| 任意空间曲线预应力筋的管道摩擦及局部偏差损失研究 |
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| 引用本文： | 周小勇,金文成,黎述亮.任意空间曲线预应力筋的管道摩擦及局部偏差损失研究[J].公路交通科技,2009,26(6). |
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| 作者姓名： | 周小勇 金文成 黎述亮 |
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| 作者单位： | 华中科技大学,土木工程与力学学院,湖北,武汉,430074;华中科技大学,控制结构湖北省重点实验室,湖北,武汉,430074 |
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| 摘 要： | 针对预应力混凝土桥梁结构，介绍了任意空间曲线型预应力筋的管道摩擦及管道局部偏差损失计算方法。通过引入非均匀B样条曲线，推导出预应力筋的管道摩擦及管道局部偏差损失的数值计算公式，该公式适用于任意空间曲线型预应力筋，并适合编程计算。算例结果表明：对于空间转角较大的空间型预应力筋，当不考虑空间效应，采用简化公式计算方法会使摩擦损失及局部偏差计算结果偏小，且误差较大，导致最终得到的有效预应力值偏大，考虑预应力空间效应可减少简化计算的误差，较精确地计算出摩擦损失及局部偏差损失。
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| 关 键 词： | 桥梁工程 空间曲线预应力筋 非均匀B样条 预应力损失 几何参数 |
Study on Loss of 3D Curved Prestressing Tendon Due to Pipeline Friction and Local Defection |
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| ZHOU Xiaoyong,JIN Wencheng,LI Shuliang.Study on Loss of 3D Curved Prestressing Tendon Due to Pipeline Friction and Local Defection[J].Journal of Highway and Transportation Research and Development,2009,26(6). |
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| Authors: | ZHOU Xiaoyong JIN Wencheng LI Shuliang |
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| Institution: | 1.School of Civil Engineering & Mechanics;Huazhong University of Science & Technology;Wuhan Hubei 430074;China;2.Hubei Key Laboratory of Control Structure;China |
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| Abstract: | The calculation method of prestress loss due to pipeline friction and local defection for 3D curved prestressing tendons in the PC bridges was introduced.With help of nonuniform B-Spline curve,a numerical formula for calculating the loss of prestressing tendons due to pipeline friction and local defection was proposed,which is also suited for programming.The result shows that for 3D tendons with wider cornerite(1) the loss of prestress using simplified formula without consideration of spatial effect of pres... |
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| Keywords: | bridge engineering 3D curved prestressing tendon nonuniform B-spline loss of prestress geometric parameter |
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