特高压柔直换流站阀厅屋盖结构选型与优化

  目的]  特高压柔性直流阀厅屋盖跨度远超以往工程，传统采用的梯形钢屋架结构体系已无法适用。  方法]  在无经验可供借鉴的情况下，文章结合特高压柔性直流换流站阀厅的工艺特点，对阀厅大跨度屋盖的结构设计进行了研究，确定了大跨度阀厅屋盖的合理结构形式，并从网架层数、网架高度、节点形式、网格形式方面入手，对柔性直流大跨度阀厅的网架屋盖进行了优化设计。  结果]  研究表明:优化后的三层斜放四角锥网架屋盖有良好的结构性能和经济效益，是特高压柔性直流阀厅屋盖适宜采用的一种优良结构形式。  结论]  优化后的网架屋盖结构形式可供类似工程借鉴。

Structural Selection and Optimal Design of Long Span Roof for VSC-UHVDC Valve Hall

  Introduction]  In voltage sourced converter based ultra-high voltage direct current (VSC-UHVDC) converter station, the roof span of valve hall far exceeds the previous project, and the traditional trapezoidal steel truss structure is no longer applicable.  Method]  In the absence of experience for reference, the structural design of long span roof was studied based on the characteristics of the VSC-UHVDC valve hall, and a reasonable structural type was confirmed. Starting from the number of grid layers, the height of grid, the form of joints and the form of grid, the optimal design of the long span space grid roof was carried out.  Results]  The results show that the optimized three-layers diagonal square pyramid grids roof has good structural performance and economic benefits, and is an excellent structural form the long span roof of VSC-UHVDC valve hall.  Conclusion]  The optimized structure of the grid roof can be used for reference by similar projects.