonable completed state were derived. Then, taking spatial cable forces of reasonable completed state as target, the reasonable construction state of steel box girder cable-stayed bridge with four cable planes was determined by forward-iteration method. Furthermore, taking the Jiashao Bridge (steel box girder cable-stayed bridge with six pylons and four cable planes) as an example, finite element models with equivalent cable force and spatial cable force at the same longitudinal position were built, and reasonable construction state and spatial structure effect of two kinds of steel box girder cable-stayed bridge with four cable planes were comparatively analyzed to verify the validity of the method. The results show that the spatial effect of steel box girder cable-stayed bridge with four cable planes is significant, and the ratio distribution of initial cable force is discrete. Ratio of cable force is slightly more than 1, nearby tower and pier due to the complicated structure configuration and force state. The ratios distribution of cable force at the other standard beam sections are from 0.85 to 0.97, the model with equal cable force causes some negative effects in structure, such as large torque in main girder and large moment in cross beam. The optimized spatial structure calculation model gets much improvement, the construction of cable-stayed bridge with steel box girder should be mainly controlled by shape of main girder and supplemented by cable forces and stress control. In order to prevent local buckling, stress control measures should be taken at the junction of pylon and girder and side span whose structure and force are complex, this method can also be applied to other cable-stayed bridges in determination of reasonable construction state.
Last Update: 2017-10-16