Probabilistic Deterioration Prediction of Prestressed Concrete Bridge Girder in a Chloride Environment
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Abstract
In recent years, aging of infrastructure has become a serious concern in Thailand. The performance of structure shows signs of deterioration that need for maintenance in order to ensure safety and serviceability of structure. Especially, prestressed concrete bridge girder that have widely used in Thailand and its need specific techniques for repairing. Bridge Management Systems (BMSs) have been developed to manage the maintenance of the bridges under required performance of structure and limitation of budget. Consequently, the purpose of this paper was to study deterioration prediction of prestressed concrete bridge girder that is one part of Bridge Management Systems (BMSs). Deterioration prediction model of performance of prestressed concrete is conducted in time dependent analysis. Due to corrosion of reinforcing steel by chloride attack is more severe than others, this study intends to introduce BMSs for chloride attack firstly. Criteria can be classified into three limit states, durability, serviceability and ultimate limit states. A reliability of structure was computed based on Monte Carlo simulation. The results demonstrate effect of parameters such as surface chloride content, chloride diffusion, corrosion rate and covering depth of concrete on performance of structure. Furthermore, deterioration prediction of prestressed concrete bridge girder can be used for the maintenance planning to reduce maintenance cost and extend the service life of structure.
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References
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