Currently, bridge design is at the forefront of BIM technology application, which is the most mature and widely used in this field. Unlike building construction projects, most bridge design—including both appearance and structural aspects—is carried out solely by bridge designers. These designers must ensure the bridge’s safety, reliability, functionality, durability, and cost-effectiveness, while also harmonizing its appearance with the surrounding landscape. This makes bridge design a uniquely diverse and complex task.
Traditionally, designers begin with a preliminary draft of the bridge plan, then create 2D drawings using CAD. After calculating the internal forces of the bridge structure through finite element analysis software, they modify the drawings accordingly. Any dimensional changes to bridge components require updates to the plan, elevation, and section views in the 2D drawings. Thanks to BIM’s five key features—visualization, parameterization, simulation, optimization, and graphing—bridge designers can quickly build 3D parametric models, verify the stiffness and strength of local components, efficiently update the 3D models, and generate 2D drawings from these models.
Rapid Parametric Modeling
BIM enables rapid parametric modeling by using established bridge skeleton lines combined with locally parameterized bridge components, often referred to as “families” in core BIM software. These “families” represent collections of similar spatial components classified by their shapes. Using a “skeleton + template” approach, designers build the 3D bridge model incrementally, improving the overall structure with modular building blocks.
For these blocks, universal templates can be created with adjustable properties such as size, spacing, material, and visibility. This allows designers to quickly generate local bridge components with similar shapes but different sizes and materials by simply modifying these parameters.
Due to the unique nature of each bridge—determined by geographical location and span—designers often face variations in local component details between projects. This makes it difficult to reuse the same “family” components directly. As a result, designers frequently create custom parametric components to meet modeling requirements. Many design firms and construction companies maintain libraries of parameterized components for common bridge types—such as four-pile abutments, T-beams, and gravity piers—that support efficient 3D modeling of simpler bridges. However, for irregular, complex, or extra-large bridges, these components often require modification before use.
Bridge Model Analysis
Structural design of bridges involves analyzing not only overall stiffness, strength, and stability but also verifying local components. For the overall model, the bridge’s actual stress states are processed into conditions suitable for finite element analysis (FEA) software simulation. At this stage, detailed BIM data is no longer directly applicable.
Currently, data exchange between BIM modeling software and bridge-specific FEA software remains a challenge, complicating comprehensive structural analysis. While some BIM platforms include built-in FEA tools—such as Autodesk Robot Structural Analysis in Revit and Abaqus for CATIA—these are generally less user-friendly and lack dedicated bridge design standards compared to specialized software like Midas Civil.
For local component verification, designers can extract parts from the complete 3D bridge model in software like CATIA. These components are imported into AbaqusforCATIA for finite element preprocessing—including element definition, meshing, boundary condition application, and loading—and then analyzed in Abaqus using exported files in INP format.
Engineering Quantity Estimation
Traditionally, quantity estimation during the bridge design phase is done manually or with Excel spreadsheets based on points, lines, and surfaces in 2D plans. While this approach is accurate for regularly shaped components, it only provides approximations for more complex parts. Moreover, any design changes require recalculation of affected quantities, increasing redundant work and decreasing efficiency.
With BIM technology, these challenges are effectively addressed. In CAITA, a core BIM modeling software, designers can assign materials to bridge components and use built-in measurement tools to quickly and accurately calculate quantities. This accelerates complex estimations and minimizes errors caused by manual simplifications.
3D Collaborative Design
To improve efficiency in traditional bridge design workflows, 3D collaborative design has been introduced via BIM platforms. This approach allows all project members to work within the same environment and standards on a single bridge design project. Different specialists collaborate seamlessly, sharing accurate information and communicating in real time throughout the design process.
Major software providers have integrated collaborative features to support this workflow. Examples include Dassault Systèmes’ VPM and Revit’s Link functionality.
In VPM’s 3D collaborative environment, all designers work online on the same data objects. Design changes are saved on the VPM server, ensuring immediate availability to all team members and minimizing inefficiencies caused by delayed updates. VPM also enforces permission controls based on roles and contexts, protecting models from unauthorized alterations.
Must log in before commenting!
Sign Up