(中国建筑西北设计研究院有限公司, 西安 710018)

摘要: 受场地条件限制,西安火车站改扩建工程中新建东配楼结构设计需要考虑多重因素的影响,如避让地裂缝、地铁上盖建筑、施工组织等。 在逐个分析各因素并提出结构应对措施的基础上,建立了结构体系,划分了结构单元。 其中,充分考虑地裂缝及地铁的影响,采取基础主动避让地裂缝的做法,利用地下室斜撑及悬挑桁架的结构措施实现建筑功能和造型要求;在地铁下穿隧道上方布置转换构件以避免上盖建筑和地铁隧道产生不利影响,并提出施工期间对隧道的保护措施。 通过对上部结构进行整体计算分析,悬挑桁架稳定分析、转换梁及桁架承载力计算、钢屋盖和外廊柱计算,楼板应力分析等,验证了各结构单元的可行性和合理性,节点做法上实现了概念设计与计算假定的统一。

关键词: 西安火车站; 地裂缝; 地铁上盖; 悬挑桁架; 转换桁架; 悬挑钢梁; 地铁保护

中图分类号:TU318+. 2 文献标志码:A 文章编号:1002-848X(2022)11-0117-08

DOI:10. 19701 / j. jzjg. XBY2216

Structural design of Xi’ an Railway Station east annex building affected bymultiple factors such as ground fissures

GUO Dong, WEI Sunyin, WU Hongjiao

(China Northwest Architectural Design and Research Institute Co. , Ltd. , Xi’ an 710018, China)

Abstract: Limited by site conditions, multiple factors need to be considered in the structural design of the new east annex building in the reconstruction and expansion project of Xi’ an Railway Station, such as ground fissures avoidance, building above the subway, construction organization, etc. On the basis of analyzing each factor one by one and putting forward structural countermeasures, the structural system was established and the structural units were divided. Among them, fully considering the influence of ground fissures and subway, the practice of actively ground fissures avoidance was adopted, and the structural measures of basement diagonal bracing and cantilever truss were used to realize the building function and modeling requirements. The transfer members were arranged above the subway underpass tunnel to avoid adverse effects between the superstructure and the subway tunnel, and the tunnel protection measures were proposed during construction.  Through the overall calculation and analysis of the superstructure, the stability analysis of cantilever truss, the bearing capacity calculation of transfer beam and truss, the calculation of steel roof and outside corridor columns, and the floor stress analysis, the feasibility and rationality of each structural unit were verified, and the joint methods realizes the unity of the conceptual design and calculation assumptions.

Keywords:Xi’ an Railway station; ground fissure; building above the subway; cantilever truss; transfer truss; cantileversteel beam; subway protection