Bond-slip relation between rebars and ECC under high strain rate load

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (1) : 71-82.

CUI Shuangshuang1,2, MENG Yao2, CHEN Weihong3, SUN Hao2

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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.

Key words

high strain rate load / rebar-ECC bond slip / Hopkinson Press Bar (SHPB) test / position function / bond- slip constitutive relation

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CUI Shuangshuang1,2, MENG Yao2, CHEN Weihong3, SUN Hao2. Bond-slip relation between rebars and ECC under high strain rate load[J]. Journal of Vibration and Shock, 2024, 43(1): 71-82

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