Computational Technology Resources - CCC

A. Martins, L. Simões, J. Negrão, "Seismic Design Optimization of Concrete Cable-Stayed Bridges with "H"-Shaped Towers", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 9, Paper 5.3, 2024, doi:10.4203/ccc.9.5.3

Keywords: cable-stayed bridges, optimization, seismic action, concrete, cable forces, sizing design variables, shape design variables.

Abstract

An optimization-based strategy for designing concrete cable-stayed bridges under seismic action is presented. An initial designs module provides a convex optimization algorithm with multiple starting solutions from which local optimum solutions are obtained and the least cost solution is selected as the optimum design. The three-dimensional analysis considers dead loads and road traffic live loads, geometrical nonlinearities and time-dependent effects. The modal response spectrum approach is used for seismic analysis. The design is formulated as the cost minimization subject to constraints on the displacements and stresses considering service and strength criteria defined according to the Eurocodes provisions. A constraint aggregation approach is adopted to solve the problem through the minimization of a convex scalar function obtained by an entropy-based approach. The discrete direct method is used for sensitivity analysis. The 64 design variables are the deck and towers’ sizes, the cable-stays' cross-sectional areas and prestressing forces, and the towers’ height. The optimization of a 312 m span bridge illustrates the features and applicability of the proposed strategy. The optimum design features a deck slenderness of 1/130 and a height of the towers (above the deck)-to-main span ratio of 0.205.

download the full-text of this paper (PDF, 14 pages, 967 Kb)

go to the previous paper
go to the next paper
return to the table of contents
return to the volume description

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 9 PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: P. Iványi, J. Kruis and B.H.V. Topping Paper 5.3 Seismic Design Optimization of Concrete Cable-Stayed Bridges with "H"-Shaped Towers A. Martins¹, L. Simões¹ and J. Negrão² ¹ADAI, Department of Civil Engineering, University of Coimbra, Coimbra, Portugal ²Department of Civil Engineering, University of Coimbra, Coimbra, Portugal doi:10.4203/ccc.9.5.3 Full Bibliographic Reference for this paper A. Martins, L. Simões, J. Negrão, "Seismic Design Optimization of Concrete Cable-Stayed Bridges with "H"-Shaped Towers", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 9, Paper 5.3, 2024, doi:10.4203/ccc.9.5.3 Keywords: cable-stayed bridges, optimization, seismic action, concrete, cable forces, sizing design variables, shape design variables. Abstract An optimization-based strategy for designing concrete cable-stayed bridges under seismic action is presented. An initial designs module provides a convex optimization algorithm with multiple starting solutions from which local optimum solutions are obtained and the least cost solution is selected as the optimum design. The three-dimensional analysis considers dead loads and road traffic live loads, geometrical nonlinearities and time-dependent effects. The modal response spectrum approach is used for seismic analysis. The design is formulated as the cost minimization subject to constraints on the displacements and stresses considering service and strength criteria defined according to the Eurocodes provisions. A constraint aggregation approach is adopted to solve the problem through the minimization of a convex scalar function obtained by an entropy-based approach. The discrete direct method is used for sensitivity analysis. The 64 design variables are the deck and towers’ sizes, the cable-stays' cross-sectional areas and prestressing forces, and the towers’ height. The optimization of a 312 m span bridge illustrates the features and applicability of the proposed strategy. The optimum design features a deck slenderness of 1/130 and a height of the towers (above the deck)-to-main span ratio of 0.205. download the full-text of this paper (PDF, 14 pages, 967 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
Back to top	©Civil-Comp Limited 2023 - terms & conditions