Conceptual design of a pedestrian bridge by means of topology optimization

The paper explores structural optimization potentials in Architecture. A design strategy, based on Topology Optimization and Size Optimization, is proposed as a concept design tool. The procedure is applied to the case study of a bridge 50 m long and its shelter. The developed methodology is used to define the support structure and the shelter; the procedure is based on five steps: (i) The first step is performed creating a standard non-rigid steel-deck. Then the non-rigid steel-deck is used to transmit the load-path to the design space in order to achieve the organic shape of the pillars. A new approach is represented by the use of steel plates to transmit the loads from the steel-deck to design space. (ii) Finding of the architectural-structural form of the pillars and the shelter by using a Topology Optimization procedure. (iii) Re-design of the structural skin and shelter; (iv) Optimization of the structural skin; (v) Verification of the entire structure subjected to standard design actions. The results obtained are represented by structural forms that give to the designer several inspirations in order to develop many interpretations and possible solutions varying the design parameters.