后插入钢筋位置等对Ⅱ型APC接头拉伸性能影响  

Impact of position of post-installed rebar and other factors on tensile performance of typeⅡ APC connector

作　　者：余琼[1] 陈劲松 唐子鸣 郭霖 谢青海 张志 陈振海 YU Qiong;CHEN Jinsong;TANG Ziming;GUO Lin;XIE Qinghai;ZHANG Zhi;CHEN Zhenhai(College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanxi Construction Engineering Group Co.,Ltd.,Taiyuan 030006,China;Shanxi Erjian Group Co.,Ltd.,Taiyuan 030013,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]山西建筑工程集团有限公司,太原030006 [3]山西二建集团有限公司,太原030013

出　　处：《哈尔滨工业大学学报》2024年第10期101-114,共14页Journal of Harbin Institute of Technology

基　　金：上海市科技计划项目(21ZR1468300)。

摘　　要：为探究后插入钢筋位置等对Ⅱ型套筒灌浆搭接接头(简称APC接头)受力性能的影响,对36个接头进行单向拉伸试验,分析试件破坏形式、极限承载力、延性与套筒应变等,并利用ABAQUS进行数值模拟。结果表明:防偏转措施有效提高试件的极限承载力和初始刚度;接头承载力和延性主要受3种因素影响,即钢筋间距、后插入钢筋偏心程度及是否紧贴套筒布置;后插入钢筋布置于套筒中部,钢筋间距大,套筒长边约束弱,接头承载力和延性降低;后插入钢筋偏心布置,易产生弯曲变形,接头承载力和延性降低;后插入钢筋紧贴套筒布置易产生灌浆缺陷,接头承载力和延性降低;两钢筋紧贴对称布置于长轴时,接头承载力和延性最大;极限荷载时,套筒短边侧纵向应变为拉应变,但存在受压趋势,套筒长边侧纵向应变为压应变;套筒长边侧环向应变绝对值基本大于短边侧,小于套筒屈服应变。模拟试件的破坏形态、极限承载力等与试验结果吻合较好,验证了模型的可靠性。钢筋位置不同时,极限荷载最小值约为最大值的80%。To investigate the influences of parameters such as the position of post-installed rebar on the mechanical behaviors of a Type Ⅱ grouted sleeve lapping connector named APC connector(all vertical members precasted in concrete structures),a unidirectional tensile test was conducted on 36 specimens.The failure mode,ultimate bearing capacity,ductility and sleeve strain of the specimens were studied,and ABAQUS was used for numerical simulation.Test results showed that the use of anti-deflection measures effectively improved the ultimate bearing capacity and initial stiffness of the specimens.The bearing capacity and ductility of the connector were mainly influenced by three factors,namely the spacing of the steel bars,the eccentricity of the post-installed rebar,and whether the post-installed rebars were arranged tightly against the sleeve.When the post-installed rebars were arranged in the middle of the sleeve with a larger spacing between the rebars,the restraint provided by the longer side of the sleeve was weaker,resulting in a decrease in the bearing capacity and ductility of the splice.When the post-installed rebars was eccentrically positioned,it was prone to bending deformation,resulting in reduced connector bearing capacity and ductility.When the post-installed rebars was placed in close proximity to the sleeve,it was susceptible to grouting defects,resulting in reduced connector bearing capacity and ductility.When the rebars were symmetrically and tightly arranged on the long axis,the specimens exhibit the maximum bearing capacity and ductility.At the ultimate load,the longitudinal strain on the short side of the sleeve was tensile strain,but there was a compression trend,while the longitudinal strain on the long side of the sleeve was compressive strain.The absolute value of the circumferential strain on the long side of the sleeve was basically greater than that on the short side but smaller than the yield strain of the sleeve.The failure modes and ultimate bearing capacity of the simulated specimens wer

关 键 词：Ⅱ型APC接头 搭接连接 钢筋位置 拉伸性能 数值模拟 

分 类 号：TU375[建筑科学—结构工程]