| 体外预应力组合梁桥预应力损失计算 |
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| 引用本文： | 蔡建军,陶慕轩,聂建国.体外预应力组合梁桥预应力损失计算[J].桥梁建设,2011(6). |
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| 作者姓名： | 蔡建军 陶慕轩 聂建国 |
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| 作者单位： | 1. 山东高速青岛公路有限公司,山东 青岛,266061
2. 清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京,100084 |
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| 摘 要： | 为准确计算体外预应力组合梁桥预应力损失值,在已有研究的基础上,总结导致该类型梁桥预应力损失的6个关键因素(预应力筋回缩和锚具变形、预应力筋与转向块之间的摩擦、预应力筋松弛、混凝土徐变、混凝土收缩、温度变化),并分别推导了相应的简化计算方法.计算预应力筋回缩和锚具变形以及摩擦引起的预应力损失时采用材料力学方法和平衡原理；计算预应力筋松弛引起的预应力损失时参考预应力混凝土梁的相关经验公式并结合试验结果进行修正；计算混凝土徐变、收缩以及温度效应引起的预应力损失时近似采用力法原理和等效荷载法.
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| 关 键 词： | 组合梁桥 体外预应力 预应力损失 力法 等效荷载法 |
Calculation of Prestress Loss of Externally Prestressed Composite Girder Bridges |
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| CAI Jian-jun
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TAO Mu-xuan
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NIE Jian-guo.Calculation of Prestress Loss of Externally Prestressed Composite Girder Bridges[J].Bridge Construction,2011(6). |
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| Authors: | CAI Jian-jun TAO Mu-xuan NIE Jian-guo |
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| Institution: | CAI Jian-jun1,TAO Mu-xuan2,NIE Jian-guo2(1.Shandong Hi-Speed Qingdao Highway Co.,Ltd.,Qingdao 266061,China,2.Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education,Department of Civil Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | To accurately calculate the prestress loss values of externally prestressed composite girder bridges,the six critical factors(the prestressing tendon withdrawal and anchor deformation,friction between prestressing tendon and deviator,prestressing tendon relaxation,concrete creep,concrete shrinkage and temperature changes) that cause the prestress loss of such type of the bridges are summarized and the corresponding simplified calculation methods are respectively derived on the basis of the existing research... |
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| Keywords: | composite girder bridge external prestress prestress loss force method equivalent load method |
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