Currently, the bridge design process is generally divided into several sequential stages: conceptual design, scheme design, preliminary design, and construction drawing design. Each stage produces specific deliverables. For instance, the conceptual design stage defines the bridge type and span, delivering renderings and animations. The preliminary design stage results in initial drawings, calculation sheets, and preliminary quantity estimates. Finally, the construction drawing stage provides detailed drawings, construction plans, and comprehensive quantity tables. Therefore, selecting appropriate Autodesk software tailored to each stage’s requirements is essential to meet project demands effectively.
Compared to traditional design methods, the most significant advantage of bridge design based on BIM technology is the creation of core 3D models. These models serve as integrated digital deliverables representing the project’s engineering information. From these models, various outputs can be generated, including renderings, animations, structural analysis, drawings, optimized designs, and information updates. This shared model data fosters collaboration across disciplines. However, due to current software limitations, BIM skills gaps, and exploratory practices, full BIM implementation remains challenging.
In this context, the author uses Revit as the primary modeling tool, supplemented by Autodesk Infraworks, NavisWorks, and others, positioning BIM modeling as the central deliverable of the design phase. This approach represents a comprehensive integration of project information and proposes a practical bridge BIM parametric design workflow.
(1) Conceptual Design Stage: This stage emphasizes bridge functionality, aesthetics, and engineering performance. Designers can leverage the Dynamo plugin in Revit to transform concepts or hand sketches into 3D models. By adjusting parametric variables such as span, beam height, cross-section, and curvature, the design’s visual appeal, structural soundness, and constructability can be evaluated. The final conceptual model that meets all criteria is selected for further development.
(2) Scheme Design Stage: Here, the conceptual model is refined, and a 3D representation of the surrounding terrain and environment is created using Infraworks. This enables a visual presentation of the design scheme within a realistic 3D context, verifying span layouts, component sections, navigation conditions, and more. For complex bridge types, multiple conceptual schemes are developed using BIM, considering terrain, navigation, and technical challenges to support decision-making.
Continuing with Revit and Infraworks, the finalized scheme model can be exported to software such as Lumion and NavisWorks for photorealistic rendering and animated presentations, enhancing scheme communication and reporting. The key advantages over traditional methods include:
① BIM design solutions provide immersive 3D visualization. Unlike traditional CAD, which relies on 2D drawings requiring extensive spatial imagination and professional interpretation, BIM offers multi-angle, segmented spatial views, facilitating efficient and intuitive communication.
② BIM enables precise cost control. Parameterized, information-rich models allow for accurate and efficient extraction of engineering quantities, supporting meticulous project cost management.
(3) Preliminary Design and Construction Drawing Stage: This phase involves further refining the scheme model by enhancing details and defining component dimensions. Due to the need to balance client requirements, form, structural integrity, constructability, and cost, iterative revisions are necessary. This stage includes extensive modifications to component sizes, material choices, and construction methods.
Traditional design methods require substantial time and resources to update drawings and calculation models repeatedly, resulting in inefficiencies. In contrast, BIM focuses on modifying the parametric 3D model. Adjusting specific variable values triggers automatic updates throughout the entire bridge model. Using Autodesk Revit, the 3D geometric model is imported and enriched with information such as quantities, materials, manufacturers, and costs. Revit can then generate construction drawings and calculate quantities via section views and other 2D perspectives, reducing workload and improving productivity.
Additionally, components requiring detailed finite element analysis can be exported in SAT format for import into Abaqus software, enabling precise structural evaluation.
(4) Construction Phase: The completed 3D bridge model facilitates project scheduling, construction animation simulations, clash detection, and more. Potential construction issues can be anticipated and addressed proactively, minimizing risks during execution.
The Revit-based integrated information model can be imported into NavisWorks, which offers collision detection, volume calculations, cost estimating, and 3D walkthrough capabilities to support construction management. Both NavisWorks and Revit being part of the Autodesk ecosystem ensures maximum data fidelity, reducing information loss and errors throughout the workflow.
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