缓黏结预应力钢绞线的试验研究  

Experiment and Research on Retard-Bonded Prestressed Steel Strands

作　　者：冯新[1] 周先雁[1] 

机构地区：[1]中南林业科技大学土木工程与力学学院,长沙市410004

出　　处：《公路》2011年第10期67-70,共4页Highway

基　　金：湖南省建设科技计划项目;项目编号2006468-28

摘　　要：缓黏结预应力混凝土是近20年出现的一种新型独特预应力体系,其关键是缓黏结预应力筋周围缓凝材料是否满足要求。通过手工的方式制作了缓黏结预应力钢绞线,并对缓黏结预应力钢绞线进行了摩阻试验研究,得到了当缓凝砂浆的缓凝时间为11d,在第9d张拉缓黏结预应力钢绞线时的静张拉摩阻力、摩擦系数μ和偏差系数κ,以及预应力施加完成后40d内缓黏结预应力钢绞线的应力变化和缓黏结部分预应力混凝土梁反拱度变化规律。为这一新型预应力体系的实际应用提供了理论参考依据。Retard-bonded prestressed concrete which has appeared in recent twenty years is a new and distinctive prestressed system.The key of retard-bonded prestressed concrete is whether the retarding materials around prestressed tendons would satisfy its demand.So retard-bonded prestressed steel strands are made by manual work in this paper,and experiment and research on friction of retard-bonded prestressed steel strands are carried out.Initial setting time of retarding mortar is 11 days,and retard-bonded prestressed steel strands are tensioned on the 9th day in the paper.The static friction resistance,friction factor μ and deviation factor κ are obtained from the test when retard-bonded prestressed steel strands are tensioned.And the stress variation of retard-bonded prestressed steel strands both with the camber variation of retard-bonded partially prestressed concrete beams are acquired from the test during 40 days immediately after prestress transfer.It provides the theoretical reference for the actual project application of the new retard-bonded prestressed concrete system.

关 键 词：缓黏结预应力 钢绞线 预应力 损失 试验 研究 

分 类 号：TU378.8[建筑科学—结构工程]