| 天津永和大桥合龙段拆除后的主梁线形调整 |
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| 引用本文： | 李宏江,李万恒,张劲泉,王江,王荣石.天津永和大桥合龙段拆除后的主梁线形调整[J].公路交通科技,2009,26(6). |
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| 作者姓名： | 李宏江 李万恒 张劲泉 王江 王荣石 |
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| 作者单位： | 1. 交通部公路科学研究院,北京,100088
2. 天津市政公路管理局,天津,300170 |
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| 基金项目： | 交通部西部交通建设科技项目 |
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| 摘 要： | 天津永和大桥为5孔一联、主孔跨径260m、双塔双索面、塔墩固结、连续呈漂浮体系的Pc斜拉桥。与中跨合龙段置换相匹配，利用拆除合龙段后形成两半桥的时机，通过调索来改善主梁线形是国内既有PC斜拉桥维修的一个先例。通过对比分析合龙段拆除后状态与原桥竣工状态在桥面线形、索力等结构性能上的差异，并依据中跨合龙段拆除前已然存在的中跨局部下挠量，确立了主梁线形调整的目标和调索幅度，利用平面杆系有限元计算分析拟定并优选了调索方案，提出了主梁线形调整的施工控制原则。施工监测结果表明，所有调索步骤完成后，主梁线形调整最终达到了预期目标，调整后的索力更趋于均匀，调整过程兼顾了主梁混凝土应力、塔位以及劲性骨架轴力的变化，保证了结构的安全．
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| 关 键 词： | 桥梁工程 线形调整 调索 PC斜拉桥 拆除合龙段 |
Adjustment of Alignment of Main Girder after Removal of Closure Segment in Tianjin Yonghe Bridge |
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| LI Hongjiang,LI Wanheng,ZHANG Jinquan,WANG Jiang,WANG Rongshi.Adjustment of Alignment of Main Girder after Removal of Closure Segment in Tianjin Yonghe Bridge[J].Journal of Highway and Transportation Research and Development,2009,26(6). |
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| Authors: | LI Hongjiang LI Wanheng ZHANG Jinquan WANG Jiang WANG Rongshi |
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| Institution: | 1.Research Institute of Highway;Ministry of Communications;Beijing 100088;China;2.Tianjin Municipal Highway Administration Bureau;Tianjin 300170;China |
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| Abstract: | Tianjin Yonghe Bridge is a prestressed concrete cable-stayed bridge which has one continuous and floatable structural system with 5 spans,double pylons,double cable planes and fixed with the piers.The length of its main span is 260 meters.Accompanied with replacement of the closure segment in the midspan,after removing the closure segment and thus forming two half bridges,the alignment of main girder was improved by means of adjusting cable forces,which is a precedent in maintenance of existing prestressed ... |
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| Keywords: | bridge engineering alignment adjustment cable force adjustment prestressed concrete cable-strayed bridge removing the closure segment |
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