基于IFC的轨道交通BIM构件标准库研究

针对轨道交通工程的建筑信息模型(building information modeling，BIM)建模方法不统一、信息不规范，导致 BIM 模型数据难以在后期有效统一应用的弊端，研究基于工业基础类(industry foundation classes，IFC)标准的轨道交通 BIM 构件标准库。首先，根据轨道交通工程各专业构件的表达需求，研究构件类型、构件信息的 IFC表达，以及适配 IFC 标准的扩展机制；其次，提出轨道交通 BIM 构件标准库技术框架，主要包括基础数据层、技术支撑层、应用场景层、用户层；然后，采用国家标准的分类编码方法定义轨道交通各专业 BIM 构件的分类编码，设计了构件信息模板，规范各专业构件的属性信息及其资源链接方式；最后，研究 BIM 构件模型的加解密方法，以保障轨道交通工程 BIM 模型数据的安全性。研究结果表明，通过搭建统一的 BIM 构件标准库，能够促进参建方采用标准化的 BIM 构件模型创建轨道交通 BIM 项目模型，保障 BIM 模型的规范性。

IFC-based BIM Component Standard Library forRail Transit Engineering

Considering the drawbacks of inconsistent building information modeling (BIM) methods and non-standardinformation in rail transit engineering, it is difficult to effectively and uniformly use BIM model data. Therefore, the IndustryFoundation Classes (IFC)-based BIM component standard library for rail transit engineering was studied. First, the componenttypes, IFC expression of component information, and IFC-based extensibility mechanisms were studied according to theexpression requirements of rail transit engineering components. Second, the technology framework of the BIM componentstandard library for rail transit engineering was proposed, including basic, technical, application, and user layers. Third, theclassification and code method in the national standard was used to define the classification and code of these BIM components,and a component information template was proposed to define the component properties and their resource links. Finally,encryption and decryption methods for the BIM component model were applied to ensure the security of the BIM model data.The results showed that the proposed unified BIM component library enabled project participants to use standardized BIMcomponent models to create a project model for rail transit engineering, ensuring the standardization of BIM models.