补灌修复后钢筋套筒灌浆连接性能试验研究
Experimental study on mechanical properties of grout sleeve splicing of rebars after supplementary grouting
赵洋 1毛诗洋 1孙彬 1金庆波 1赵东晖1
作者信息
- 1. 中国建筑科学研究院有限公司,北京 100013
- 折叠
摘要
为研究补灌修复后的钢筋套筒灌浆接头在地震作用下的力学性能,制作了 4 种不同初始灌浆饱满度的大直径半灌浆套筒接头试件,再采用 2 种不同强度的灌浆料补灌修复,对补灌修复后接头试件力学性能进行试验研究.结果表明:补灌后接头试件的残余变形和抗拉强度均能满足现行规范要求;因受到套筒内壁和钢筋表面残留浮浆的影响,补灌后试件的残余变形较初始灌浆饱满的试件增大;经反复拉压循环荷载作用后,灌浆料对钢筋的锚固性能被削弱,再进行抗拉强度试验时,部分试件发生装配端钢筋拔出破坏;对于初始灌浆饱满度缺陷相同的试件,采用更高强度补灌材料修复的试件力学性能未能明显提升.
Abstract
To study the mechnical properties of grout sleeve splicing of rebars after supplementary grouting under earthquake action,four large-diameter semi-grouting sleeve joint specimens with different initial grouting plumpness were fabricated,and two kinds of materials with different strengths were used for supplementary grouting.Experimental study on mechanical properties of joint specimens after supplementary grouting was carried out.The results show that residual deformation and tensile strength of grout sleeve splicing could meet the requirements of current standards.Due to the influence of residual grounting material on the inner wall of the sleeve and the surface of steel rebar,the residual deformation of the specimen after supplementary grouting is larger than that of the specimen with full initial grouting.After repeated tension and compression loading,the anchorage of grout to rebars was weakened which leads that part of the rebar was pulled out from sleeve in the tensile test.For the specimens with the same initial grouting fullness defects,the mechanical properties of the specimens repaired with higher strength supplementary grouting materials have not been significantly improved.
关键词
灌浆饱满度/补灌修复/半灌浆套筒/抗拉强度/残余变形Key words
grouting fullness/supplementary grouting/semi-grouting sleeve/tensile strength/residual deformation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据