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《Journal of Guangxi University(Natural Science Edition)》 2011-04
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Analysis on closure scheme of multi-span continuous rigid frame bridges

CAO Shui-dong,LIN Yun,LI Chuan-xi(School of Civil Engineering and Architecture,Changsha University of Science & Technology,Changsha 410114,China)  
Because the research on the influence of different closure schemes on internal force and accumulated displacement of long-and multi-span continuous rigid frame bridges with high piers was insufficient,Wenming bridge located at the Rucheng-to-Chenzhou highway in Hunan Province was investigated to determine the influence of different closure sequences on the bridge and stre-tching modes of the prestressed bundled reinforcement.The bridge is made of 8 spans and its main span is 120 m long.The highest pier of the bridge is 110.3 m high.The results show that the diffe-rent closure sequences have little effect on structural forces,but have an obvious effect on accumulated displacement,which influences the initialize heights of girders in the process of cantilever segment construction.The different stretching modes of the prestressed reinforcement would bring a distinct effect on the stress on the lower edge of the main beam in the key sections,while little effect on the stress on the upper edge of the main beam in the key sections and other sections and the displacement of the entire structure.
【Fund】: 国家自然科学基金资助项目(50778024);; 交通部基础应用资助项目(2008-329-825-040)
【CateGory Index】: U448.23
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