Behavior of Stud Shear Connectors with Increasing Concrete Strength
Publication: Practice Periodical on Structural Design and Construction
Volume 27, Issue 3
Abstract
To investigate the mechanism for the enhanced load-bearing capacity of stud connectors owing to an increase in concrete strength, the push-out test is analyzed using nonlinear finite-element (FE) models. A distinct failure mode is observed, and proofs are collected to explain the mechanism of studs with higher strength concrete. The results show that a stud with ultrahigh-performance concrete (UHPC) yields to the plastic failure initiating on the bottom surface of the stud shank and propagating through the cross section near the weld collar. The failure mode is different from that of normal-strength concrete (NSC). The local reinforcing effects, like the confinement effects on concrete strength, improved tensile strength, and constraint of the weld collar, provide a stronger constraint around the foot of the stud shank and account for the distinct failure mode. As a result, the local reinforcing effects should be included to improve the FE prediction accuracy. Underestimating the strength of studs with UHPC, the simplified method neglecting local effects may lead to a conservative design since the local reinforcing effects are neglected.
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Data Availability Statement
All data, models, and code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research reported herein was carried out as part of the research projects granted by the National Natural Science Foundation of China (51978245) and China Scholarship Council (201906715010).
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Published In
Practice Periodical on Structural Design and Construction
Volume 27 • Issue 3 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 12, 2021
Accepted: Mar 5, 2022
Published online: May 27, 2022
Published in print: Aug 1, 2022
Discussion open until: Oct 27, 2022
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