中小型火车站站房屋盖结构简化计算方法

Simplified Calculation Method of Small and Medium-sized Railway Station Roof Structure

中小型铁路车站站房候车大厅常采用上部为正放四角锥网架屋盖,下部为钢筋混凝土框架结构的结构体系.以沪昆高铁平坝南站站房为例,采用3D3S结构设计软件分别建立了站房整体模型与网架单独模型.通过在下部简化结构模型的各柱顶施加单位水平力,计算下部结构柱顶的水平刚度,引入这一刚度进行网架单独建模.对比分析了网架结构单独模型与整体模型的跨中挠度、支座反力和杆件轴力.研究表明,提出的单独网架模型与整体网架模型相比,网架结构受力性能非常接近,下部结构支座反力的偏差也在可接受范围内,验证了引入下部结构刚度的网架结构简化计算方法的合理性.

The upper part of small and medium-sized railway station waiting hall often adopts pyramid space grid and the lower part often adopts the reinforced concrete frame. Based on the South Station of Pingba in the Shanghai-Kunming High-speed Railway, integrated analysis model and the separated analysis model are built by 3D3S. By applying unit horizontal force on the pillars, horizontal stiffness of substructure pillars are calculated and introduced into the separate analysis model. A comparative analysis of the deflection, support reaction and bar axial force of grid revealed that the structural behavior of the upper space grid structure is similar and deviations of reacting force of grid structure between two models are within the acceptable range, so as to verify the reliability of simplified calculation method of medium-sized railway station building structure.