关键词: 桥梁工程；异形空间曲面；参数化策略；数据批量提取方法；BIM正向设计

Abstract: The design of landscape bridges is based on reasonable structural stress, combined with emotional artistic expression, often forming complex special-shaped spatial curved surfaces. The complex bridge design increases the difficulty of design and construction. In order to analyze the data expression of the three-dimensional model of landscape bridge, a method to extract the three-dimensional model data of landscape bridge in batches based on Rhino Grasshopper software platform was developed by simplifying the design process through parametric strategy. The proposed method included five steps: segmenting, cutting, subdividing, extracting coordinates and outputting data. The proposed method was applied to the design and construction of Binhe West Road landscape bridge in Xining city. The results show that the maximum error of design parameters is 0.5%, which proves that the proposed method is effective, greatly improving design efficiency and construction quality. The written program algorithm has universality, providing ideas for BIM applications such as engineering quantity statistics and batch output of drawing and helping to promote BIM forward design.

Key words: bridge engineering; special-shaped space curved surface; parametric strategy; batch extraction method of the data; BIM forward design