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Structural Engineering and Mechanics Volume 73, Number 1, January10 2020 , pages 17-25 DOI: https://doi.org/10.12989/sem.2020.73.1.017 |
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A comprehensive FE model for slender HSC columns under biaxial eccentric loads |
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Tiejiong Lou, Sergio M. R. Lopes, Adelino V. Lopes and Wei Sun
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| Abstract | ||
| A finite element (FE) model for analyzing slender reinforced high-strength concrete (HSC) columns under biaxial eccentric loading is formulated in terms of the Euler-Bernoulli theory. The cross section of columns is divided into discrete concrete and reinforcing steel fibers so as to account for varied material properties over the section. The interaction between axial and bending fields is introduced in the FE formulation so as to take the large-displacement or P-delta effects into consideration. The proposed model aims to be simple, user-friendly, and capable of simulating the full-range inelastic behavior of reinforced HSC slender columns. The nonlinear model is calibrated against the experimental data for slender column specimens available in the technical literature. By using the proposed model, a numerical study is carried out on pin-ended slender HSC square columns under axial compression and biaxial bending, with investigation variables including the load eccentricity and eccentricity angle. The calibrated model is expected to provide a valuable tool for more efficiently designing HSC columns. | ||
| Key Words | ||
| slender columns; high-strength concrete; finite element method; biaxial bending | ||
| Address | ||
| Tiejiong Lou: Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, 430070 Wuhan, China Tiejiong Lou, Wei Sun: Faculty of Engineering and Physical Sciences, University of Southampton, SO17 1BJ Southampton, United Kingdom Sergio M. R. Lopes, Adelino V. Lopes : Department of Civil Engineering, University of Coimbra, 3030-788 Coimbra, Portugal | ||