后张连续预应力筋锚固损失精确计算  

Precise Computation of Anchoring Loss in Continuous Prestressed Steel

作　　者：邵旭东[1] 夏红波[1] 程翔云[1] 

机构地区：[1]湖南大学桥梁工程研究所,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2008年第9期15-18,共4页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50778071)

摘　　要：基于摩擦理论,建立了预应力筋微段平衡方程,利用变形协调条件,推导了桥梁工程中典型的五段式预应力筋的锚固损失解析解,将计算方法推广到n段混合线形的预应力筋,并给出了反摩擦影响长度等于预应力筋全长时锚固损失的计算公式,最后通过算例将本文的计算方法与现行公路桥梁规范和铁路桥梁规范给出的方法进行了对比.结果表明,本文解析方法适用于弯曲角度较大或形状变化较大的预应力筋的锚固损失计算.Based on the theory of friction, a balance equation of micro-segment in prestessed steel was established, and then the analytical solution of the anchoring loss of five-segment-style prestressed steel was derived according to the deforming coordination principle, which can be applied to the general case in bridge engineering practice. This calculation method has been extended to the multiple-segment-style prestressed steel, and the formula is also given while the reverse-friction effect length equals the length of the steel. Finally, a comparison with the results of the formulae in current bridge codes has been done, which indicates that the analytical solution can be adopted while the prestressed steel comprises large curved arcs.

关 键 词：桥梁 后张预应力筋 锚固损失 解析解 规范 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]