In the context of BIM (Building Information Modeling), the model itself represents the core value of the technology. Both building design and information management rely heavily on the model’s extension. Essentially, the model serves as the fundamental platform and framework for BIM’s development and functional expansion.
Given the critical role models play in BIM applications, they act as the primary carriers of BIM processes. When designing commercial complexes, models from various disciplines—architecture, structural engineering, and electromechanical systems—are integrated to form a comprehensive model. Due to the complexity of commercial complex models, the modeling phase demands significant time and effort, making it essential to understand the key value points during this phase.
(1) Civil Engineering Models: Walls and Stairs
Civil engineering models form the foundation of BIM models, as other discipline models are built upon them. Therefore, the accuracy, depth, and efficiency of civil engineering models directly impact the entire design process. Besides major elements like walls, stairs, doors, and windows, detailed components such as steps, handrails, and reserved openings also significantly influence model quality.
(2) Structural Models: Beams, Slabs, and Columns
Structural models encompass beams, slabs, columns, foundations, piles, and steel structures. Since BIM models support one-click measurement and calculation functions that assist in cost estimation and project settlement, the structural model must be detailed and precise. This includes the steel reinforcement model, which is particularly challenging due to the complex shapes and sizes of rebar within beams, slabs, columns, and pile foundations. Continuous exploration of modeling methods tailored to project specifics is required to improve accuracy and efficiency.
(3) Mechanical and Electrical Pipeline Models
Though the mechanical and electrical pipeline components are relatively few in commercial complex BIM models, frequent pipeline intersections and clashes make their integrated modeling a key challenge. Managing conflicts in these systems remains a major focus during model development.
(4) Exterior Facade Models
Commercial complexes often serve as urban landmarks, making facade design critical for recognition and aesthetic appeal. Facades must balance architectural beauty, constructability, and functionality, using a blend of materials, colors, shapes, and proportions to meet design goals. Recently, abstract facade styles featuring double-curved and other complex surfaces have become popular, adding new challenges to BIM modeling.
(5) Skylight Models
Skylights are essential components in commercial complexes, providing natural lighting and smoke ventilation. Traditionally, skylight designs aligned with indoor pedestrian street models tend to be regular due to strict area and opening constraints. However, as commercial spaces aim to enhance customer experiences, irregular skylights featuring curved and arched surfaces are increasingly common. Modeling these complex skylight components has become a vital aspect of BIM in commercial complex design.
(6) Landscape and Greening Models
Landscape architecture maintains a certain degree of independence from other disciplines, with few cross-disciplinary interfaces. However, there are many overlaps between landscape models and small municipal infrastructure within site boundaries. Conflicts between landscape elements and municipal facilities are common issues encountered during construction.
(7) Interior Design Models
Interior design represents the final phase of architectural presentation, especially crucial in commercial complexes focusing on environmental experience. Elements like ceilings, lighting fixtures, and decorative components often share interfaces with the mechanical and electrical systems, leading to frequent clashes. To avoid costly demolition and rework later, these cross-disciplinary conflicts should be addressed early during the modeling stage.
Song Wenqiang (Xinjiang University)
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