Seismic Performance and Global Ductility of Reinforced Concrete Frames with CFRP Laminates Retrofitted Joints

Post-earthquake reconnaissance and experimental research indicate that the beam-column joint is a crucial zone in reinforced concrete (RC) moment resisting frames. Due to their exceptional mechanical properties and high strength to weight ratio, fiber reinforced polymers (FRP) are considered to be one of the most promising materials for beam-column joint retrofitting in RC structures. In this study, the efficacy of joint retrofitting in upgrading the seismic performance of RC structures is numerically investigated through displacement-based adaptive pushover and inelastic dynamic time history analyses. Four typical FRP strengthening schemes between the beam and column are investigated and the corresponding structural global ductility and seismic performance for FRP joint-retrofitted RC frames are evaluated through both the seismic behavior factor and the inter-story drift ratio. The proposed method is demonstrated by seismic behavior of an intermediate-rise RC building under earthquake forces. The numerical results indicate that the proposed retrofitting scheme can greatly improve the seismic performance and global ductility of RC buildings.

[1]  Reza Akbari,et al.  SEISMIC BEHAVIOUR FACTOR, R, FOR STEEL X-BRACED AND KNEE-BRACED RC BUILDINGS , 2003 .

[2]  Bassam A. Izzuddin,et al.  Conceptual issues in geometrically nonlinear analysis of 3D framed structures , 2001 .

[3]  C. Pantelides,et al.  Shear Strengthening of RCT-Joints Using CFRP Composites , 2000 .

[4]  Stephanie L. Walkup,et al.  Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures (ACI 440.2R-02) , 2005 .

[5]  G. Monti,et al.  Tests and design equations for FRP-strengthening in shear , 2007 .

[6]  Azadeh Parvin,et al.  Investigation on the effects of fiber composites at concrete joints , 2000 .

[7]  Rui Pinho,et al.  ADVANTAGES AND LIMITATIONS OF ADAPTIVE AND NON-ADAPTIVE FORCE-BASED PUSHOVER PROCEDURES , 2004 .

[8]  Costas P. Antonopoulos,et al.  EXPERIMENTAL INVESTIGATION OF FRP-STRENGTHENED RC BEAM-COLUMN JOINTS , 2003 .

[9]  N. W. Hanson,et al.  RECOMMENDATIONS FOR DESIGN OF BEAM-COLUMN JOINTS IN MONOLITHIC REINFORCED CONCRETE STRUCTURES. , 1985 .

[10]  E. P. Warnke,et al.  CONSTITUTIVE MODEL FOR THE TRIAXIAL BEHAVIOR OF CONCRETE , 1975 .

[11]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

[12]  Gian Michele Calvi,et al.  Adaptive pushover-based methods for seismic assessment and design of bridge structures , 2005 .

[13]  Ahmed Ghobarah,et al.  SEISMIC REHABILITATION OF BEAM-COLUMN JOINTS USING FRP LAMINATES , 2001 .

[14]  Panagiotis J. Madas,et al.  Advanced modelling of composite frames subject to earthquake loading , 1993 .

[15]  Matthew B. Blaschko,et al.  Externally bonded FRP reinforcement for RC structures , 2001 .

[16]  K. Zilch,et al.  Beiträge im fib-Bulletin 14: Externally bonded FRP Reinforcement for RC Structures , 2001 .

[17]  A. Parvin and P. Granata.  Numerical Study Of Structural Joints ReinforcedWith Composite Fabrics , 1998 .

[18]  S. Sheikh,et al.  Seismic Resistance of Square Concrete Columns Retrofitted with Glass Fiber-Reinforced Polymer , 2005 .

[19]  Rui Pinho,et al.  Verification of displacement-based adaptive pushover through multi-ground motion incremental dynamic analyses , 2009 .

[20]  Rui Pinho,et al.  Assessment of Continuous Span Bridges through Nonlinear Static Procedures , 2009 .

[21]  Amr S. Elnashai,et al.  Overstrength and force reduction factors of multistorey reinforced‐concrete buildings , 2002 .

[22]  S. L. Dimova,et al.  Seismic assessment of an industrial frame structure designed according to Eurocodes. Part 2: Capacity and vulnerability , 2005 .

[23]  Robert Park,et al.  Evaluation of ductility of structures and structural assemblages from laboratory testing , 1989 .