Abstract
The use of de-icing salts on reinforced concrete (RC) car-park flat slab buildings is known to corrode the reinforcement, which may adversely affect the punching shear strength of the slab-column connections. The consequence of the punching shear failure of slab-column connections can be catastrophic, as the failure of one connection can easily spread to others and eventually leads to the progressive collapse of the flat-slab structure. To study the effects of corrosion of the flexural reinforcement on the punching shear behavior of slab-column connections, twelve full-scale RC slab-column connections were constructed and tested in this study. The experimental program was divided into two stages: 1) accelerated corrosion test; and 2) punching shear test. It was found that the rebar corrosion can change the failure mode of the connection from flexural or shear-flexural failure to punching shear and reduce the punching shear strength significantly. Moreover, the existing design formulas given by ACI 318–19, CSA 23.3–14, Eurocode 2, and BS 8110–97 were found to be unreliable for the prediction of the punching shear strength of corroded slab-column connections. The critical shear crack theory (CSCT) was modified in this work to predict the punching shear strength of the corroded slab-column connection well.
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