Experimental and Numerical Analysis of Prestressed Prefabricated Self-Centering IMS Composite Frame Joints
Publication: Journal of Structural Engineering
Volume 149, Issue 9
Abstract
Full-scale model tests of three integral prestressed prefabricated frame structure system (IMS) prestressed friction joint specimens under low cyclic loading were conducted to explore the factors influencing the hysteretic behavior of a new joint. The use of a high-strength grouting material (steel fiber) for joints was found to delay the damage of the grouting material under repeated loads and cause reduction of effective prestress. Additionally, replacing the prestressed reinforcement with unbonded prestresssed reinforcement in the precast column and the open channel near the column maximized the deformation capacity of the structure and reduced the structural damage and stiffness degradation in later stages. With an increase in the length of the unbonded section, the peak load of the specimen decreased and the energy consumption was worsened. To enhance the energy consumption of the joint, this study proposes a hybrid connection joint between the energy-consuming and prestressed reinforcements in the open slot. Using ABAQUS numerical modeling and analysis, the joint structure was further optimized and the variations in the energy consumption capacity of the hybrid joint with the position of the prestressed reinforcement, the proportions for the local weakening of energy-dissipating reinforcement, and the bonding mode were obtained. The numerical results demonstrated that the seismic performance index of the hybrid joint was comparable to or even higher than that of the cast-in-situ joint and indicated excellent self-centering and damage recover capacity.
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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
We thank the Science and Technology Project of Beijing Earthquake Agency (BJWC2023006), and China Scholarship Council (CSC202006430085) for the funding. This work was supported by the Beijing Natural Science Foundation–funded projects (No. 8164061), and in part by the National Natural Science Foundation of China (NSFC) (No. 51578539), and the Special Fund for Open Research of Large Multi-functional Vibration Array Laboratory of Beijing University of Architecture (No. 20220908).
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Published In
Journal of Structural Engineering
Volume 149 • Issue 9 • September 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 18, 2022
Accepted: May 17, 2023
Published online: Jul 11, 2023
Published in print: Sep 1, 2023
Discussion open until: Dec 11, 2023
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