FLEXURAL RELIABILITY ASSESSMENT OF REINFORCED CONCRETE BRIDGE DECK WITH CARBON FIBRE REINFORCED POLYMER (CFRP) EXPOSED TO CORROSION
Publication Date : 01/02/2019
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Abstract :
The strength of reinforced concrete elements retrofitted in flexure by means of externally bonded Carbon Fibre Reinforced Polymers (CFRP) has attracted the attention of researchers due to many advantages highlighted by a wide set of experimental results. This research presents reliability study on reinforced concrete (RC) bridge deck strengthened with externally bonded CFRP subject to corrosion. The deck was subjected to reliability analysis, using First Order Reliability Method (FORM), enhanced with genetic algorithms and the inherent safety was found to yield safety index of 3.8, this agreed with the recommendation of the Joint Committee of Structural Safety Code (JCSS 2001) for structures with moderate consequence of failure. The reliability analysis for the intact and the corrosion affected deck were executed through a developed program, written using MATLAB Simulink and the result showed the detrimental effect of corrosion on reinforcement of steel in the bridge deck. Flexural capacity restoration was also undertaken for the bridge deck using Carbon Fibre Reinforced Polymer (CFRP) with the adoption of adhesive bonding technique. The results of the reliability-based analysis of the strengthened deck with Carbon Fibre Reinforced Polymer (CFRP) yielded a flexural capacity restoration up to 100%. Sensitivity analysis for the bending mode of failure were also conducted and it was observed that the critical mode of failure to be strengthened is flexure.
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