Form-finding with Restraint Topology Optimization of a Curved Shell-Supported Footbridge under Vertical and Horizontal Loads

Fenu, Luigi;Hosseini, Alireza

;Punzo, Stefano;Briseghella, Bruno;Giaccu, Gian Felice

2024-01-01

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Abstract

This study investigates the design of curved shell-supported footbridges, focusing on form-finding under various multi-directional load cases. The design process integrates a form-finding algorithm and genetic optimization, utilizing parametric coding for simultaneous structural analysis through the finite element method and topological optimization. Optimization is carried out within defined constraints, employing a strategy that prioritizes overall structural efficiency, supported by penalty functions. The principal objective of this research is to develop a structural optimization methodology specifically for anticlastic curved shell-supported footbridges. This methodology emphasizes the impact of different loading directions, particularly crucial in areas susceptible to seismic activity, on the optimal configuration of bridge design. It involves modifying the topology of bridge supports and adjusting control points for the Bezier curve that defines the curved deck’s shape. This approach not only adapts to a variety of load scenarios but also enhances the structural integrity and functionality of the bridges. The findings of this investigation offer valuable insights into highly effective techniques for optimizing the design of curved shell-supported footbridges, particularly when subjected to seismic forces.