Bond-slip relation between rebars and ECC under high strain rate load
CUI Shuangshuang1,2, MENG Yao2, CHEN Weihong3, SUN Hao2
1.Key Laboratory of Underground Engineering of Universities in Fujian Province, Fujian University of Technology, Fuzhou 350118, China; 2.School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China; 3.School of Civil Engineering, Fuzhou University, Fuzhou 350116, China
Abstract：The use of ECC instead of concrete can improve the progressive collapse resistance of structures under accidental loads but bond-slip may occur between reinforcement and ECC during the stage of large deformation of the catenary. In this paper, based on the Hopkinson Pressure Bar (SHPB) test device, dynamic bond-slip behavior of steel bar and ECC is tested. The influence of strength grade, strain rate and diameter of steel bar on ultimate bond strength, stiffness and slip are analyzed. Mean bond-slip curves of steel bar and ECC under high strain rate are obtained. The dynamic increase factor DIF is calculated by comparing dynamic bond-slip curves with static bond-slip curves. Further, the distribution of bond stress and relative slip at different anchorage positions are obtained by placing strain gauge in the slot of reinforcement, and the bond position function is proposed. Finally, according to the test results, the average bond slip constitutive force of rebar and ECC is obtained, and then the dynamic bond-slip constitutive force considering the influence of anchorage position is obtained by multiplying the bond position function, which provides experimental basis and theoretical reference for ECC structural member design and finite element analysis.
崔双双1,2 孟瑶2 陈伟宏3 孙浩2. 高应变率荷载作用下钢筋与ECC的粘结滑移关系研究[J]. 振动与冲击, 2024, 43(1): 71-82.
CUI Shuangshuang1,2, MENG Yao2, CHEN Weihong3, SUN Hao2. Bond-slip relation between rebars and ECC under high strain rate load. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(1): 71-82.
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