EVALUATION OF SEISMIC PERFORMANCE OF PILE-SUPPORTED STRUCTURE WITH LOCAL STEEL BAR CORROSION AND PROPOSAL OF ITS MAINTENANCE METHOD

Abstract

 The objective of this study is to analytically clarify the effect of steel bar corrosion on the seismic performance of the entire pile-supported structure, and to then propose an appropriate maintenance method for pile-supported structures with steel bar corrosion, based on the analytical results.
 First, a steel corrosion model using RC beams was proposed and verified. Then, the structural performance of the corroded RC beams was analyzed. Concurrently, loading experiments of the RC beams were conducted to verify the analyses. After confirming the validity of the analysis, the constitutive law of RC beams with various corrosion patterns was calculated by cyclic loading analysis. The seismic performance of the pile-supported structure with several combinations of this constitutive law was analyzed to clarify the relationship between local steel bar corrosion and the seismic performance of the whole structure. Finally, an appropriate maintenance method was proposed based on the analytical results.