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Structural Engineering and Mechanics
  Volume 38, Number 6, June25 2011 , pages 803-823
DOI: https://doi.org/10.12989/sem.2011.38.6.803
 


Parallel computation for debonding process of externally FRP plated concrete
Tao Xu, Yongbin Zhang, Z.Z. Liang, Chun-an Tang and Jian Zhao

 
Abstract
    In this paper, the three dimensional Parallel Realistic Failure Process Analysis (RFPA3D-Parallel) code based on micromechanical model is employed to investigate the bonding behavior in FRP sheet bonded to concrete in single shear test. In the model, the heterogeneity of brittle disordered material at a meso-scale was taken into consideration in order to realistically demonstrate the mechanical characteristics of FRP-to-concrete. Modified Mohr-coulomb strength criterion with tension cut-off, where a stressed element can damage in shear or in tension, was adopted and a stiffness degradation approach was used to simulate the initiation, propagation and growth of microcracks in the model. In addition, a Master-Slave parallel operation control technique was adopted to implement the parallel computation of a large numerical model. Parallel computational results of debonding of FRP-concrete visually reproduce the spatial and temporal debonding failure progression of microcracks in FRP sheet bonded to concrete, which agrees well with the existing testing results in laboratory. The numerical approach in this study provides a useful tool for enhancing our understanding of cracking and debonding failure process and mechanism of FRP-concrete and our ability to predict mechanical performance and reliability of these FRP sheet bonded to concrete structures.
 
Key Words
    FRP sheet; concrete; debonding; damage; failure process; parallel computation
 
Address
Tao Xu: Center for Material Failure Modeling Research, Dalian University, Dalian 116622, China; State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection, Chengdu University of Technology, Chengdu 610059, China
Yongbin Zhang: School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
Z.Z. Liang: School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
Chun-an Tang: School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
Jian Zhao: Ecole Polytechnique Federale de Lausanne, Rock Mechanics Laboratory, CH-1015 Lausanne, Switzerland
 

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