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

摘要： 景观桥梁的造型以结构受力合理为基础，加以感性的艺术表现，常形成复杂的异形空间曲面，复杂的桥梁造型增大了设计和建造难度。为了分析景观桥梁三维模型的数据表达，通过参数化策略简化设计过程，基于Rhino Grasshopper平台，开发了一种批量提取景观桥梁三维模型数据的方法，分5步进行：分段、切割、细分、提取坐标及输出数据；将方法应用于西宁市滨河西路景观桥梁设计和建造实例进行验证。结果表明：设计参数最大误差0.5%，证明方法有效，设计效率和建造品质得到大幅提升；编写的程序算法具有通用性，为统计工程量、批量出图等BIM应用提供了思路，有助于推进BIM正向设计。

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