CONSEQUENCES OF CORROSION ON THE STRUCTURAL INTEGRITY OF PARKING GARAGE DECKS

摘要

The objective of this study was to assess the effect of corrosion on the punching shear capacity of parking garage decks. Two parking structure decks were cast for this study: a control one; 0% of mass loss, and a corroded one; 26% of mass loss of flexural reinforcement. A uniform level of corrosion was reached by using an accelerated corrosion technique. In this technique a direct current with a constant volt was applied across the main reinforcement bars to reach a corrosion level of 26% of mass loss. In order to ensure the highest probability of a punching failure mode, the corrosion was localized in the punching area. The experimental results are presented in terms of load vs. deflection curves, load vs. crack width curves, crack patterns, deflection profiles, slab rotations, and concrete strain profiles. The experimental results revealed that there was a high correlation between the calculated mass loss (according to Faraday's law) and the real mass loss in the corroded reinforcing bars due to accelerated corrosion. The test results indicated that 26% corrosion of the steel reinforcement led to 19% drop in punching shear resistance and a 20.5% reduction in the slab stiffness. In addition, the capacity of the corroded slab fell below the design capacity according to A23.3-04 building code. This is a pilot study and the results of the full experimental program should aid in the evaluation of corrosion damage on the structural integrity of parking garage decks.