摘要:本文研究了基于BIM的大型钢结构虚拟施工仿真系统并应用于实际工程之中。大型钢结构施工具有环境因素复杂、操作要求高、安全隐患多等特点，且难以周全考虑。针对这些难点，Unity3d和BIM结合的虚拟施工仿真系统，能够充分利用并可视化工程设计信息，逼真的展现不同情境下的施工现场，可用于施工现场管理和技术交底，全面排查各种质量安全隐患。该系统在杭州上城区体育中心大跨度钢桁架施工中的成功应用，大大提高了施工效率，充分保障了施工过程中的质量与安全。

Abstract: This paper studies a BIM-based virtual construction simulation system for large steel structures and its application in construction project. Environmental complexity, high requirement for operation and multiple potential safety hazards are the basic features of the construction for large steel structures, which are difficult to be considered thoroughly. Aiming at solving those difficulties, the virtual construction simulation system integrates Unity3d and BIM, which can fully utilize and visualize the information of construction design. It is able to help build a virtual construction site scene which vividly displays various circumstances, and can be applied for construction management, technical disclosure, as well as thorough check for potential quality and safety hazards. The system has been successfully applied in the large-span steel truss construction process of Hangzhou Shangcheng District Sport Center project, which evidently enhanced construction efficiency and fully guaranteed the quality and safety in construction process.