钢-混凝土组合结构技术在大跨无柱车站中的应用研究

Research on the Application of Steel-Concrete Composite Structure Technique in Long-Span Column-Free Station

随着地铁规模的不断扩大,更大的跨度、更宽敞的空间、更舒适的乘坐感成为人民群众的要求。大跨无柱车站通过取消站台层墩柱,可有效地扩大车站结构的使用空间,提升乘客的换乘体验。但大跨无柱的结构形式也给车站的结构设计带来较大的困难。钢-混凝土组合结构力学性能优越,施工便捷,在解决大跨结构的问题中能够获得很好的综合效益。依托徐州市轨道交通3号线南三环车站工程,提出换乘节点车站的钢-混凝土组合结构方案,利用MIDAS Gen建立整体模型进行分析,研究结构的受力性能和关键构件的受力状态。结果表明,采用钢-混凝土组合结构方案能够显著减轻结构自重、节约建筑空间,同时还具有施工方便快捷的优势。建模分析的结果表明,大跨转换梁处于弯剪扭复合受力状态,是设计的要点和难点。最后,针对大跨无柱车站结构采用钢-混凝土组合结构方案时提出了设计建议,可为今后类似工程的建设提供参考。

With the continuous expansion of the scale of the subway,a long span,more spacious space,more comfortable ride feeling has become the requirements of the people.Long-span column-free station can effectively expand the use space of station structure and improve passengers’transfer experience by canceling the pier columns on platform floor.However,the long-span structure without columns also brings great difficulties to the structural design of the station.Steel-concrete composite structure has excellent mechanical properties and convenient construction,and can obtain good comprehensive benefits in solving the problems of long-span structures.Relying on the South Third Ring Station project of Xuzhou Rail Transit Line 3,the steel-concrete composite structure scheme of transfer node station was proposed.MIDAS Gen was used to establish an overall model for analysis,and the mechanical properties of the structure and the stress states of key components were studied.The results showed that the steel-concrete composite structure scheme could significantly reduce the weight of the structure,save the building space,and exhibited the advantages of convenient and fast construction.The results of modeling analysis showed that the long-span transfer beam was in the state of bending,shear and torsion,which was the key point and difficulty of design.Finally,some design suggestions were put forward for the application of steel-concrete composite structure scheme in ws adopted for long-span column-free station structure,which could provide a reference for similar projects in the future.