Computational Technology Resources - CCP

R. Belevicius¹, A. Juozapaitis², D. Rusakevicius³ and D. Šešok¹

¹Department of Information Technologies, Vilnius Gediminas Technical University, Lithuania
²Department of Bridges and Special Structures, Vilnius Gediminas Technical University, Lithuania
³Department of Engineering Mechanics, Vilnius Gediminas Technical University, Lithuania

Keywords: under-deck stayed bridge, topology, shape and sizing optimization, evolutionary algorithm, pattern search.

Summary

Under-deck stayed bridges are effective structural systems formed by a rigid beam supported from beneath by an arrangement of struts and stays. The optimal scheme of these bridges can be sought tuning a large set of parameters of different character: the number of typical struts-stays sections in the longitudinal direction, topology schemes and widths of the each section, the heights of struts, and the dimensions of the cross-sections of all structural elements. Mathematically, the optimization of the bridge structure is a mixed topology/shape/sizing optimization problem with a different number of design variables, some integer variables, subject to strength, stability and displacement constraints for different loading cases. The optimization problem is converted to unconstrained optimization using a penalization technique. The objective function is evaluated by a special program connected to an optimization algorithm as a "black box". A three-stage optimization technique has been proposed for solving similar problems of structural optimization. First, an evolutionary algorithm with variable-length genotype ascertains the promising range of leading design parameters. Since some design variables are interdependent, special operators have been suggested for the mutation, crossover, and genome repair. Second, the obtained results have been verified by optimization with a standard evolutionary algorithm having a constant genotype length. Third, the findings can be improved using consecutive pattern search. A typical plane 24 m bridge has been optimized employing the proposed technique.

purchase the full-text of this paper (price £20)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £50 +P&P)

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 109 PROCEEDINGS OF THE FOURTH INTERNATIONAL CONFERENCE ON SOFT COMPUTING TECHNOLOGY IN CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING Edited by: Y. Tsompanakis, J. Kruis and B.H.V. Topping Paper 12 Topology, Shape and Sizing Optimization of Under-Deck Stayed Bridges R. Belevicius¹, A. Juozapaitis², D. Rusakevicius³ and D. Šešok¹ ¹Department of Information Technologies, Vilnius Gediminas Technical University, Lithuania ²Department of Bridges and Special Structures, Vilnius Gediminas Technical University, Lithuania ³Department of Engineering Mechanics, Vilnius Gediminas Technical University, Lithuania doi:10.4203/ccp.109.12 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Topology, Shape and Sizing Optimization of Under-Deck Stayed Bridges", in Y. Tsompanakis, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Fourth International Conference on Soft Computing Technology in Civil, Structural and Environmental Engineering", Civil-Comp Press, Stirlingshire, UK, Paper 12, 2015. doi:10.4203/ccp.109.12 Keywords: under-deck stayed bridge, topology, shape and sizing optimization, evolutionary algorithm, pattern search. Summary Under-deck stayed bridges are effective structural systems formed by a rigid beam supported from beneath by an arrangement of struts and stays. The optimal scheme of these bridges can be sought tuning a large set of parameters of different character: the number of typical struts-stays sections in the longitudinal direction, topology schemes and widths of the each section, the heights of struts, and the dimensions of the cross-sections of all structural elements. Mathematically, the optimization of the bridge structure is a mixed topology/shape/sizing optimization problem with a different number of design variables, some integer variables, subject to strength, stability and displacement constraints for different loading cases. The optimization problem is converted to unconstrained optimization using a penalization technique. The objective function is evaluated by a special program connected to an optimization algorithm as a "black box". A three-stage optimization technique has been proposed for solving similar problems of structural optimization. First, an evolutionary algorithm with variable-length genotype ascertains the promising range of leading design parameters. Since some design variables are interdependent, special operators have been suggested for the mutation, crossover, and genome repair. Second, the obtained results have been verified by optimization with a standard evolutionary algorithm having a constant genotype length. Third, the findings can be improved using consecutive pattern search. A typical plane 24 m bridge has been optimized employing the proposed technique. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £50 +P&P)
Back to top	©Civil-Comp Limited 2023 - terms & conditions