Effect of bond and corrosion within partial length on shear behaviour and load capacity of RC beam

This paper describes an experimental investigation into the effect of corrosion damaged partial length in one shear span on the shear behaviour and load capacity of reinforced concrete (RC) beams, where 14 RC beams were tested in four-point bending. Two shear span-to-effective depth ratios 2.0 and 3.0, two different partial lengths and three bond characteristics within the designed partial length were considered. Test results of the RC specimens were compared with theoretical results of the corresponding noncorroded bond-perfect RC beams, and the differences were analyzed to deduce the influence of the bond and corrosion within partial length on behaviour and load capacity of RC beams. The results indicate that the mechanical behaviour and load capacity of the test specimens are greatly influenced by the bond characteristics and high corrosion-induced damage within the partial length. Artificial elimination of the bond and neglecting of the corrosion-induced damage in the longitudinal bars and the connected stirrups within the partial length may lead to overestimate the residual capacity of the corrosion damaged RC beam. In assessing the residual life span and reliability of the in-service RC structures, it is very important to consider the severe corrosion damage within certain length of the RC elements.

[1]  G. Arliguie,et al.  Mechanical behaviour of corroded reinforced concrete beams—Part 1: Experimental study of corroded beams , 2000 .

[2]  Mark Alexander,et al.  Behaviour of RC beams corroded under sustained service loads , 2009 .

[3]  Xiao-Hui Wang,et al.  Performance of RC columns with partial length corrosion , 2008 .

[4]  Hong-Gun Park,et al.  Unified shear strength model for reinforced concrete beams-Part II: Verification and simplified method , 2007 .

[5]  Koichi Maekawa,et al.  Interaction of Pre-Induced Damages along Main Reinforcement and Diagonal Shear in RC Members , 2004 .

[6]  Arnaud Castel,et al.  Corrosion process and structural performance of a 17 year old reinforced concrete beam stored in chloride environment , 2007 .

[7]  Xiao-Hui Wang,et al.  Predicting the flexural capacity of RC beam with partially unbonded steel reinforcement , 2009 .

[8]  Abul K. Azad,et al.  Residual strength of corrosion-damaged reinforced concrete beams , 2007 .

[9]  Yingang Du,et al.  Impact of Reinforcement Corrosion on Ductile Behavior of Reinforced Concrete Beams , 2007 .

[10]  William C Farrow,et al.  Tests of Reinforced Concrete Beams with Corrosion-Damaged Stirrups , 2006 .

[11]  J Cairns,et al.  STRENGTH IN SHEAR OF CONCRETE BEAMS WITH EXPOSED REINFORCEMENT. , 1995 .

[12]  Rasheeduzzafar,et al.  EFFECT OF REINFORCEMENT CORROSION ON FLEXURAL BEHAVIOR OF CONCRETE SLABS , 1996 .

[13]  Young Soo Yoon,et al.  Minimum Shear Reinforcement in Normal, Medium,and High-Strength Concrete Beams , 1996 .

[14]  K. Maekawa,et al.  2065 SHEAR CAPACITY OF DAMAGED RC BEAM WITH PARTIAL LONGITUDINAL CRACKS IN SPACE , 2004 .

[15]  Sven Thelandersson,et al.  Behavior of reinforced concrete beams with loss of bond at longitudinal reinforcement , 2003 .

[16]  J. Rodriguez,et al.  LOAD CARRYING CAPACITY OF CONCRETE STRUCTURES WITH CORRODED REINFORCEMENT , 1997 .

[17]  H. Najm,et al.  Flexural behavior of concrete slabs with corroded bars , 2008 .

[18]  Tim Topper,et al.  Long-Term Performance of Corrosion-Damaged Reinforced Concrete Beams , 2005 .

[19]  Andrés A. Torres-Acosta,et al.  Influence of Corrosion on the Structural Stiffness of Reinforced Concrete Beams , 2004 .

[20]  Richard N. White,et al.  Shear-Critical Cracking in Slender Reinforced Concrete Beams , 1999 .

[21]  M. Raoof,et al.  PREDICTION OF THE BEHAVIOUR OF RC BEAMS WITH EXPOSED REINFORCEMENT , 1995 .

[22]  M. Raoof,et al.  STRUCTURAL CHARACTERISTICS OF RC BEAMS WITH EXPOSED MAIN STEEL. , 1997 .

[23]  Andrés A. Torres-Acosta,et al.  Residual flexure capacity of corroded reinforced concrete beams , 2007 .

[24]  Rasheeduzzafar,et al.  EFFECT OF REINFORCEMENT CORROSION ON BOND STRENGTH , 1996 .

[25]  M. S. Elgarf,et al.  Flexural Strength of Concrete Beams with Corroding Reinforcement , 1999 .

[26]  J. Cairns,et al.  BEHAVIOUR OF CONCRETE BEAMS WITH EXPOSED REINFORCEMENT , 1993 .

[27]  Xi-la Liu,et al.  Simplified Methodology for the Evaluation of the Residual Strength of Corroded Reinforced Concrete Beams , 2010 .

[28]  Tim Topper,et al.  Analytical Model to Predict Nonlinear Flexural Behavior of Corroded Reinforced Concrete Beams , 2005 .