Parametric Design for Composite Bridges

“Parametric Design for Composite Bridges”. Bridge designs usually exhibit significant geometric variations between different structural solutions, which implies a low degree of reuse of the models in similar projects. To overcome this limitation, a parametric approach is presented as an answer since it enhances the bridge design process, increasing efficiency by reducing time and effort. The proposed methodology is based on the creation of a flexible geometric model through the introduction of parameters and numerical relationships between them. Therefore, from a generative development, different geometric and structural solutions of composite bridges could be created by modifying the parameters’ values within the same model. The present work aims to define the workflow for a multi-girder composite bridge project based on the parametric design for 3D modelling, structural analysis, and optimization. It describes the methodology implemented, starting with the design of the geometrical model script into a visual programming interface, Grasshopper, that runs inside Rhinoceros. Thanks to Grasshopper-Tekla live link, the 3D model is generated by using a set of Grasshopper components that can create and interact with objects in Tekla Structures. Afterwards, the algorithm for FEM analysis is created with Karamba3D, a plug-in that allows continuing working in a Grasshopper environment, integrating parameterized geometric models and finite element analyses. Finally, an optimization process is defined to reduce material waste and achieve an efficient design. The resulting workflow integrates BIM and parametric design to explore and create high-potential designs, with complex geometries, and to find the best cost-effective solutions.