京沪高铁南京南站主站房结构设计研究

Structural design of Nanjing South Railway Station for Beijing-Shanghai express railway

南京南站主站房采用建桥合一的复杂框架结构,列车在站房首层顶板通过、停靠。首层结构作为承轨层采用型钢混凝土框架结构,顶板沿南北向分成7段,各项结构性能应同时满足民用及铁路桥涵规范的要求。层2采用钢管混凝土柱-钢桁架共同组成的框架结构,为减小顶板温度区段长度,通过在桁架侧伸出牛腿设置限位滑动支座的方法,将楼面分成3段。屋面结构采用双向正交正放钢网架,为加强整体刚度未设置温度缝。主站房结构自下而上形成"7-3-1"的复杂结构分段体系。结构设计中,采用三维实体建模整体分析计算,列车及相关荷载作为特殊工况计入计算模型中,以保证计算精度满足要求。鉴于工程规模宏大,设计中采用多点输入地震反应的时程分析法进行了抗震补充计算,根据分析结果对相关部位进行加强。还就列车振动对站房舒适度的影响、CFD方法在工程中的应用、关键构件及斗拱节点的设计进行了介绍。

The project of Nanjing South Railway Station uses building-bridge combined complex frame structure, the train will stop or go through the elevated station. The first-floor structure which directly bears the train loads uses steel reinforced concrete composite frame structure, the roof is divided into 7 sections along the north and south, the frame structural performance should meanwhile satisfy the requirements of civil and railway bridge and culvert codes. The level 2 uses frame structure in which concrete-filled steel tube column and steel truss are combined. In order to reduce the length of roof temperature segment, the roof is divided into 3 sections by limit sliding supports installed on the corbels which overhang on the trusses. The roof structure uses the bidirectional orthogonal space truss, where the temperature seam is not interposed in order to enhance the overall roof stiffness. The building structure of the main station consists of a thorough ＂7-3-1＂ complex structure system. The usage of three dimensional entity computation model into which the train and correlating loads were put as special operating modes and overall analysis computation, can guarantee to meet the computation precision requirement. Concerning broad scale of the project, multi-point input seismic response time-history analysis was complementally used and the correlating components were strengthened according to the analysis result. The influence of train vibration on the station building comfort level is also introduced, the application of CFD method and the key components as well as the ＇ dougong＇ node design etc.