Analytical and Finite-Element Modeling of FRP-Concrete-Steel Double-Skin Tubular Columns
Publication: Journal of Bridge Engineering
Volume 20, Issue 8
Abstract
This paper presents a finite-element (FE) analysis of hybrid fiber-reinforced polymer (FRP)-concrete-steel double-skin tube (FSDT) in the form of columns. The FSDT columns that were examined consisted of a concrete wall sandwiched between an outer FRP tube and an inner steel tube. A FE software was used to develop a pushover analysis of three-dimensional FSDT models to simulate seismic loading. The FE models were validated against the experimental results gathered from seven FSDT columns tested under cyclic loading. The FE analysis results were in good agreement with the experimental backbone curves. The maximum error was 9% in predicting the bending strengths of the columns. A parametric study evaluated the effect of axial load level, concrete wall thickness, concrete strength, diameter-to-thickness ratio () of the steel tube, and number of FRP layers on the FSDT columns’ behavior. This study revealed that the behavior of FSDT columns is quite complex. It also revealed that this behavior is controlled by the interactions that occur among the steel tube’s stiffness, the concrete wall’s stiffness, and the FRP hoop’s stiffness. Local buckling occurred in all of the specimens examined. This buckling caused the FSDT system to rupture. Two modes of failure were defined as follows: (1) steel/concrete compression failure, and (2) FRP rupture. Compression failure was relatively gradual whereas failure due to FRP rupture was quite abrupt. Finally, the bending strength increased as the applied axial load, concrete compressive strength, and number of FRP layers increased. The bending strength also increased as both the concrete wall’s thickness and the decreased.
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Acknowledgments
This research was conducted by Missouri University of Science and Technology and was supported by Missouri DOT (MODOT), Mid-American Transportation Center (MATC), and National University Transportation Center (NUTC). This support is gratefully appreciated. However, any opinions, findings, conclusions, and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Bridge Engineering
Volume 20 • Issue 8 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 3, 2014
Accepted: Aug 28, 2014
Published online: Sep 23, 2014
Published in print: Aug 1, 2015
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