Concrete-Filled Elliptical Hollow Section Beam-Columns under Seismic Loading
Publication: Journal of Structural Engineering
Volume 146, Issue 8
Abstract
The seismic behavior of elliptical hollow section (EHS) beam-column members was examined in this study. A comprehensive experimental investigation was conducted on 14 concrete-filled and four bare steel EHS beam-column specimens under combined compression and cyclic bending. The main testing parameters were tube wall thickness, axial load ratio, and bending direction. Among other findings, it was revealed that the bare steel specimens failed in local buckling, whereas the concrete-filled members exhibited more diverse failure modes, including local buckling, a fracture of the steel section following local buckling, and an abrupt fracture of the steel section with no evident local buckling. The failure modes largely depended on the bending direction. Due to the beneficial effects of material hardening and steel-concrete interaction, the moment resistance obtained from the test was consistently larger than the predicted plastic moment resistance. In addition, the specimens exhibited satisfactory ductility and energy dissipation performance, and both characteristics could be effectively improved by either increasing the compactness of the steel section or by applying the concrete infill. The strength, ductility, and energy dissipation characteristics of the specimens subjected to biaxial bending fell between the cases of major-axis and minor-axis bending. Based on the test results, the existing design methods for predicting the moment resistance of the considered members were evaluated. A preliminary design equation for ductility prediction was also proposed.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The financial support from the National Natural Science Foundation of China (NSFC) with Grant Nos. 51778456 and 51922064 is gratefully acknowledged. Support for this study was also provided by a research grant from the State Key Laboratory for Disaster Prevention in Civil Engineering (Grant No. SLDRCE19-B-07) and the Shanghai Gaofeng Grant.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 8 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 19, 2019
Accepted: Feb 6, 2020
Published online: May 20, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 20, 2020
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