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Computers and Concrete Volume 32, Number 6, December 2023 , pages 595-606 DOI: https://doi.org/10.12989/cac.2023.32.6.595 |
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Unified prediction models for mechanical properties and stress-strain relationship of dune sand concrete |
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Said Ikram Sadat, Fa-xing Ding, Fei Lyu, Naqi Lessani, Xiaoyu Liu and Jian Yang
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| Abstract | ||
| Dune sand (DS) has been widely used as a partial replacement for regular sand in concrete construction. Therefore, investigating its mechanical properties is critical for the analysis and design of structural elements using DS as a construction material. This paper presents a comprehensive investigation of the mechanical properties of DS concrete, considering different replacement ratios and strength grades. Regression analysis is utilized to develop strength prediction models for different mechanical properties of DS concrete. The proposed models exhibit high calculation accuracy, with R2 values of 0.996, 0.991, 0.982, and 0.989 for cube compressive strength, axial compressive strength, splitting tensile strength, and elastic modulus, respectively, and an error within +-20%. Furthermore, a stress-strain relationship specific to DS concrete is established, showing good agreement with experimental results. Additionally, nonlinear finite element analysis is performed on concrete-filled steel tube columns incorporating DS concrete, utilizing the established stress-strain relationship. The analytical and experimental results exhibit good agreement, confirming the validity of the proposed stress-strain relationship for DS concrete. Therefore, the findings presented in this paper provide valuable references for the design and analysis of structures utilizing DS concrete as a construction material. | ||
| Key Words | ||
| dune sand concrete; finite element analysis; mechanical properties; stress-strain relationship | ||
| Address | ||
| Said Ikram Sadat, Fei Lyu and Naqi Lessani: School of Civil Engineering, Central South University, Changsha 410075, China Fa-xing Ding: 1) School of Civil Engineering, Central South University, Changsha 410075, China, 2) Engineering Technology Research Center for Prefabricated Construction Industrialization of Hunan Province, Changsha 410075, China Xiaoyu Liu and Jian Yang: The 1st Engineering Co., Ltd of China Railway Urban Construction, Changsha, 410023, China | ||