Determination and Implementation of Reasonable Completion State for the Self-Anchored Suspension Bridge with Extra-Wide Concrete Girder

Applied Sciences

Li Zhu¹  Jianhui Li²  Maojun Duan²  Aiqun Li³  Zhiyuan Xia⁴  Guangpan Zhou⁵ 

[1] School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China;School of Civil Engineering, Southeast University, Nanjing 210096, China;School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;School of Science, Nanjing University of Science and Technology, Nanjing 210094, China;

关键词: self-anchored suspension bridge;    concrete girder;    reasonable completion state;    concrete shrinkage and creep;    system transformation;    multiple control;   

DOI  :  10.3390/app9122576

来源: DOAJ

【 摘 要 】

The present work is aimed at studying the determination method and implementation process of reasonable completion state for the Hunan Road Bridge, which is currently the widest concrete self-anchored suspension bridge in China. The global finite element model and the cable analytic program BNLAS were integrated. The synthesis algorithm of completion state determination was proposed. The contact relationships between the cable and saddles were captured using the refined FE discretization method. The concrete shrinkage and creep effects during the construction and operation periods were predicted using the CEB-FIP 90 model and the age-adjusted effective modulus method. The cable alignments under the free cable state, system transformation condition, and completion state were obtained. Moreover, the multiple-control method for the whole process of system transformation was proposed. The multiple parameters included the hanger tensioning force, exposed amount of hanger anchor cup, and tag line position. A detailed system transformation procedure was formulated and well preformed in the construction site. In addition, the further optimization analysis of final hanger force was conducted based on the actual completion state. The influence on the stress and geometry evolution of girder brought by the final girder alignment was investigated. The measured results of structural alignment and stress show that the target completion state was well implemented. The accuracy and efficiency of the proposed multiple-control method were verified by checking the tag line position of each step. In addition, the optimized final hanger force and girder lifting amount were obtained, which can provide feedback and reference for the construction control and service safety of the similar concrete self-anchored suspension bridges.

【 授权许可】

Unknown