Mechanical Performance of Puzzle-Shaped Shear Connectors Subjected to Fully Reversed Cyclic Stress
Publication: Journal of Structural Engineering
Volume 149, Issue 7
Abstract
Recent innovations in composite dowels have led to the realization that robust hybrid systems can provide excellent strength and stiffness. In this contemporary era, puzzle-shaped and modified clothoid-shaped shear connectors are attracting interest, particularly in Europe. Their popularity stems from their outstanding shear capacities and their ease of manufacturing by virtue of having a single cutting line. Moreover, earlier studies based on pushout tests have proven this fact. Composite beams in buildings experience fully reversed cyclic stress between compression and tension during seismic events. When the concrete slab starts to crack under tensile stress, the shear capacity of the composite dowel can deteriorate considerably. Nevertheless, the influence of this cyclically applied stress on mechanical performance remains unclear. This study specifically examined puzzle-shaped shear connectors, with cyclic loading tests conducted using a component model of the composite beam, which can carry the various stress histories to the concrete slab. In all, findings obtained from 14 specimens with several influential factors clarified the cyclic behaviors and stress transfer mechanisms of puzzle-shaped shear connectors. Based on the experimentally obtained results, the applicability of existing evaluation equations was investigated with respect to the ultimate shear strength and shear force–slip displacement relation. Results indicate that those formulas overestimate the mechanical capacities of composite dowels under fully reversed cyclic stress. For that reason, this study has led to an evaluation formulation of mechanical performance that reflects the stress history effects. Ultimately, this study has proven that the proposed equations can assess the ultimate shear strength and shear force–slip displacement accurately while embracing simplicity.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was funded by JSPS KAKENHI Grant No. 20H00290. We express our deepest gratitude for their support.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 16, 2022
Accepted: Mar 9, 2023
Published online: May 3, 2023
Published in print: Jul 1, 2023
Discussion open until: Oct 3, 2023
ASCE Technical Topics:
- Beams
- Composite beams
- Composite materials
- Construction engineering
- Construction methods
- Continuum mechanics
- Dowels
- Dynamics (solid mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Fastening
- Forces (type)
- Material mechanics
- Material properties
- Materials engineering
- Shear forces
- Shear strength
- Shear stress
- Solid mechanics
- Strength of materials
- Stress (by type)
- Stress history
- Structural analysis
- Structural engineering
- Structural members
- Structural systems
- Tensile strength
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Cited by
- Atsushi Suzuki, Yoshihiro Kimura, Yoriyuki Matsuda, Kazuhiko Kasai, Rotation Capacity of I-Shaped Beams with Concrete Slab in Buckling-Restrained Braced Frames, Journal of Structural Engineering, 10.1061/JSENDH.STENG-12550, 150, 1, (2024).