(1 中国建筑科学研究院有限公司, 北京 100013; 2 中国铁路设计集团有限公司, 天津 300142;3 国家建筑工程技术研究中心, 北京 100013)

摘要: 北京朝阳站至五环路段(里程 DK14+400~DK15+050)封闭式声屏障垂直轨线方向的结构跨度约 40m,采用大跨度混凝土拱壳结构形式. 结构拱形由斜线+圆弧+抛物线组成,满足建筑限高和景观要求;在拱顶抛物线段设置预应力平衡拉索,以平衡高位局部拱结构的推力,显著改善主拱结构和拱脚基础的受力状态. 主拱之间的混凝土薄壳采用预制装配式壳板,通过优化 SP 预应力空心板和主拱结构的连接节点构造,提升主体结构施工效率的同时保证结构连接的可靠性. 设计过程中,充分考虑施工组织方案,按照多个施工阶段进行包络设计;主拱结构各阶段的变形验算均满足规范要求,进行了拱结构的整体稳定性分析. 主拱基础采用设反倾角的重力式混凝土条形基础形式,基础设计过程中充分考虑各种不利设计工况,充分保证基础设计的安全性.

关键词: 北京朝阳站; 封闭式声屏障; 大跨度混凝土拱壳; 预应力平衡拉索; 预制装配式壳板; 施工分析

中图分类号:TU375. 5 文献标志码:A 文章编号:1002-848X(2023)12-0049-06

DOI:10. 19701 / j. jzjg. 20201365

Structural design and research of large-span concrete arch shell in enclosed sound barrier

CHENG Weihong1,3, ZHANG Gaoming1,3, LIU Feng1,3, DANG Hui2

(1 China Academy of Building Research, Beijing 100013, China; 2 China Railway Design Corporation, Tianjin300142, China; 3 National Engineering Research Center of Building Technology, Beijing 100013, China)

Abstract: Large-span concrete arch shell structure during the Beijing ChaoYang Railway Station to the Fifth Ring Road(mileage DK14+400~ DK15+050) with a structure span of about 40m in the derection perpendicular to the tracks. Thearch was composed of oblique lines, arcs and parabola to meet the building height limit and landscape requirements.Prestressed balance cables was set in the parabolic section of the arch to balance the horizontal internal force in the localarch structure, which significantly improve the stress state of the main arch structure and the arch foot foundation.Prefabricated shell plates was applied in the thin concrete shells between the main arches. By optimizing the connectionjoint between the prefabricated shell plates and arch structure, the construction efficiency of project was improved whileensuring the reliability of the structural connection. During the design process, the envelope design was carried outaccording to multiple construction stages. The deformation of the main arch structure at each stage meets the requirementsof the specification. Overall stability analysis of the arch structure was carried out. Gravity concrete strip foundation withinclination angle was adopted in the arch foundation. Various unfavorable design conditions were fully considered in thefoundation design process to ensure the safety of the foundation design.

Keywords:Beijing ChaoYang Railway Station; enclosed sound barrier; large-span concrete arch shell; pre-stressed balancecable; prefabricated shell plate; construction analysis

第一作者:程卫红,博士,高级工程师,一级注册结构工程师,主要从事复杂结构设计咨询工作、组合结构及装配式结构研究,Email: chengweihong@ cabrtech. com.

[引用本文] 程卫红,张高明,刘枫,等. 大跨度混凝土拱壳声屏障结构设计研究[J]. 建筑结构,2023,53(12):49-54. CHENG Weihong,ZHANG Gaoming,LIU Feng,et al. Structural design and research of large-span concrete arch shellin enclosed sound barrier [J]. Building Structure,2023,53(12):49-54.