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Title: Cyclic Behavior of Beams with Double-Perimeter and Continuous-Stirrup Hoops

Author(s): Yu-Chen Ou, Hermawan Sutejo, Jyun-Lin Huang, and Sheng-I Yen

Publication: Structural Journal

Volume: 121

Issue: 3

Appears on pages(s): 187-200

Keywords: closed stirrups; deformation capacity; energy dissipation; hoops; plastic hinge region; reinforced concrete beams; reinforcement buckling; special moment frames

DOI: 10.14359/51740485

Date: 5/1/2024

Two types of hoop layouts, double-perimeter hoops (DPH) and continuous-stirrup hoops (CSH), were examined in this research for beams of special moment frames. Compared to conventional hoops (CH), the DPH and CSH have the advantage of better constructability. Full-scale beam specimens—specimen CH as a control specimen and specimens DPH and CSH as test specimens—were tested using lateral cyclic loading to examine their seismic performance. Test results showed that although specimen DPH violated the Code requirement for the number and spacing of laterally supported longitudinal bars, the specimen still exhibited seismic performance sufficient for beams of special moment frames. Specimen CSH showed better seismic performance than the control specimen (CH). The better performance of CSH was mainly attributed to the better concrete confinement and reinforcing bar buckling restraint ability of the intermediate hoops of the CSH than the intermediate stirrups of the CH.