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Title: Cyclic Behavior of HPFRCC Coupling Beams with Bundled Diagonal Bars

Author(s): Sang Whan Han, Jin-Wook Kang, Hyun-Woo Jee, Myoungsu Shin, and Kihak Lee

Publication: IJCSM

Volume: 12


Appears on pages(s):

Keywords: coupled shear wall, coupling beam, diagonal reinforcement, high-performance fiber-reinforced cementitious composite.

DOI: 10.1186/s40069-018-0271-6

Date: 5/30/2018

Coupled shear walls are efficient in resisting lateral forces induced by winds and earthquakes. However, it is difficult to construct coupled shear walls particularly because current design codes require complex reinforcing details within coupling beams. The objective of this study was to develop simple reinforcement details for diagonally reinforced coupling beams; reducing transverse steel by use of high-performance fiber-reinforced cementitious composites (HPFRCCs) and bundling diagonal bars are explored. Four coupling beam specimens with length-to-depth aspect ratios of 2.0 or 3.5 were fabricated and tested under cyclic lateral displacements. The test results revealed that HPFRCC coupling beams with bundled diagonal bars and widely spaced transverse reinforcement (one-half the amount of reinforcement required by current seismic codes) exhibited excellent seismic performance compared with ordinary concrete coupling beams having code-required distributed diagonal reinforcement and transverse reinforcement.