Seismic Performance of Reinforced Concrete Beams with Proposed Lap-Spliced Intermediate Hoops
Publication: Journal of Structural Engineering
Volume 150, Issue 3
Abstract
Two types of lap-spliced intermediate hoops were proposed to address the construction difficulty encountered for conventional intermediate hoops or stirrups used in the plastic hinge regions of beams of special moment-resisting frames. In the proposed type one hoops, a set of U-bars was lap-spliced to the other set of U-bars. The U-bar set was formed by multiple U-bars welded together by the longitudinal holding wires. Weldable steel wire reinforcement was used. In the proposed type two hoops, two three-dimensional stirrups were lap-spliced to form two intermediate hoops. The lap-splice length was based on the Class B tension lap splice of ACI 318. Three full-scale beam specimens, including two specimens with the proposed lap-spliced intermediate hoops and one control specimen with conventional intermediate stirrups, were tested using lateral cyclic loading. Test results showed that the specimens with the proposed lap-spliced intermediate hoops exhibited better drift capacities, energy dissipation ability, and moment strength than the control specimen. The proposed lap-spliced intermediate hoops were more effective in restraining the buckling of longitudinal bars than the conventional closed stirrups.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The authors are grateful to Chien Kuo Construction Co., Ltd., and the National Science and Technology Council (NSTC) of Taiwan under Contract No. 109-2221-E-002-003-MY3 for financial support, and the National Center for Research on Earthquake Engineering (NCREE) of Taiwan for experimental facilities and personnel.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 3 • March 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 5, 2023
Accepted: Oct 23, 2023
Published online: Dec 27, 2023
Published in print: Mar 1, 2024
Discussion open until: May 27, 2024
ASCE Technical Topics:
- Bars (structure)
- Beams
- Concrete
- Concrete beams
- Concrete frames
- Construction engineering
- Construction methods
- Continuum mechanics
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Frames
- Lateral loads
- Materials engineering
- Moment (mechanics)
- Plastic hinges
- Reinforced concrete
- Solid mechanics
- Statics (mechanics)
- Structural dynamics
- Structural engineering
- Structural members
- Structural systems
- Welding
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