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Structural Engineering and Mechanics Volume 92, Number 6, December25 2024 , pages 587-601 DOI: https://doi.org/10.12989/sem.2024.92.6.587 |
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Size optimization of truss structures for sequential loading scenario using evolutionary algorithms |
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Mohit Kumar, Ayush K. Choudhary and Angshuman Mandal
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| Abstract | ||
| Evolutionary algorithm-based size optimization of plane and space truss structures is studied for sequential loading scenarios. Size optimization of a truss is a search for the most suitable cross-sectional areas of the truss members from the available design spaces. The novelty of the present work lies in developing an evolution-based algorithm that can consider the sequential loading scenario while designing the planner and space trusses. Fortran-based computer programming has been developed for the proposed optimization method considered here. A standard displacement-based finite element method is implemented to obtain the trusses' nodal displacement and elemental stresses. To assess the performance of the proposed algorithm three plane trusses (3-bar, 18-bar, and 200-bar) and three space trusses (22-bar, 25-bar, and 72-bar) with various displacement and stress constraints under sequential loading have been considered. The optimum weights obtained from all the problems considered here have been analyzed and compared with the same, as obtained from other methods mentioned in the existing literature. It is important to note here that the results are in close agreement and in some cases optimum weights obtained from the present study are even better than the earlier results. Finally, a real-life design problem of an industrial roof truss has been considered to assess the applicability of the proposed algorithm. The convergence study and optimum crosssection of the truss have been reported as a case study. | ||
| Key Words | ||
| evolutionary algorithms; finite element analysis; FORTRAN programming; sequential loading; size optimization; truss structures | ||
| Address | ||
| Mohit Kumar, Ayush K. Choudhary and Angshuman Mandal: Civil Engineering Department, Birla Institute of Technology Mesra, Patna Campus, Patna, 800014, India | ||