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

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

Author(s): Thomas H.-K. Kang, Ju Dong Lee, Bum Sik Lee, Min-Jun Kim, and Kil-Hee Kim

Publication: Structural Journal

Volume: 114

Issue: 05

Appears on pages(s): 1075-1086

Keywords: cyclic loading; design codes; drift capacity; punching failure; reinforced concrete; shear reinforcement; slab-column connections; unbalanced moment

Date: 9/1/2017

Abstract:
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 of provisions for anchorage requirement.