吴小宝，林峰，王涛

 (同济大学建筑工程系， 上海 200092)

 

［摘要］作为预制装配整体式混凝土结构关键技术之一，套筒灌浆连接主要用于连接该结构中竖向构件的钢筋。为研究龄期（1，4，7，28d）和钢筋种类（HRB500和HRB400）对钢筋套筒灌浆连接受力性能的影响，制作36个试件进行单调拉伸和单向重复拉伸试验。研究表明，连接发生钢筋刮犁式拔出和拉断两类破坏。首周内连接的承载力和变形随龄期增长迅速发展，7d时趋于稳定。采用HRB500钢筋连接的28d承载力高于HRB400钢筋连接，但均稍低于相应钢筋的承载力。连接的变形与钢筋种类没有明显关系。

［关键词］套筒灌浆连接； 灌浆料龄期； 钢筋种类； HRB500

中图分类号：TU375      文献标识码：A      文章编号：1002-848X(2013)14-0077-06

 

Wu Xiaobao, Lin Feng, Wang Tao

(Department of Building Engineering, Tongji University, Shanghai 200092, China)

 

Abstract: Grout sleeve splicing is mainly applied for connection of steel bars embedded in vertical members of integral prefabricated assembled concrete structures. In order to understand effects of grout age（1,4,7,28d）and types of steel bars（HRB500，HRB400）on mechanical behavior of grout sleeve splicing for reinforcing bars, 36 specimens were fabricated and tensioned with electro-hydraulic servo testing machine monotonically and repeatedly. It is found that two categories of failure pattern may happen, i.e. pullout or fracture of a bar. Moreover, the load bearing capacity and deformation of the splicing develops quickly in the first week with the increasing of grout age. The load bearing capacity of the splicing at 28 days using the steel bar type of HRB500 is higher than that of HRB400, however, both are slight lower than the ones corresponding to the ultimate strengths of steel bars, respectively. The types of steel bars show no significant effect on deformation of the splicing.

Keywords: grout sleeve splicing; grout age; steel bar type; HRB500

*同济大学土木工程学院光华基金课题。

通讯作者：林峰，博士，副教授，Email: lin_feng@tongji.edu.cn。

 

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