No abstract

No abstract

Experimental investigations were carried out to examine the seismic performance of corroded reinforced concrete (RC) columns with sparsely distributed ties (under‐confined columns). Four full‐scale specimens were cast, corroded, and tested in this study. One specimen followed current seismic guidelines and acted as control column, while other three columns with larger tie spacing represented precode era under‐confined columns. Two of the three under‐confined columns were corroded to 15 and 30% corrosion degrees using a precalibrated accelerated corrosion regime. The entire study was intended to quantify the effect of inadequate confinement and corrosion on seismic response of RC columns. The results showed that the sparsely distributed transverse reinforcement resulted in lowering lateral strength and deformability of RC Columns. When these under‐confined columns were deteriorated by corrosion, their structural performance was found to have degraded significantly. It was observed that the specimens with 15 and 30% corrosion had 23 and 37.1% lower lateral load capacity respectively with respect to their un‐corroded counterpart. Furthermore, the observed lower values of ductility factors and other essential performance indicators manifested the adverse effects of inadequate confining reinforcement and aging‐related corrosion.

No abstract

No abstract