Finite element analysis of width effect in interface debonding of FRP plate bonded to concrete

Abstract A three-dimensional meso-mechanical model to study the debonding of FRP-to-concrete is described and then verified in this paper. The influence of the width of the FRP on the load-carrying capacity is investigated to understand the debonding mechanism of failure in such systems. Numerical simulations show that the progressive debonding of FRP plate bonded to concrete occurring beneath the FRP plate can be divided into four stages: elastic-deformation stage, the elastic-softening stage, the elastic-softening-debonded stage and softening-debonded stage. The numerical simulations indicate the development of high stress/strain gradients at the interface as a consequence of the relative slip between the FRP and the concrete. With the increase of the width of FRP plate, the interfacial bond strength and the slope of the initial elastic deformation of the load-global slip of FRP-to-concrete increases, the global slip is lower when increasing FRP width at the same stress level, by contrast, the total ultimate interfacial slip decreases with the increase of FRP plate width, and the interfacial ductility of FRP-to-concrete and the utilization efficiency of FRP plate also reduce. The reinforcement efficiency of the bonding of FRP plate in strips is higher than that of the bonding of FRP plate as a whole. In addition, the bending stress is of significant influence on the maximum principal stress at the loading end and near the plate edge and the debonding of FRP-to-concrete starts in the concrete beneath FRP plate near the edge of FRP plates and loading end. Numerical results on debonding of FRP-concrete visually reproduce the temporal evolution and spatial distribution of microcracking in FRP-to-concrete and reveal the distribution patterns of stress and strain in FRP plate and concrete, which is in good agreement with the existing experimental results in laboratory. Numerical simulations show that the numerical approach in the present study provides a useful tool for enhancing our understanding of debonding failure process and mechanism of FRP-concrete and our ability to predict mechanical performance and reliability of these FRP plate bonded to concrete structures.

[1]  K. W. Neale,et al.  EXPERIMENTAL INVESTIGATION OF BONDED FIBER REINFORCED POLYMER-CONCRETE JOINTS UNDER CYCLIC LOADING , 2003 .

[2]  L G Tham,et al.  Fracture spacing in layered materials and pattern transition from parallel to polygonal fractures. , 2006, Physical review. E, Statistical, nonlinear, and soft matter physics.

[3]  Zhishen Wu,et al.  Theoretical solutions on interfacial stress transfer of externally bonded steel/composite laminates. , 2001 .

[4]  Somnath Ghosh,et al.  Interfacial debonding analysis in multiple fiber reinforced composites , 2000 .

[5]  Kasumassa Nakaba,et al.  BOND BEHAVIOR BETWEEN FIBER-REINFORCED POLYMER LAMINATES AND CONCRETE , 2001 .

[6]  Leslie George Tham,et al.  Numerical studies of the influence of microstructure on rock failure in uniaxial compression — Part I: effect of heterogeneity , 2000 .

[7]  Michael J. Chajes,et al.  Bond and Force Transfer of Composite-Material Plates Bonded to Concrete , 1996 .

[8]  Chris J. Pearce,et al.  Computational aspects of the discontinuous deformation analysis framework for modelling concrete fracture , 1998 .

[9]  Chun’an Tang,et al.  Modeling of Transverse Thermal Cracking of FRP Bars Embedded in Concrete , 2014 .

[10]  Giuseppe Lacidogna,et al.  Acoustic emission monitoring and numerical modeling of FRP delamination in RC beams with non-rectangular cross-section , 2007 .

[11]  Michel Ghosn,et al.  Experimental Investigation and Fracture Analysis of Debonding between Concrete and FRP Sheets , 2006 .

[12]  Gary David Holt,et al.  FRP or steel plate-to-concrete bonded joints: Effect of test methods on experimental bond strength , 2001 .

[13]  Christian U. Grosse,et al.  Quantitative evaluation of fracture processes in concrete using signal-based acoustic emission techniques , 2006 .

[14]  L. Mishnaevsky,et al.  Numerical simulation of progressive debonding in fiber reinforced composite under transverse loading , 2011 .

