淮河大桥35m先张折线形箱梁预应力损失的研究  

Research of Prestressing Loss about Huaihe River Bridge 35m Folding First-tensioned Box Beam

作　　者：刘立新[1] 安鸿飞[1] 于秋波[1] 汪小林[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2007年第4期12-15,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省交通厅资助项目(2005P338)

摘　　要：通过对35 m折线先张梁施工监测,来分析张拉横梁、反力梁的变形和转向器摩擦阻力对预应力损失的影响,以及其他情况下预应力损失.结果表明:先张折线形预应力箱梁的预应力损失的计算比后张法预应力损失的计算更准确,避免了预应力值不可靠带来的工程病害,而且先张折线形箱梁总的预应力损失值比后张法的预应力损失值要小,确保了张拉应力.分析指出混凝土的收缩和徐变引起受拉区和受压区的应力损失在先折线形箱梁总预应力损失的比重最大,所以采取办法减小混凝土的收缩和徐变是控制先张折线形箱梁总预应力损失的有效措施.Through the construction monitoring of the 35 m folding first -tensioned box beam, this paper analyzes the deformation of tensioned beam, anti - power beam and the impact of steering gear friction on the prestressed loss. The results show ： folding first - tensioned box beam in the calculation of the loss is more accurate than post - tensioned box beam, and it avoids the project diseases because of prestressed value unreliable. Moreover, the total prestressed loss of first - tensioned box beam is smaller than post - tensioned, thus ensuring the tension stress. The analysis pointed out that the loss of the compression and tensile stress caused by the concrete creep and shrinkage is the largest proportion. Therefore, the best way to control total prestressed loss is to reduce the concrete creep and shrinkage.

关 键 词：先张折线 张拉横粱 反力梁 转向器 预应力 

分 类 号：TU378.2[建筑科学—结构工程]