大跨度斜拉桥索塔锚固区环向钢束预应力损失分析与试验研究

摘要

Looped prestressing tendons have been widely used in the pylon anchorage zone of long span cable-stayed bridge .The calculation of prestress loss is an important task during the design process .Through a full-scale model exper-iment of the pylon anchorage zone at Lanqi Songhua River Bridge in Jilin City ,this paper analyzed the properties of the loss calculation of looped prestressing tendons ,the friction ,prestress loss ,elongation .friction coefficient and deviation coefficient of the theoretical calculation of the prestress loss were also measured ,which were compared with the theoretical calculation .%环向预应力筋锚固形式在大跨度斜拉桥中得到广泛应用，其预应力损失计算是设计过程中必须考虑的一个重要环节。通过对吉林省兰旗松花江斜拉桥索塔锚固区的足尺模型试验，分析了环型钢束预应力损失计算的特点，进行了环向预应力钢束孔道摩阻试验、伸长量试验等试验研究，测得了用于预应力损失理论计算的摩擦系数和偏差影响系数，并对实测伸长量与理论计算值进行了比较和分析。