(1 河北化工医药职业技术学院, 石家庄 050030; 2 华北理工大学建筑工程学院, 唐山 063210;3 河北工业大学土木与交通学院, 天津 300401)

摘要: 为研究钢筋偏心(垂直偏心和斜向偏心)对铸造半灌浆套筒连接性能的影响,设计制作了 18 个铸造半灌浆套筒连接试件,通过拉伸试验研究钢筋偏心对试件破坏形态、强度与变形性能、灌浆料损伤程度的影响. 结果表明,钢筋垂直偏心和斜向偏心对接头极限承载力影响较小,主要影响接头的变形性能,且出浆口所在截面为最危险截面;钢筋垂直偏心使贴近钢筋一侧筒壁应变大于另一侧对称位置应变,且钢筋斜向偏心试件具有相同的应变分布规律;钢筋居中试件灌浆料损伤深度最小,斜向偏心试件损伤深度最大,垂直偏心试件次之. 最后,建立了铸造半灌浆套筒连接接头极限承载力分析模型,接头极限承载力计算结果与试验结果吻合良好,误差小于 10%.

关键词: 钢筋偏心; 铸造半灌浆套筒; 损伤深度; 单向拉伸; 连接接头; 极限承载力; 分析模型

中图分类号:TU758. 14 文献标志码:A 文章编号:1002-848X(2023)08-0078-08

DOI:10. 19701 / j. jzjg. LS220066

Experimental study on connection performance of cast semi-grouted sleeve considering influence of rebar eccentricity

SU Lipo1, WANG Zhanwen2, LIU Ziye2, CHE Wenpeng3

(1 Hebei College of Chemical and Pharmaceutical Technology, Shijiazhuang 050030, China;2 College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan 063210, China;3 School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China)

Abstract: In order to study the influence of rebar eccentricity ( vertical eccentricity and oblique eccentricity) on theconnection performance of cast semi-grouting sleeve, 18 cast semi-grouting sleeve connection specimens were designed andfabricated, and the influence of rebar eccentricity on the failure modes, strength and deformation properties, damage degreeof grout were studied by tensile test. The results show that the vertical eccentricity and oblique eccentricity of the rebar havelittle influence on the ultimate bearing capacity of the splices, which mainly affect the deformation performance of thesplices, and the section where the slurry outlet located is the most dangerous section. The vertical eccentricity of the rebarmakes the strain of the cylinder wall close to the rebar larger than that of the symmetrical position on the other side, and therebar oblique eccentric specimens have the same strain distribution law; The damage depth of grout of rebar centeredspecimen is the smallest, that of oblique eccentric specimen is the largest, and that of vertical eccentric specimen is thesecond. Finally the analytical model was established to predict the ultimate bearing capacity of cast semi-grouted sleeveconnection splices. The calculated results of the splices are in good agreement with the experimental results, and the erroris less than 10%.

Keywords:rebar eccentricity; cast semi-grouted sleeve; damage depth; uniaxial tensile; connection splices; ultimatebearing capacity; analytical mode

∗国家自然科学基金项目(51678236),河北省自然科学基金项目(E2020209056).

第一作者:苏立坡,硕士,高级工程师,主要从事工程结构等研究,Email: liposu2021@ 163. com.

[引用本文] 苏立坡,王占文,刘子业,等. 考虑钢筋偏心影响的铸造半灌浆套筒连接性能试验研究[ J]. 建筑结构,2023,53(8):78-85. SU Lipo,WANG Zhanwen,LIU Ziye,et al. Experimental study on connection performance of castsemi-grouted sleeve considering influence of rebar eccentricity[J]. Building Structure,2023,53(8):78-85.