循环荷载作用下新型钢筋套筒灌浆连接结构性能  

Structural Performance of Innovative Grout Sleeve Splicing for Rebars under Cyclic Loading

作　　者：郑永峰[1,2] 郭正兴[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]山东建筑大学土木工程学院,山东济南250101

出　　处：《湖南大学学报（自然科学版）》2016年第11期131-140,共10页Journal of Hunan University:Natural Sciences

基　　金："十二五"国家科技支撑计划资助项目(2011BAJ10B03)

摘　　要：为降低钢筋连接成本,利用普通无缝钢管通过冷滚压工艺加工了一种新型钢筋连接用灌浆套筒,并制作了12个钢筋连接接头试件,通过反复拉压试验及单向拉伸试验研究其连接结构性能.结果表明,该连接能够满足JGJ107-2010规定的强度及变形要求;接头经过反复拉压循环加载后,钢筋极限黏结强度较直接拉伸试件约降低10%;由于套筒的约束作用,钢筋套筒灌浆连接残余黏结强度大于极限抗拉强度的50%;套筒每端内壁环肋数量不宜少于3道,并应根据接头承载力要求的提高而适当增加.To reduce the cost of bar splice, a new type of grouted sleeve was developed with standard seamless steel tube through cold rolling techniques. Based on this sleeve, twelve coupler specimens were prepared and tested under cyclic load as well as incremental tensile load. The structural performance of this novel grouted splice was then studied. The test results showed that the strength and deformation of the splices could satisfy the requirements specified in the JGJ107-2010. Due to the cyclic loads, the ultimate bond strength declined by about ten percent of the specimen strength under direct tension test. Mean- while, because of the confinement provided by the sleeve, the residual bond strength of the bond failed specimen is greater than 50 percent of the ultimate tensile strength. Moreover, it is found that the number of the concentric ribs at each side of the sleeve should not be less than three, and it should be increased properly for the improvement of tensile capacity requirement of the splice.

关 键 词：钢筋套筒灌浆连接 预制混凝土建造 循环加载 接触分析 

分 类 号：TU755.32[建筑科学—建筑技术科学]