Finite element analysis of the flexural fatigue performance of reinforced concrete beams reinforced with externally bonded prestressed CFRP sheets

doi:10.19936/j.cnki.2096-8000.20230228.006

Abstract

Abstract: To investigate the flexural performance of reinforced concrete beams reinforced with externally bonded prestressed CFRP sheets under fatigue loading, in this paper, the fatigue damage of concrete, steel bar and CFRP during fatigue loading is taken into account comprehensively and the fatigue constitutive model of each material is established. Fatigue cumulative damage failure full process numerical analysis method is adopted and the ABAQUS software is used to model and analyze the reinforced concrete beam reinforced with prestressed CFRP sheet. The influence of concrete strength, fatigue load amplitude and CFRP prestress level on the flexural performance of the reinforced beam under fatigue load is studied respectively. The results of the analysis show that increasing the strength of concrete, increasing the prestressing level of the CFRP and reducing the load amplitude can increase the residual bearing capacity of reinforced beams after fatigue loading and reduce the strain of concrete, steel bar and CFRP to improve the force and deformation performance of the reinforced beam. Increasing the level of CFRP prestressing can effectively increase the strength utilisation of CFRP and give full play to its high strength properties.

Key words: externally bonded, prestressed CFRP, fatigue constitutive, reinforced concrete beam, finite element analysis

CLC Number:

TB332

ZHANG Zhimei, YANG Yang. Finite element analysis of the flexural fatigue performance of reinforced concrete beams reinforced with externally bonded prestressed CFRP sheets[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(2): 44-53.

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