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大容量机组空冷支架结构属质量和刚度沿竖向分布不均匀的竖向混合结构,结构的扭转效应明显,地震作用复杂。大直径钢筋混凝土薄壁管柱为结构的主要抗侧力构件和耗能构件,结构抗震防线过于单一。强烈地震作用下,混凝土管柱底部及柱顶钢桁架连接部位为抗震设计的关键部位。目前,对大容量机组空冷支架结构抗震设计缺乏系统研究,国家相关规范对这方面内容很少涉及。为了确保空冷支架结构的安全,在模型抗震性能试验和大直径薄壁管柱承载力试验的基础上,提出了大容量机组空冷支架结构抗震设计方法和抗震构造措施。
The structure of air-cooled scaffolds in large capacity units is a vertical hybrid structure with uneven quality and stiffness distributed vertically. The torsional effect of the structure is obvious and the earthquake action is complicated. Large-diameter reinforced concrete thin-walled tubular column structure for the main anti-side force components and energy-saving components, structural anti-seismic line is too simple. Under strong earthquake, the connection of the bottom of concrete column and steel truss at the top of column is the key part of anti-seismic design. At present, the lack of systematic research on the aseismic design of air-cooled scaffolds for large-capacity units has little to do with the relevant national norms. In order to ensure the safety of air-cooled scaffolding structure, on the basis of the model seismic performance test and the test of the bearing capacity of large-diameter thin-walled tubular string, the aseismic design method and anti-seismic structure of air-cooled scaffolds for large capacity units are proposed.