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Title: Experimental Study on Restraining Headed Bars in Roof- Exterior Connection

Author(s): Jang-Woon Baek and Thomas H.-K. Kang

Publication: Structural Journal

Volume: 118

Issue: 6

Appears on pages(s): 251-265

Keywords: concrete capacity design; concrete side-face blowout failure; headed bar; head-restraining bar; knee joint; prying action; roof-level exterior beam-column connection

DOI: 10.14359/51732851

Date: 11/1/2021

Abstract:
For roof-level exterior beam-column connections, the design requirement associated with side-face blowout failure for restraining headed bars can be alleviated by considering the concrete contribution. To evaluate concrete strength, investigation of the safety against side-face blowout failure of such knee-joint connections is deemed warranted. In this study, existing experimental tests for roof-exterior beam-column connections were reviewed and a cyclic loading test for a full-scale roof-exterior connection specimen was performed to examine concrete side-face blowout strength. In addition, the head-restraining bar area required in the current ACI 318 design provision and in the original ACI 349-97 design provision was evaluated. Results indicate that the head-restraining bar area required in ACI 349-97 was sufficient to prevent concrete side-face blowout failure for both Type 1 and 2 specimens. For conservative design, an explicit equation was also proposed for design of head-restraining bars in roof-level exterior connections.