[15]  H. Saadatmanesh,et al.  RC Beams Strengthened with GFRP Plates. I: Experimental Study , 1991 .

[16]  Jian fei Chen,et al.  Experimental study on FRP-to-concrete bonded joints , 2005 .

[17]  X. Tao,et al.  Fracture spacing in layered materials: A new explanation based on two-dimensional failure process modeling , 2008, American Journal of Science.

[18]  Marie-José Nollet,et al.  Strengthening of reinforced concrete beams with externally bonded fiber-reinforced-plastic plates: design guidelines for shear and flexure , 1998 .

[19]  Jian fei Chen,et al.  Anchorage strength models for FRP and steel plates bonded to concrete , 2001 .

[20]  D. Van Gemert,et al.  Force transfer in epoxy bonded steel/concrete joints , 1980 .

[21]  A. Nanni,et al.  Contribution of Externally Bonded FRP to Shear Capacity of RC Flexural Members , 1998 .

[22]  Jian Zhao,et al.  Parallel computation for debonding process of externally FRP plated concrete , 2011 .

[23]  L. G. Tham,et al.  A numerical study of the influence of heterogeneity on the strength characterization of rock under uniaxial tension , 2007 .

[24]  D. Lockner.  The role of acoustic emission in the study of rock fracture , 1993 .

[25]  M. Savoia,et al.  Analysis of FRP–concrete debonding via boundary integral equations , 2008 .

[26]  Scott T. Smith,et al.  FRP: Strengthened RC Structures , 2001 .

[27]  Maria Antonietta Aiello,et al.  Interface analysis between FRP EBR system and concrete , 2008 .

[28]  W. Weibull.  A Statistical Distribution Function of Wide Applicability , 1951 .

[29]  C. Tang,et al.  Numerical simulation of progressive rock failure and associated seismicity , 1997 .

[30]  Jian Fei Chen,et al.  Three dimensional stress distribution in FRP-to-concrete bond test specimens , 2006 .

[31]  Zhengzhao Liang,et al.  Three Dimensional Numerical Approach to Splitting Failure of Rock Discs , 2007 .

[32]  Zhishen Wu,et al.  Full-range behavior of FRP-to-concrete bonded joints , 2004 .

[33]  K. Neale,et al.  Transfer Lengths and Bond Strengths for Composites Bonded to Concrete , 1999 .

[34]  Jie Li,et al.  EXPERIMENTAL STUDY ON BOND BEHAVIOR BETWEEN FRP AND CONCRETE , 2004 .

[35]  F. Vecchio,et al.  TOWARDS MODELING OF REINFORCED CONCRETE MEMBERS WITH EXTERNALLY BONDED FIBER-REINFORCED POLYMER COMPOSITES , 2003 .

[36]  Riadh Al-Mahaidi,et al.  Modelling of CFRP-concrete shear-lap tests , 2007 .

[37]  Zhishen Wu,et al.  Numerical Analysis of Debonding Mechanisms in FRP‐Strengthened RC Beams , 2005 .

[38]  D. Lockner,et al.  Quasi-static fault growth and shear fracture energy in granite , 1991, Nature.

[39]  J. Teng,et al.  Finite element simulation of debonding in FRP-to-concrete bonded joints , 2006 .

[40]  Peter K. Kaiser,et al.  Numerical simulation of cumulative damage and seismic energy release during brittle rock failure-Part I: Fundamentals , 1998 .

[41]  C. A. Tang,et al.  MESOMECHANICAL MODEL FOR CONCRETE. PART I: MODEL DEVELOPMENT , 2004 .

[42]  Jin-Guang Teng,et al.  Bond-slip models for FRP sheets/plates bonded to concrete , 2005 .

[43]  Jin-Guang Teng,et al.  Meso-scale finite element model for FRP sheets/plates bonded to concrete , 2005 .

[44]  M. J. Forrestal,et al.  Penetration of Targets Described by a Mohr-Coulomb Failure Criterion With a Tension Cutoff , 1983 .