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Multi-Objective Optimization Applied to the Design of Sustainable Pedestrian Bridges

Author

Listed:
  • Fernando Luiz Tres Junior

    (Graduate Program in Civil and Environmental Engineering (PPGEng), University of Passo Fundo, Km 292, BR 285, Passo Fundo 99052-900, RS, Brazil)

  • Víctor Yepes

    (Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València, 46022 Valencia, Spain)

  • Guilherme Fleith de Medeiros

    (Graduate Program in Civil and Environmental Engineering (PPGEng), University of Passo Fundo, Km 292, BR 285, Passo Fundo 99052-900, RS, Brazil)

  • Moacir Kripka

    (Graduate Program in Civil and Environmental Engineering (PPGEng), University of Passo Fundo, Km 292, BR 285, Passo Fundo 99052-900, RS, Brazil)

Abstract

The demand for more sustainable structures has been shown as a growing tendency, and engineers can use optimization techniques to aid in the design and sizing stage, achieving solutions that minimize its cost and environmental and social impacts. In pedestrian bridges, which are subjected to human-induced vibrations, it is also important to ensure the users’ comfort, besides the security verifications. In this context, the objective of this paper is to perform a multi-objective optimization of a steel-concrete composite pedestrian bridge, minimizing cost, carbon dioxide emissions, and vertical acceleration caused by human walking. For this, the Multi-Objective Harmony Search (MOHS) was applied to obtain non-dominated solutions and compose a Pareto Front. Two scenarios were considered with different unit emissions obtained from a life cycle assessment in the literature. Results show that by increasing 15% the structure cost, the vertical acceleration is reduced from 2.5 to 1.0 m/s 2 . For both scenarios, the optimal ratio for the web height and total span ( L e ) lies between L e /20 and L e /16. The web height, the concrete strength, and the slab thickness were the design variables with more influence on the value of the vertical acceleration. The Pareto-optimal solutions were considerably sensitive to the parameters varied in each scenario, changing concrete consumption and dimensions of the welded steel I-beam, evidencing the importance of carrying out a sensitivity analysis in optimization problems.

Suggested Citation

  • Fernando Luiz Tres Junior & Víctor Yepes & Guilherme Fleith de Medeiros & Moacir Kripka, 2023. "Multi-Objective Optimization Applied to the Design of Sustainable Pedestrian Bridges," IJERPH, MDPI, vol. 20(4), pages 1-15, February.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:4:p:3190-:d:1065480
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    References listed on IDEAS

    as
    1. Cleovir José Milani & Víctor Yepes & Moacir Kripka, 2020. "Proposal of Sustainability Indicators for the Design of Small-Span Bridges," IJERPH, MDPI, vol. 17(12), pages 1-23, June.
    2. United Nations UN, 2015. "Transforming our World: the 2030 Agenda for Sustainable Development," Working Papers id:7559, eSocialSciences.
    3. Ioannis Kougias & Nicolaos Theodossiou, 2013. "Multiobjective Pump Scheduling Optimization Using Harmony Search Algorithm (HSA) and Polyphonic HSA," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(5), pages 1249-1261, March.
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