新型灌浆套筒的约束机理及约束应力分布

发布时间：2018-03-21 23:37

  本文选题：预制混凝土结构　切入点：灌浆套筒　出处：《哈尔滨工业大学学报》2015年12期 　论文类型：期刊论文

【摘要】：为降低预制装配混凝土结构中的钢筋连接成本,利用无缝钢管,采用冷滚压工艺研制了一种新型钢筋连接用灌浆套筒,通过接头单向拉伸试验,主要研究了套筒的约束机理及约束应力分布.结果表明:该新型接头能够满足JGJ107—2010规定的单向拉伸强度要求;套筒在灌浆料硬化阶段产生的初始约束应力与钢筋、灌浆料、套筒的力学特性及接头尺寸有关,并随灌浆料膨胀率的增加呈线性增长;套筒变形段对灌浆料的平均约束应力大于套筒光滑段,变形段约束主要来自内壁环肋处相互挤压力的径向分力,光滑段对灌浆料的约束取决于灌浆料劈裂变形的大小.
[Abstract]:In order to reduce the cost of steel bar connection in precast assembly concrete structure, a new grouting sleeve for steel bar connection was developed by using seamless steel tube and cold rolling technology. The uniaxial tensile test of the joint was carried out. The constraint mechanism and stress distribution of the sleeve are studied. The results show that the new joint can meet the requirements of uniaxial tensile strength stipulated by JGJ107-2010, and the initial restraint stress and the reinforcement and grouting material produced by the sleeve during the grouting hardening stage. The mechanical properties of the sleeve are related to the size of the joint, and it increases linearly with the increase of the expansion ratio of the grouting material, and the average restraint stress of the deformation section of the sleeve on the grouting material is greater than that of the smooth section of the sleeve. The constraint of deformation section mainly comes from the radial component force of extrusion force at the inner wall ring rib, and the constraint of smooth section on grouting material depends on the size of split deformation of grouting material.
【作者单位】： 东南大学土木工程学院;
【基金】：国家科技支撑计划项目(2011BAJ10B03)
【分类号】：TU755.3

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