某三心圆柱面大跨度网壳结构设计与优化

Design and optimization of a large-span three centered cylindrical latticed shell structure

结合某煤场封闭工程,采用MST软件,按照规范要求建立大跨度三心圆柱面网壳结构模型,并对其进行设计与优化。研究结果表明:大震作用下,大跨度网壳结构局部腹杆产生塑性铰,未产生较大变形,满足"大震不倒"要求;撤除支座处水平系杆释放杆件应力,可大幅度减小支座反力;通过优化支座可简化施工工艺,缩短施工周期;伸缩缝增设弦杆,优化檩条连接节点,可减少网壳钢结构用钢量。

Based on a project of enclosed coal yard,MST2016 is used to establish a large-span three center cylindrical latticed shell structure model according codes,and its design and optimization are carried out. The results show that: under rare earthquake,the local web members of large-span latticed shell structure produce plastic hinge without large deformation,which meets the requirement of "no collapse under rare earthquake",the horizontal tie bars at the supports are removed to release the stress of the members,which greatly reduce the reaction forces of the supports,construction process can be simplified and the construction period can be shortened by optimizing the supports,adding chord in expansion joint and optimizing purlin joint can reduce steel consumption.