中文摘要：

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．

英文摘要：

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.