Assessing the seismic performance of corroding RC bridge columns Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/b8515r972

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  • Corrosion of reinforcement is recognized as the predominant factor that limits the service life of reinforced concrete (RC) structures exposed to aggressive environments. This corrosion deterioration can lead to damage resulting in capacity loss or even failure. For structures exposed to coastal marine environments or deicing or anti-icing applications, this deterioration is often accelerated. The corrosion deterioration in RC structures has raised significant attention from researchers and analytical studies and experimental tests have been performed worldwide. Durability and serviceability of corroded RC structures have been investigated to determine the relationship between the corrosion process and the service life of these structures and these relationships have been used to develop service life models. Corrosion of the reinforcement could be especially detrimental to the seismic performance of bridge structures and limited efforts have been made to model the structural performance of RC structures exhibiting corrosion during seismic events. The objective of this paper is to first develop a realistic corrosion rate model that represents actual corrosion conditions and then, using this model, develop another model to predict the time-variant seismic performance of RC bridge columns exhibiting corrosion of the steel reinforcement. This information can then be used to optimize design, maintenance, repair, and/or replacement of RC bridges. The service life of RC structures subject to corrosion is comprised of two general phases: the initiation and the propagation phases. Significant efforts have been made in modeling the corrosion initiation phase, but much less efforts have focused on the propagation phase. Different prediction models have been developed to simulate the corrosion process, including empirical models, numerical models (finite element method, boundary element method, and resistor networks and transmission line approach), and analytical models. This study provides a critical review of existing models used to predict the corrosion propagation of steel in RC structures. This review is followed by the development of a new model that incorporates critical parameters for modeling the corrosion propagation phase. The new model is based on the physical process and is calibrated with a set of measured long-term field data. This new model is then used to predict corrosion deterioration of a RC column. The column is then analyzed for seismic performance at different states. A reliability analysis of the lateral capacity of the column is then performed. The example column is for a typical highway bridge built in Oregon during the 1970s.
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