Coupled reliability model of biodeterioration, chloride ingress and cracking for reinforced concrete structures |
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Authors: | Emilio Bastidas-Arteaga Mauricio Snchez-Silva Alaa Chateauneuf Moema Ribas Silva |
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Affiliation: | aDepartment of Civil and Environmental Engineering. Universidad de los Andes, Carrera 1 N. 18A-70 EdificioW, Piso 3. Bogotá, Colombia;bLGC/CUST-UBP, Clermond-Ferrand, BP 206 63174 Aubière Cedex, France;cUniversidade Federal do Espı´rito Santo, Vitoria, Brazil |
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Abstract: | Maintaining and operating civil infrastructure systems has been recognized as a critical issue worldwide. Among all possible causes of safety reduction during the structural lifetime, deterioration is particularly important. Structural deterioration is usually a slow time-dependent process controlled by safety and operation threshold specifications. This paper presents a model of RC deterioration by coupling biodeterioration (i.e., chemical, physical and mechanical action of live organisms), steel corrosion, and concrete cracking. The final purpose of the model is to compute the reduction of the concrete section and the area of steel reinforcement in order to assess the change of structural capacity with time. Given the uncertainties in both the parameters and the model, the probabilistic nature of loads, the material properties and the diffusion process are taken into account to evaluate structural reliability. The model is illustrated with an example where the inelastic behavior of a pile subject to random loading is considered. The results of the analysis have shown that the effect of biodeterioration on the structural performance is significant and can cause an important reduction of its lifetime. On the whole, the paper states that modeling the effects of biodeterioration in RC structures should be included as part of infrastructure planning and design, especially, when they are located in aggressive environments. |
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Keywords: | Biodeterioration Chloride ingress Corrosion Crack initiation Crack propagation Reliability |
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