Experimental Investigation of the Hybrid FRP-UHPC-Steel Double-Skin Tubular Columns under Lateral Impact Loading
Publication: Journal of Composites for Construction
Volume 24, Issue 5
Abstract
The lateral impact behavior of hybrid fiber-reinforced polymer (FRP)-ultrahigh-performance concrete (UHPC)-steel double-skin tubular columns (DSTCs) was experimentally investigated in this study. Seven specimens, which had an outer diameter of 168 mm and a length of 2,000 mm, were tested under lateral impact loading. Different parameters, including the axial force level, impact energy, concrete type, void ratio, FRP tube thickness, and the presence/absence of the FRP tube, were investigated. The dynamic responses, including global/local damage modes, lateral deflection–time histories, impact force–time histories, strain–time histories, and acceleration–time histories, were investigated. The test results prove that the hybrid UHPC DSTCs exhibit very ductile behavior under lateral impact loading. The hybrid UHPC DSTCs have a higher lateral impact resistance capacity as compared to the hybrid DSTCs infilled with normal-strength concrete. The lateral impact resistance capacity of hybrid UHPC DSTCs with an applied axial force of 200 kN can be improved to some extent compared with those without any axial force. The impact energy, the void ratio, the FRP tube thickness, and the presence/absence of the FRP tube can significantly affect the lateral impact behavior of hybrid UHPC DSTCs. Furthermore, the lateral impact behaviors of hybrid DSTCs, concrete-filled double-skin steel tubes (CFDSTs), and concrete-filled steel tubes (CFSTs) were compared and discussed based on the experimental results in this study as well as in other literature studies.
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Acknowledgments
The authors would like to acknowledge Professors Feng Fan and Xudong Zhi, Harbin Institute of Technology, for their help in carrying out the experiment program. The technical assistances from Drs Rong Zhang, Qijian Wu, and Menghui Guo are greatly appreciated. Moreover, the authors acknowledge the financial support from the China National Basic Research Program (No. 2015CB058002) and the ARC Discovery Project (No. DP160104661).
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Published In
Journal of Composites for Construction
Volume 24 • Issue 5 • October 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Sep 17, 2019
Accepted: Apr 30, 2020
Published online: Jun 26, 2020
Published in print: Oct 1, 2020
Discussion open until: Nov 26, 2020
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