Ⅱ型套筒灌浆搭接接头单向拉伸力学性能研究  

Mechanical Properties of TypeⅡGrouted Sleeve Lapping Connectors Under Uniaxial Tension

作　　者：尹喜慧 田川江 余琼[2] 郭霖 谢青海 许志远 YIN Xihui;TIAN Chuanjiang;YU Qiong;GUO Lin;XIE Qinghai;XU Zhiyuan(The Ninth Engineering Co.,Ltd.of CFHEC of CCCC,Guangzhou 511300,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanxi Construction Engineering Group Co.,Ltd.,Taiyuan 030006,China;Shanghai Chest Hospital,Shanghai Jiao Tong University School of Medicine,Shanghai 200030,China)

机构地区：[1]中交一公局第九工程有限公司,广州511300 [2]同济大学土木工程学院,上海200092 [3]山西建筑工程集团有限公司,太原030006 [4]上海市胸科医院/上海交通大学医学院附属胸科医院,上海200030

出　　处：《建筑钢结构进展》2024年第12期126-138,共13页Progress in Steel Building Structures

摘　　要：为研究Ⅱ型套筒灌浆搭接接头(简称APC接头)单向拉伸力学性能,基于ABAQUS软件提出一种带肋钢筋精细化显式动态模型,模拟分析了钢筋位置、套筒壁厚、搭接长度等对试件破坏模式、承载力、延性和套筒应变等的影响。结果表明:试件破坏形式、荷载-位移曲线、承载力和延性均与试验结果吻合较好,验证了精细化模型的准确性;后插入钢筋紧贴预留钢筋布置于套筒轴线时试件极限承载力和延性最大,后插入钢筋紧贴套筒偏心布置时试件极限承载力最小;近钢筋侧套筒中部纵向应变值大于远钢筋侧应变值,而环向应变则相反;试件承载力随套筒壁厚的增大而增大,建议套筒长边及短边壁厚分别取为8 mm和4 mm;套筒长边壁厚小于8 mm时,增大套筒壁厚可有效降低套筒环向应变;钢筋发生拉断破坏前,随着搭接长度的增加,试件承载力及延性增大;随着搭接长度的增加,套筒短边纵向应变先增大后减小,长边环向应变逐渐减小;C30混凝土可满足接头的防偏转要求;提出了Ⅱ型APC接头的黏结强度计算公式及临界搭接长度公式,研究成果可为Ⅱ型APC接头的设计提供理论基础。In order to investigate the uniaxial tensile mechanical properties of typeⅡgrouted sleeve lapping connector(referred to as APC connector),a detailed explicit dynamic model of ribbed steel bar was proposed using ABAQUS software.The effects of steel bar position,sleeve wall thickness and lap length on the failure mode,bearing capacity,ductility and sleeve strain of the specimens were simulated and analyzed.The results show that the failure mode,load-displacement curve,bearing capacity and ductility of the specimens are in good agreement with the test results,which verifies the accuracy of the detailed model.The ultimate bearing capacity and ductility of the specimens are maximized when the post-installed rebar is arranged on the axis of the sleeve close to the pre-embedded rebar,while the ultimate bearing capacity of the specimen is minimized when the postinstalled rebar is eccentrically arranged close to the sleeve.The longitudinal strain at the mid-section of the sleeve near the steel bar is greater than that of the far side of the steel bar,while the circumferential strain exhibits an opposite trend.The bearing capacity of the specimen increases with the increase of wall thickness of the sleeve,and it is suggested that the thickness of the long side and the short side of the sleeve should be 8 mm and 4 mm,respectively.When the thickness of the long side of the sleeve is less than 8 mm,increasing the thickness of the sleeve can effectively reduce the circumferential strain of the sleeve.Prior to tensile fracture of steel bars,the bearing capacity and ductility of the specimen increase with the increase of lap length.As the lap length increases,the longitudinal strain of the short side of the sleeve initially increases and then decreases,while the circumferential strain of the long side gradually decreases.The C30 concrete is able to meet the anti-deflection requirements of the connector.The formulae for the bond strength and critical lap length of the typeⅡAPC connector were proposed,which can provide a theor

关 键 词：钢套筒约束 钢筋搭接 数值模拟 单向拉伸 力学性能 

分 类 号：TU398.9[建筑科学—结构工程]