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Relative slip relation of shear stress at concrete interface

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Document pages: 9 pages

Abstract: In this study, a simple and reasonable shear stress relative slip model of concrete interface with integral casting or smooth construction joint is developed. When the model was developed, the relative slip under initial shear cracking stress and peak stress was obtained by nonlinear regression analysis, which used the test data of push off specimens. According to the upper bound theorem of concrete plasticity, the shear friction strength is determined from the generalized equation. Then, the parameter fitting analysis is carried out to derive the key parameter equations to determine the rising and falling branch shapes of the shear stress relative slip curve. The comparison of the predicted and measured results obtained from the push off test confirms that the proposed model provides superior accuracy in predicting the shear stress-relative slip relationship of interfacial shear planes. This was evidenced by the lower normalized root mean square error than those in Xu et al.’s model and the CEB-FIB model, which have many limitations in terms of the roughness of the substrate surface along an interface and the magnitude of equivalent normal stress.

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