后张预应力筋束孔道摩阻损失测试与探讨

Testing and Discussion on Friction Loss of Post-tensioned Tendons Duct

通过对武广高铁客运专线花都特大桥48m+80m+48m后张法预应力混凝土连续箱梁上的3孔预应力筋束的孔道摩阻损失试验,介绍了预应力筋束孔道摩阻试验的试验方法,采用最小二乘法分析,得到预应力筋束与孔道间的摩阻系数μ和偏差系数k。为该桥的梁体预应力张拉施工提供依据,也为预应力筋束的预应力损失计算提供一定的参考。

Through duct friction loss test for prestressed tendons of three-span post-tensioned concrete box girders of 48 ＋ 80 ＋ 48m Huadu Bridge of Wuhan-Guangzhou High-speed Railway, the test method has been introduced, tendon friction coefficient μ between tendon and duct and deviation factor k have been obtained by means of least square method. Basis and references for both prestressing construction and tendons friction loss calculation have been provided.