| 大跨度预应力混凝土梁桥预应力损失及敏感性分析 |
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| 引用本文： | 李准华,刘钊.大跨度预应力混凝土梁桥预应力损失及敏感性分析[J].世界桥梁,2009(1). |
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| 作者姓名： | 李准华 刘钊 |
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| 作者单位： | 1. 中交公路规划设计院有限公司,北京,100088
2. 东南大学土木工程学院,江苏,南京,210096 |
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| 摘 要： | 预应力损失估计不足是目前大跨度预应力混凝土梁桥出现下挠、开裂等病害的主要原因之一.简要对比中美几种规范并结合一座悬臂灌注施工的大跨度桥梁,对悬臂束和合龙束的预应力损失规律进行定量分析和探讨,同时还进行预应力损失对桥梁挠度和应力状态的敏感性分析.研究表明,若预应力损失计算偏小,则会导致对桥梁内力和挠度计算的较大失真.
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| 关 键 词： | 预应力混凝土梁桥 预应力损失 挠度 敏感性 |
Analysis of Prestressing Loss and Sensitivity of Long Span Prestressed Concrete Beam Bridge |
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| LI Zhun-hua,LIU Zhao.Analysis of Prestressing Loss and Sensitivity of Long Span Prestressed Concrete Beam Bridge[J].World Bridges,2009(1). |
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| Authors: | LI Zhun-hua LIU Zhao |
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| Abstract: | One of the major causes leading to the deteriorations like the deflection and cracking of current long span prestressed concrete (PC) beam bridge is the underestimation of prestressing loss. In this paper,several kinds of the Chinese and American codes for prestressing loss are briefly compared and in a case of a long span PC beam bridge constructed by the cantilever casting method,the laws of the prestressing loss of cantilever strands and closure strands are quantitatively analyzed and studied and the sen... |
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| Keywords: | prestressed concrete beam bridge prestressing loss deflection sensitivity |
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