摘要:针对金属结构空间弯扭构件的主流建模方式效率较低的问题，本文提出了基于非均匀有理B样条的参数化金属结构空间弯扭构件建模技术。本文设计了基于非均匀有理B样条的金属结构弯扭构件建模算法与程序架构，通过编程进行了软件实现。该技术具有以下特点：可以处理空间曲线轴线、截面和截面方向的输入并直接生成三维实体；支持参数化的建模与模型修改；所建模型包含工程非几何信息。经分析与实际项目验证，该技术合理可行，能够使建模效率得到大幅提升。

Abstract: Aiming at improving the efficiency of commonly used modeling methods of such members, this paper proposes a NURBS-based parametric modeling method for Metal spatial curved-twisted member. This NURBS-based parametric modeling algorithm and a software design are put forward and applied by programming. The method has following three characteristics: firstly the system can process input of axis, section and directions of section and generate 3D solid model of metal spatial curved-twisted member. Secondly the system supports parametric modeling and modification. Thirdly, the model generated by the system include necessary nongeometric information. The utility of the method and the improvement of efficiency are verified through analysis and modeling experiment of actual engineering project.