Title: Shearhead Reinforcement for Concrete Slab to Concrete- Filled Tube Column Connections
Author(s): Jin-Won Kim, Cheol-Ho Lee, and Thomas H.-K. Kang
Publication: Structural Journal
Appears on pages(s): 629-638
Keywords: composite structures; concrete-filled tube; flat plate; punching shear; shear reinforcement; shearheads; slab-column connections
This paper presents full-scale gravity-load test results on 10 concrete-filled tube (CFT) column reinforced concrete (RC) flat plate connections with shearheads. The CFT construction has many structural and constructional advantages over conventional steel and RC column construction. Use of RC flat plate systems in the basement and residential floors of tall buildings is often demanded to reduce story height and enable rapid construction. Combining CFT columns and flat plate flooring is expected to result in synergetic effects. Issues related to connecting CFT columns to flat plates, however, have not yet been fully addressed. Several promising connecting schemes using steel shearheads were proposed and tested in this study. Test results show that the proposed connection can exhibit punching shear strength higher than its RC flat plate counterparts. An empirical model that can reasonably predict the punching shear strength of the proposed connection was also proposed.