Simplified Numerical Modeling of Axially Loaded Circular Concrete-Filled Steel Stub Columns
Publication: Journal of Structural Engineering
Volume 143, Issue 12
Abstract
Behavior of concrete-filled steel tubular (CFST) columns can be predicted accurately using detailed finite-element (FE) modeling, but such models are tedious to build and impractical for frame analysis. In contrast, computationally efficient fiber beam element (FBE) models can achieve the balance between accuracy and simplicity, and can be utilized for advanced analysis of structural systems. In FBE models, however, the material models themselves have to account for the interaction between the steel tube and core concrete. Therefore the accuracy of a FBE model depends mainly on the input material models. Although there are a few FBE models available in the literature for CFST columns, these models may not be suitable for some cases, especially when considering the rapid development and application of high-strength materials and/or thin-walled steel tubes. This paper proposes versatile, computationally simple, yet accurate steel and concrete models based on detailed FE modeling results of circular CFST stub columns under axial compression. The material models are then implemented in FBE modeling and the prediction accuracy is verified with a wide range of test data.
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Acknowledgments
This study is supported by Western Sydney University under the International Postgraduate Research Scholarship scheme. This support is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 3, 2016
Accepted: May 30, 2017
Published online: Oct 4, 2017
Published in print: Dec 1, 2017
Discussion open until: Mar 4, 2018
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