Mechanical Anchorage in Exterior Beam-Column Joints Subjected to Cyclic Loading

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Title: Mechanical Anchorage in Exterior Beam-Column Joints Subjected to Cyclic Loading

Author(s): Sung Chul Chun, Sung Ho Lee, Thomas H.-K. Kang, Bohwan Oh, and John W. Wallace

Publication: Structural Journal

Volume: 104

Issue: 1

Appears on pages(s): 102-113

Keywords: anchorage; beam-column joint; reinforcement

DOI: 10.14359/18438

Date: 1/1/2007

Abstract:
The effectiveness of headed bars terminating in exterior beam-column joints was assessed. Nine inter-story and five roof-level joint specimens were tested under reversed cyclic loading, where the primary test parameters were the anchorage type, the size and arrangement of the beam bars and the heads, and the detailing provided for roof joints. The test results indicate that hysteretic behavior of the exterior joints constructed with headed bars was similar or superior to joints constructed and tested with hooked bars commonly used in Korean practice. Head size with a net area of three to four times the bar area was sufficient to anchor the beam reinforcement effectively within the exterior beam-column joint. The test results also indicate that, in addition to providing vertical U-bars at roof joints, heads on column bars should extend beyond the beam top bars to provide improved behavior.


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