Study on Detailings for Reinforced Concrete Coupling Beams of Shear Walls
Date Issued
2012
Date
2012
Author(s)
Chang, Yu-Hsuan
Abstract
Ductile coupled shear wall is an efficient lateral-force-resisting system, which is usually placed at the service core of tall building. Previous research found that diagonal detailings are indispensable to develop the ductile behavior of coupling beams with small span-to-depth ratios. Construction of diagonally reinforeced coupling beams is very difficult due to the orientation of diagonal reinforcement. Thus, hybrid beam that contains both constructability and structural behavior is a possible solution. Hybrid beam resist shear force by the vertical components of inner diagonal bars, and flexure by the outer longitudinal bars and the horizontal components of inner diagonal bars.
Eight full-scale specimens were designed to study the behavior of coupling beam under different apect-ratios, reinforcement detailing (diagonal, hybrid, rhombic) and concrete strength. Simultaneously, the force-transferring mechanism of coupling beams was also investigated.
Test results indicate that the hybrid detailing is an effective solution to balance the requirement of structural behavior and constructability. The effect of diagonal reinforcement is most effective when its orientation is parallel to the axis of concrete compression strut. Therefore, diagonal reinforcement is more effective for the coupling beams with small span-to-depth ratios. It is also found that concrete strength is useful to enhance the seismic behavior of coupling beam. Coupling beams are prone to buckling when detailed using longitudinal or diagonal bars with smaller size.
Subjects
reinforced concrete coupling beams
reduced diagonal reinforcement
hybrid beam
double curvature
force-transferring mechanism
Type
thesis
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