后张预应力钢筋施工张拉阶段弹性伸长量的简易计算

A Simplified Formula for Calculating Elastic Extension Amount of Prestressed Reinforcement.Bar by Posttensioning Method

本文根据预应力摩擦损失计算中常用的假定,提出了后张预应力钢筋在施工阶段弹性伸长量的简化计算方法,导出了圆弧形和折线形预应力钢筋弹性伸长量的简化计算公式。文中同时给出了按精确计算法和平均拉力法计算预应力钢筋弹性伸长量的公式,并分析了各种摩擦损失假定所带来的误差。

On the basis of supposition commonly used for calculating friction loss,this article gives a simplified formula in calculating the amount of elastic extension at the stage of construction,and derives the amount of elastic extension from calculating arched or bent prestressed reinforcement bar as well.This article also puts forward accurate calculating and average tension method and makes an analysis of errors caused by various suppositions of friction loss.