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Structural Engineering and Mechanics Volume 43, Number 6, September25 2012 , pages 795-821 DOI: https://doi.org/10.12989/sem.2012.43.6.795 |
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Multiobjective size and topolgy optimization of dome structures |
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Talaslioglu Tugrul
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| Abstract | ||
| The size and topology of geometrically nonlinear dome structures are optimized thereby minimizing both its entire weight & joint (node) displacements and maximizing load-carrying capacity. Design constraints are implemented from provisions of American Petroleum Institute specification (API RP2A-LRFD). In accordance with the proposed design constraints, the member responses computed by use of arc-length technique as a nonlinear structural analysis method are checked at each load increment. Thus, a penalization process utilized for inclusion of unfeasible designations to genetic search is correspondingly neglected. In order to solve this complex design optimization problem with multiple objective functions, Non-dominated Sorting Genetic Algorithm II (NSGA II) approach is employed as a multi-objective optimization tool. Furthermore, the flexibility of proposed optimization is enhanced thereby integrating an automatic dome generating tool. Thus, it is possible to generate three distinct sphere-shaped dome configurations with varying topologies. It is demonstrated that the inclusion of brace (diagonal) members into the geometrical configuration of dome structure provides a weight-saving dome designation with higher load-carrying capacity. The proposed optimization approach is recommended for the design optimization of geometrically nonlinear dome structures. | ||
| Key Words | ||
| dome structure; geometrically nonlinear; NSGAII; API RP2A-LRFD | ||
| Address | ||
| Talaslioglu Tugrul: Department of Civil Engineering, Osmaniye Korkut Ata University, 8000, Osmaniye, Turkey | ||