Test technique and data processing method for dynamic bond behavior between steel bar and concrete under high stress rates

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 43-48.

ZHOU Jikai SHEN Dawei PAN Yan

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Abstract

Based on Split Hopkinson Pressure Bar (SHPB) device, together with a reaction frame, a force bearing device and fixed supports, a loading device for testing the dynamic bond behavior between steel bar and concrete, especially under high stress rates, was developed. The dynamic pull-out tests were carried out on 15 specimens of three concrete strengths (C30, C40 and C50) under the impact air pressure of 1.0 MPa. The experimental results show that the ultimate bond strength increases and the corresponding slip decreases with the increase of bond stress rates; the ultimate bond strength increases with the increase of concrete strength but the corresponding slip has no obvious change. After conducting the tests, the suitable methods for test specimen installation, loading application and data acquisition and processing were concluded. The normative test procedure and dynamic bond stress-slip curves for the whole loading process were obtained.

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SHPB device / high stress rate / bond behavior / dynamic test technique

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ZHOU Jikai SHEN Dawei PAN Yan. Test technique and data processing method for dynamic bond behavior between steel bar and concrete under high stress rates[J]. Journal of Vibration and Shock, 2017, 36(18): 43-48

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