Corrosion-induced cover spalling and anchorage capacity

The aim of this study is to enhance our understanding of anchorage capacity in reinforced concrete structures with corrosion-induced cover spalling. Our objectives were to study the influence of corrosion-induced cover spalling on bond strength, and to validate an existing one-dimensional (1D) analysis for anchorage capacity in such cases. Thus, earlier developed bond and corrosion models suited for detailed three-dimensional (3D) finite element (FE) analysis were first combined with a new computation scheme to simulate corrosion-induced cover spalling. The 1D and 3D FE analyses were validated through two types of experiments, i.e. eccentric pull-out tests and beam tests, as well as a comparison with an existing empirical model. The application of 3D FE analysis showed that the corrosion of stirrups advances the emergence of cracking and spalling, while bond strength is only slightly influenced by the corrosion of stirrups after cover spalling if yielding of stirrups has not taken place. Moreover, it was shown that stresses in the stirrups due to corrosion in adjacent bars rapidly diminished within a short distance from the main bar, and that the corrosion of stirrups influenced the shear capacity more prominently than the induced stresses in stirrups due to the corrosion of main bars.

[1]  Irina Vasiljeva Sæther,et al.  Bond deterioration of corroded steel bars in concrete , 2011 .

[2]  Kamyab Zandi Hanjari,et al.  Evaluation of WST Method as a Fatigue Test for Plain and Fiber-reinforced Concrete - experimental and numerical investigation , 2006 .

[3]  Yingang Du,et al.  Effect of corrosion on ductility of reinforcing bars , 2005 .

[4]  Paul E. Regan,et al.  ASSESSMENT OF CONCRETE STRUCTURES AFFECTED BY COVER DELAMINATION. PART 1: EFFECT OF BOND LOSS , 2009 .

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

[6]  Karin Lundgren,et al.  Bond capacity of severely corroded bars with corroded stirrups , 2011 .

[7]  Karin Lundgren,et al.  Severely Corroded RC with Cover Cracking , 2013 .

[8]  G. J. Al-Sulaimani,et al.  Influence of Corrosion and Cracking on Bond Behavior and Strength of Reinforced Concrete Members , 1990 .

[9]  N. Silva.  Chloride Induced Corrosion of Reinforcement Steel in Concrete - Threshold Values and Ion Distributions at the Concrete-Steel Interface , 2013 .

[10]  Kent Gylltoft,et al.  A MODEL FOR THE BOND BETWEEN CONCRETE AND REINFORCEMENT , 2000 .

[11]  Severely Corroded Reinforced Concrete with Cover Cracking: Part 1. Crack Initiation and Propagation , 2011 .

[12]  Per Kettil,et al.  Analytical model for the bond-slip behaviour of corroded ribbed reinforcement , 2012 .

[13]  E. Thorenfeldt.  Mechanical properties of high-strength concrete and applications in design , 1987 .

[14]  Karin Lundgren,et al.  Bond between ribbed bars and concrete. Part 1: Modified model , 2005 .

[15]  Giovanni Plizzari,et al.  Mechanical Properties of Corrosion-Damaged Reinforcement , 2005 .

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

[17]  Dario Coronelli,et al.  Structural Assessment of Corroded Reinforced Concrete Beams: Modeling Guidelines , 2004 .

[18]  Karin Lundgren,et al.  Effect of corrosion on the bond between steel and concrete: an overview , 2007 .

[19]  Cruz Alonso,et al.  Cover cracking as a function of bar corrosion: Part I-Experimental test , 1993 .

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

[21]  Dario Coronelli,et al.  Three-dimensional modelling of structural effects of corroding steel reinforcement in concrete , 2013 .

[22]  Per Kettil,et al.  Analysis of Mechanical Behavior of Corroded Reinforced Concrete Structures , 2011 .

[23]  Rasheeduzzafar,et al.  CORROSION CRACKING IN RELATION TO BAR DIAMETER, COVER, AND CONCRETE QUALITY , 1992 .

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

[25]  J. Rots.  Computational modeling of concrete fracture , 1988 .

[26]  Paul E. Regan,et al.  Shear strength of RC beams with defective stirrup anchorages , 2004 .

[27]  A. Almusallam,et al.  Effect of degree of corrosion on the properties of reinforcing steel bars , 2001 .

[28]  Yingang Du,et al.  Finite element analysis of cracking and delamination of concrete beam due to steel corrosion , 2013 .

[29]  D. Hordijk.  Local approach to fatigue of concrete , 1991 .

[30]  A C Smith,et al.  Corrosion of steel in concrete , 1982 .

[31]  Cruz Alonso,et al.  Cover cracking as a function of rebar corrosion: Part 2—Numerical model , 1993 .

[32]  Christian Cremona,et al.  Guideline for Load and Resistance Assessment of Existing European Railway Bridges: Advices on the use of advanced methods , 2007 .

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

[34]  Kamyab Zandi Hanjari,et al.  Structural behaviour of deteriorated concrete structures , 2010 .