Punching and Lateral Cyclic Behavior of Slab-Column Connections with Shear Bands: Fid-Bau Portal

Punching and Lateral Cyclic Behavior of Slab-Column Connections with Shear Bands

Thomas H-K Kang

Given the increasing use of shear bands for slab-column connections as an alternative to stirrups and other types of shear reinforcement, punching and lateral cyclic behavior of reinforced concrete (RC) slab-column connections with shear bands was experimentally investigated. A total of six half-scale specimens of RC interior slab-column connection subassemblies were constructed on the same day. Of six specimens, three were tested under monotonically increased gravity loads and three under the combined effects of constant gravity and reversed cyclic lateral loads. Control specimens had no shear reinforcement, while closed stirrups and modular shear bands without punched holes were used for the shear-reinforced specimens. The slabs were heavily reinforced to limit the degree of flexural yielding prior to punching failure, and associated with gravity shear ratios of approximately 0.5 when subjected to lateral loads. The test results and comparison with current design codes indicate that the performance of the shear bands was equivalent to or better than that of the closed stirrups and that the code provisions for stirrups are applicable to shear bands, with the exception ofprovisions for anchorage requirement.