A calculation method and application of bond-slip effect of reinforced concrete

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (24) : 159-166.

RUAN Sheng1,2,ZHENG Shansuo1,2,ZHANG Yixin3,DONG Liguo1,2,WANG Zhuohan4

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Abstract

The bond-slip effect in the anchored region of reinforced concrete (RC) structure is taken as the research object. Based on the uniform bond-slip constitutive model and the micro-element method, the governing equation of the anchored area is established, and the analytical model of stress-slip relationship of reinforcement is obtained by integral calculation and considering the boundary conditions in practical engineering. The reliability of the proposed model is verified by comparison with the existing pull-out test data. Furthermore, based on the OpenSEES finite element platform, the model in this paper is nested with a zero-length fiber cross-section element, and a fiber beam-column element is combined to establish a fiber numerical modeling method that considers the bond-slip effect of steel bar. By comparing with the quasi-static test of existing RC members and the numerical model of nested traditional macro-constitutive model, the reliability of the analytical model in this paper is further verified at the component level. The results show that the stress-slip model proposed in this paper can accurately reflect the slip behavior of long anchored reinforcement under tension. The zero-length fiber model using the proposed bar stress-slip model can accurately calculate the hysteresis curve of RC columns. Compared with the numerical model of nested traditional macro-constitutive model, the prediction accuracy of RC column stiffness, strength and the degradation law of them can be improved. Moreover, for RC members with different design parameters, the sliding behavior of reinforcement under different loading conditions can be characterized more accurately.
Key words: reinforced concrete; bond-slip; stress-slip; zero-length element; OpenSEES

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reinforced concrete / bond-slip / stress-slip / zero-length element / OpenSEES

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RUAN Sheng1,2,ZHENG Shansuo1,2,ZHANG Yixin3,DONG Liguo1,2,WANG Zhuohan4. A calculation method and application of bond-slip effect of reinforced concrete[J]. Journal of Vibration and Shock, 2022, 41(24): 159-166

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