TIME DEPENDENT DEGRADATIONS IN EARTHQUAKE RESISTANT STRUCTURES CORROSION DAMAGES ON RC ELEMENTS

It was known that substantial reductions on structural performance of RC buildings was observed in time. Corrosion phenomena resulted from corrosive environmental effects is the primary cause of them. It causes bond degradation and slip, cracking and softening in concrete, reductions in cross-sectional area and mechanical properties of reinforcement steel in RC elements. The most effective one is the bond-slip phenomenon among these degradations. In this study, RC structural elements are modelled by regarding possible implications of rebar corrosion including bond-slip effect. In this context, pushover analyses are performed on a selected RC building model and the results are examined according to corrosion scenarios and variables considered in these scenarios. Findings showed that considerable changes are observed especially in column sectional capacities by depending rebar corrosion. In addition, it was observed that the bond-slip phenomenon has adverse effects on column sections. By depending on corrosion level, the aroused reductions in capacities are deteriorated the moment-curvature relationship of structural elements and this could change the type of behavior from ductile to non-ductile.