Interface bond force transfer mechanisms and its influence analysis between shape steel and high-strength concrete
Ying Wudang1,2 Chen Zongping2,3
1. Tongji University, Shanghai 200092, China;
2. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
3. Key Laboratory of Disaster Prevention and Structure Safety of the Ministry of Education,Guangxi University, Nanning 530004, China
Abstract：In order to reveal the interface bond force transfer mechanism between shape steel and high-strength concrete, concrete compressive strength, concrete cover thickness, shape steel embedment length, transverse stirrup ratio and layout of shear stud were considered as variable parameters, 12 steel reinforced high-strength concrete specimens were designed and quasi-static push-out testing was conducted. Failure process and crack propagation of specimens were observed, load- slip curves of free end and loading end of specimens were obtained, the interface bond transfer mechanisms between shape steel and high-strength concrete was expounded according to test results, the influencing rules of each factor to bond slip performance were elaborately analyzed, some related computational formulas of bond strength were discussed and the utility formulas were put forward. The key results show: Interface ultimate bond strength could be increased to some extension by increase transverse stirrup ratio and concrete cover thickness; The relationship between shape steel embedment length and ultimate bond strength are not significant once shape steel embedment length reaches a certain value; For the high-strength concrete, the ultimate bond strength may be reduced to some degree along with the increase of concrete-strength; Bond slip performance could be effectively improved by setting up shear stud; The largest proportion of bond force is chemical bond force, frictional fore is smaller and bite force is the smallest.
应武挡 陈宗平. 型钢高强混凝土界面黏结传力机理及影响因素分析[J]. 土木工程学报, 2016, 49(9): 53-63.
Ying Wudang Chen Zongping. Interface bond force transfer mechanisms and its influence analysis between shape steel and high-strength concrete. 土木工程学报, 2016, 49(9): 53-63.
