Mechanical behaviour of pitting corrosion of flexural and shear reinforcement and its effect on structural reliability of corroding RC beams

A spatial time-dependent reliability model is developed for a RC beam subject to corrosion-induced pitting corrosion, for shear and flexural limit states. The analysis considers the spatial and time-dependent variability of pitting corrosion, structural resistance and load effects. The amount of corrosion loss can significantly affect the mechanical behaviour of reinforcement, namely low corrosion loss can result in ductile yielding, whereas a higher corrosion loss can result in brittle fracture. The progression from ductile to brittle behaviour is spatially and time-dependent. To estimate how such phenomena affects structural reliability the structural resistance of reinforcement is modelled as either (i) perfectly ductile parallel system or (ii) perfectly brittle parallel system. It was found that the probability of failure assuming brittle reinforcement behaviour is up to 450% higher than assuming ductile behaviour.

[1]  Ravindra K. Dhir,et al.  PFA concrete: chloride-induced reinforcement corrosion , 1994 .

[2]  Robert E. Melchers,et al.  RELIABILITY OF DETERIORATING RC SLAB BRIDGES , 1997 .

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

[4]  Göran Fagerlund,et al.  Frost damage on concrete : estimation of the future deterioration - a contribution to the BRITE/EURAM project BREU-CT92-0591 "The Residual Service Life of Concrete Structures" , 1995 .

[5]  David V. Rosowsky,et al.  Serviceability Design in LRFD for Wood , 1993 .

[6]  Palle Thoft-Christensen,et al.  Structural Reliability Theory and Its Applications , 1982 .

[7]  K. Tuutti.  Corrosion of steel in concrete , 1982 .

[8]  D. E. Hawn.  Extreme value prediction of maximum pits on pipelines , 1977 .

[9]  D. Michalopoulos,et al.  The impact of corrosion on the mechanical behavior of steel undergoing plastic deformation , 2007 .

[10]  S. Pantazopoulou,et al.  Recovery of seismic resistance in corrosion-damaged reinforced concrete through FRP jacketing , 2005 .

[11]  Andrew Chan,et al.  Residual capacity of corroded reinforcing bars , 2005 .

[12]  Y. Li,et al.  Spatial variability of concrete deterioration and repair strategies , 2004 .

[13]  Cruz Alonso,et al.  Comparison of rates of general corrosion and maximum pitting penetration on concrete embedded steel reinforcement , 1995 .

[14]  Bruce R. Ellingwood,et al.  Analysis of Live Loads in Office Buildings , 1977 .

[15]  N. Null.  Minimum Design Loads for Buildings and Other Structures , 2003 .

[16]  Dan M. Frangopol,et al.  Bridge Lifetime System Reliability Under Multiple Limit States , 2001 .

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

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

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

[20]  Bruce R. Ellingwood,et al.  Reliability-Based Service-Life Assessment of Aging Concrete Structures , 1993 .

[21]  M. S. Darmawan,et al.  Spatial time-dependent reliability analysis of corroding pretensioned prestressed concrete bridge girders , 2007 .

[22]  N. Otsuki,et al.  Influences of Bending Crack and Water-Cement Ratio on Chloride-Induced Corrosion of Main Reinforcing Bars and Stirrups , 2000 .

[23]  Robert E. Melchers,et al.  Life‐Cycle Performance of RC Bridges: Probabilistic Approach , 2000 .

[24]  Campbell R. Middleton,et al.  A proposed empirical corrosion model for reinforced concrete , 2000 .

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

[26]  D. A. Hansen,et al.  Statistical Modeling of Pitting Corrosion and Pipeline Reliability , 1990 .

[27]  M. Saeed Mirza,et al.  Mechanical Response of Corroded Steel Reinforcement of Abandoned Concrete Bridge , 2002 .

[28]  Mark G. Stewart,et al.  Spatial time-dependent reliability analysis of corrosion damage and the timing of first repair for RC structures , 2007 .

[29]  Mark G. Stewart,et al.  Structural reliability of concrete bridges including improved chloride-induced corrosion models , 2000 .

[30]  Mark G. Stewart,et al.  Spatial variability of pitting corrosion and its influence on structural fragility and reliability of RC beams in flexure , 2004 .

[31]  Bruce Ellingwood,et al.  Development of a probability based load criterion for American National Standard A58 , 1980 .

[32]  Michael P. Enright,et al.  Condition Prediction of Deteriorating Concrete Bridges Using Bayesian Updating , 1999 .

[33]  Mark G. Stewart,et al.  Predicting the Likelihood and Extent of Reinforced Concrete Corrosion-Induced Cracking , 2005 .

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

[35]  Dimitri V. Val,et al.  Deterioration of strength of RC beams due to corrosion and its influence on beam reliability , 2007 .

[36]  Mark G. Stewart,et al.  Pitting corrosion and structural reliability of corroding RC structures: Experimental data and probabilistic analysis , 2008, Reliab. Eng. Syst. Saf..