Structural BIM technology refers to the process and methodology of managing information throughout the entire lifecycle of engineering structures by utilizing information technology to create structural models. Originating from general BIM technology, it inherits BIM’s core features, including management processes and the capability to generate model outputs. However, structural engineering currently occupies a somewhat awkward position within the BIM system. This is primarily because the modeling requirements in structural design differ significantly from those in other disciplines.
When comparing architectural and structural design, the focus on information representation varies. Architectural design emphasizes expressing the spatial relationships, arrangement, and visual forms of building components such as beams and columns, aiming to capture the aesthetic reality of buildings. In contrast, structural engineering analyzes the connections between components from a mechanical viewpoint, focusing on the true load-bearing capacity of the structure.
The perspective from which a model is created also influences its form. Currently, 3D models used in construction are typically categorized into three types based on modeling techniques: wireframe models, surface models, and solid models.
- Wireframe models use line elements as their foundation, constructing points, lines, and arcs into a basic three-dimensional framework. These models are often employed to represent the building’s outline and fundamental structure.
- Surface models are built by describing the exterior surfaces of 3D objects using planes and quadratic surfaces. They excel at surface representation, aiding in visualizing exterior designs and can also be used for finite element mesh generation.
- Solid models utilize basic voxels like cubes, cylinders, spheres, and rings to create three-dimensional solids through Boolean operations or transformations such as stretching and rotation. They contain complete geometric and topological information and can be simplified into surface or wireframe models for analysis.
During architectural design, solid models are favored because their comprehensive geometric and topological data make editing and modification easier. Designers commonly create three-dimensional solid BIM models using geometric and core modeling software. However, in structural analysis, wireframe models are more prevalent as they align with the mechanical simplification concept inherent in structural design. These simplified models facilitate various structural calculations and analyses.
In later construction and operational stages, where visualization and virtual simulation are critical, surface models are better suited. Additionally, applications such as fire simulation (FDS), energy consumption analysis, and lighting analysis benefit from surface models, which offer better processing capabilities than solid models and richer expression than wireframe models.
In practice, surface and solid models are closely related. For example, surfaces can be transformed into solids by stretching or rotating, making conversion between these two models relatively straightforward. However, due to differences in data completeness and limitations in format and interface conversion, efficiently and accurately converting between wireframe and solid models remains challenging.
Traditionally, structural design models have evolved from architectural models. In the 2D era, the limited complexity of drawing information posed few issues. However, with the advent of 3D modeling and BIM, differences in model information representation have made collaboration between disciplines more difficult. Outdated model information can hinder progress, underscoring the unique specificity of structural engineering within the BIM environment.
Therefore, to achieve full lifecycle management of structures through structural BIM technology, the foremost priority is to develop BIM models tailored to structural engineering needs. In summary, the study of structural BIM technology focuses on applying BIM methods to structural engineering, enabling structural BIM models to integrate seamlessly into the broader BIM ecosystem alongside architecture and construction disciplines, thereby facilitating effective information sharing across professions.
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