（1 清华大学土木工程安全与耐久教育部重点实验室， 北京 100084；

2 清华大学土木工程系， 北京 100084）

［摘要］为研究并揭示钢管混凝土叠合柱的钢管与管外混凝土界面的粘结抗剪能力，完成了10个试件的推出试验，其中3个试件的钢管外壁未焊接抗剪连接件，4个试件的钢管外壁焊接钢筋环、3个试件的钢管外壁焊接栓钉作为抗剪连接件。试件的破坏形态为钢管混凝土被推出，钢筋环的焊缝及栓钉的栓杆被剪断；未焊接抗剪连接件试件的实测界面抗剪粘结强度略大于1.0MPa；钢筋环直径由6mm增大为8mm、或由1根增加为2根、或栓钉直径由10mm增大为16mm，界面的受剪承载力增大；1根直径8mm的钢筋环的受剪承载力大于4根直径16mm的栓钉的受剪承载力。钢筋环及栓钉的受剪承载力试验值大于公式计算值。提出了钢管与管外混凝土界面抗剪粘结设计建议。

［关键词］钢管与管外混凝土界面； 粘结抗剪性能； 受剪承载力； 推出试验

中图分类号：TU398.1    文献标识码：A    文章编号：1002-848X(2015)03-0012-05

Test study on shearbond capacity of steel tubeout of tube concrete interface

Qian Jiaru1,2， Zhao Zuozhou1,2， Ji Xiaodong1,2

 (1 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Tsinghua University,

Beijing 100084, China;

2 Department of Civil Engineering, Tsinghua University, Beijing 100084, China)

Abstract:To study and reveal the shearbond capacity of the steel tubeout of tube concrete interface for steel tubereinforced concrete columns, pushout tests of 10 specimens were performed. Among 10 specimens, 3 specimens had no shear connector on the steel tube, 4 specimens had steel bar rings and 3 specimens had shear studs welded on the steel tube respectively as the shear connector. The failure mode of the specimens was that the concrete filled steel tube was pushed out, both the welds of steel bar ring and the stud bar were shear broken. The measured shearbond strength of the interface without shear connector was a little bit larger than 10MPa. Increasing the diameter of the steel bar ring from 6mm to 8mm, or increasing the number of the steel bar ring from 1 to 2, or increasing the diameter of the stud from 10mm to 16mm, led to an increase of the shear capacity of the interface. The shear capacity of one 8mm diameter steel bar ring was larger than those of four 16mm diameter studs. The measured shear capacities of the steel bar ring and of the stud were larger than those of the calculated values. The shearbond design recommendations for the steel tubeout of tube concrete interface were presented.

Keywords:steel tubeout of tube concrete interface; shearbond behavior; shear capacity; pushout test

*国家科技支撑计划课题(2012BAJ07B012)。

作者简介：钱稼茹，教授， Email: qianjr@mail.tsinghua.edu.cn。

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