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Steel and Composite Structures Volume 40, Number 6, September25 2021 , pages 817-828 DOI: https://doi.org/10.12989/scs.2021.40.6.817 |
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A new procedure for post-buckling analysis of plane trusses using genetic algorithm |
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Shaahin Bidmeshki and Alireza Habibi
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| Abstract | ||
| In this research, a new minimization-based controlled method was proposed to analyze steel plane truss structures undergoing large deformations. Non-linear solution was acquired by minimizing a constrained optimization problem via the genetic algorithm. The suggested procedure can directly predict buckling load and its corresponding displacements, and precisely trace equilibrium path of geometrically non-linear plane truss structures. A computer program was formed to anticipate both elastic pre- and post-buckling behaviors or any arbitrary point on equilibrium path of the structures subjected to abnormal loads. Notably, a load-deflection curve with multiple limit points and a complex snap-back phenomenon can be followed using the proposed method. Five truss examples were analyzed, and the acquired results were compared with those obtained by theoretical solution, modified arc-length, Newton-Raphson methods, and those reported in the literature to validate robustness and accuracy of the proposed procedure. | ||
| Key Words | ||
| buckling; genetic algorithm; geometric nonlinearity; limit points; minimization; truss | ||
| Address | ||
| Shaahin Bidmeshki: Department of Civil Engineering, University of Kurdistan, Sanandaj, Iran Alireza Habibi: Department of Civil Engineering, Shahed University, Tehran, Iran | ||