Reinforced concrete separation model based on dynamic bond-slip performances

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (2) : 1-8.

LIU Zhi1，ZHAO Lanhao2，WU Xiaobin1，ZHOU Yongmen1，WANG Jiao1

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Abstract

Based on the bond-slip mechanism of reinforced concrete, a dynamic bond-slip constitutive relation capable of describing the change of the bond behavior of steel bars and concrete under cyclic load was established, and a single-spring joint element method was used to establish a separation model of reinforced concrete.The model overcomes the difficulty to choose the normal stiffness coefficients, and solves the problem of the arrangement of steel bars by means of solving the steel bar elements in local coordinate system, which ensures the calculation accuracy and efficiency under complex stress conditions.In addition, a classic example analysis was performed by combined use of the concrete damage model.The model was used to simulate the relationship between the local deformation and forces of the steel bar and concrete in the structure.Furthermore, the effects of surface reinforcement of the Koyna gravity dam on the overall dynamic response and ultimate failure mode of the dam under the action of seismic load were compared and analyzed.The result shows that when seismic reinforcement is arranged in the vulnerable area of the surface of the dam, it can play a certain role in limiting cracking and improve the seismic performance of the dam.The simulation results of the examples can reflect the general cognition of the engineering community, and also verify the validity of the model.

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reinforced concrete / bond-slip / single-spring joint element / separation model / dynamic analysis

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LIU Zhi1，ZHAO Lanhao2，WU Xiaobin1，ZHOU Yongmen1，WANG Jiao1. Reinforced concrete separation model based on dynamic bond-slip performances[J]. Journal of Vibration and Shock, 2021, 40(2): 1-8

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