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Structural Engineering and Mechanics Volume 88, Number 1, October10 2023 , pages 25-42 DOI: https://doi.org/10.12989/sem.2023.88.1.025 |
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Analysis and design of eccentrically loaded lightweight aggregate concrete-encased steel slender columns |
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Mostafa M.A. Mostafa
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| Abstract | ||
| This paper presents a finite element (FE) simulation of eccentrically loaded lightweight aggregate concrete-encased steel (LACES) columns with H-shaped steel sections, analytical equations are also established to estimate the columns' axial and bending moment interaction capacities. The validity of the proposed models is checked by comparing the results with experimental data. Good agreements between the test and proposed models' results are found with acceptable agreements. Moreover, design parameters, including the lightweight aggregate concrete (LWAC) strength, eccentricity, column slenderness ratio, and confinement, are studied using the FE analysis, and their efficiency factors are discussed. The results show that the ultimate axial capacity of the LACES composite columns subjected to eccentric loading is negatively affected by the increase in the columns' height, but it is positively affected by the increase of the confinement. Increasing the eccentricity and columns' height reduced the columns' stiffness. In addition, the ultimate capacity of the LACES column is significantly influenced by the LWAC strength and eccentricity, where the ultimate capacity of the LACES column is significantly increased by increasing LWAC strength, and it is remarkably decreased by increasing the eccentricity. When the eccentricity changed from zero to 70 mm, the ultimate axial capacity and stiffness decreased by 67.97% and 63.56%, respectively. | ||
| Key Words | ||
| concrete encased steel (CES) composite column; eccentric behavior; FE analysis; interaction diagram (ID); lightweight aggregate concrete (LWAC); steel reinforced concrete (SRC) | ||
| Address | ||
| Mostafa M.A. Mostafa: Civil Engineering Department, Faculty of Engineering, Al-Azhar University, Qena 83513, Egypt | ||