Performance of Shearbands in Concrete Slab-Column Connections

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Title: Performance of Shearbands in Concrete Slab-Column Connections

Author(s): Thomas H.-K. Kang and Hong-Gun Park

Publication: Special Publication

Volume: 287

Issue:

Appears on pages(s): 1-16

Keywords: shearbands; slab-column connections; shear reinforcement; reinforced concrete; performance; seismic.

Date: 5/1/2012

Abstract:
This paper deals with concrete slab-column connections reinforced with shearbands, covering the performance under gravity and combined gravity and cyclic lateral loads. Prior and recent test results from the U.K., U.S. and Korea are summarized. The recent tests conducted at Seoul National University revealed that the shearbands were more effective in increasing punching shear resistance, deformability and energy dissipation than headed studs under the same testing conditions (e.g., flexural and shear reinforcing ratios, gravity shear ratio = ~0.45, etc.). Engaging only a few slab bars was sufficient for anchorage. The top and bottom bends appeared to play a significant role in providing shearband anchorage. For the cyclic lateral tests (Kang and Wallace, 2008; Park et al., 2011), the constant gravity load was maintained by continuously jacking up the column bottom during seismic testing of the slab-column connections. This was the same method used for all connections in each seismic test program. The details of all the testing programs and design oversights are discussed. Finally, practical applications of shearbands in North America and Australia are introduced.