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。
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 prestress may cause lower prestressing friction loss and unacceptable error which lead to larger effective prestress value than actual value; （2） considering the spatial effect of prestress can reduce the error caused by the simplified method and get more precise result.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第6期84-86,92,共4页
Journal of Highway and Transportation Research and Development
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
bridge engineering
3D curved prestressing tendon
nonuniform B- spline
loss of prestress
geometric parameter
