Earthquake resistance design needs to be applied in the potential seismic zone, especially for public infrastructure such as bridges to guarantee the life safety. For an existing bridge, material degradation due to corrosion effect needs to be considered to evaluate the condition of the bridge. Material degradation modeling due corrosion is expressed as spalling of the cover concrete, degradation of mechanical properties of reinforced steel and reduction of bond effect between concrete and steel. This material degradation is affect into structural capacity to resist the seismic force during the earthquake in its service time.
This thesis present the bridge evaluation with material degradation due to the corrosion effect by modify the material properties of reinforced concrete. Since the practical analysis for the bridge structure usually using common and easy-using (commercial) program such as SAP2000 and Xtract, the evaluation with material degradation is expressed to fit on that kind of software.
The evaluation method on this paper is done by modeling material properties related to the corrosion effect to analyze sectional structure using Xtract and modeling existing bridge structure in Taiwan with pushover analysis using SAP2000 to evaluate the capacity of the bridge with material degradation due to corrosion. From the analysis result can be seen that the energy dissipation and performance capacity of the structure in pushover analysis is reduced due to corrosion in its service year.

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