（北京市建筑设计研究院有限公司, 北京 100045）

［摘要］拱形结构广泛应用于体育场馆、航站楼等公共建筑，竖向荷载作用下拱形结构在拱脚处会产生较大水平推力，如地质条件较差或基础处理不当将产生较大变形，对主体结构受力和变形会产生一定的影响。以赞比亚体育场结构为例，采用岩土分析软件PLAXIS对拱脚和墩基础进行了有限元分析，对墩基础抗推方向土体未处理和水泥压力注浆树根桩加固处理的拱脚变形进行了对比分析；然后将基础变形计算结果作为强制位移输入到MIDAS/Gen建立的整体模型中，分析了大跨度拱形结构拱脚变形对主体结构受力和变形的影响，相关做法可为工程设计人员在设计此类项目时提供参考。

［关键词］大跨度空间结构； 拱形结构； 拱脚变形； 强迫位移； 体育场

中图分类号：TU393-3文献标识码：A文章编号：1002-848X(2018)20-0116-04

Design and analysis of arch foot deformation and its influence on arched large-span structure

Long Yibing

(Beijing Institute of Architectural Design, Beijing 100045, China)

Abstract:Arched structures are widely used in public buildings such as stadiums and terminal buildings. Under vertical load, it will produce large horizontal force at arch foot of the arched structures. If the geological conditions are poor or the basic treatment is improper, large deformation will occur, which will have a certain impact on the stress and deformation of the main structure. Taking the Zambian Stadium structure as an example, the finite element analyses of the arch and pier foundation were carried out by using the geotechnical analysis software PLAXIS. The comparative analyses were carried out on the deformation of the arch of the two conditions. First condition is that there is untreated soil in the anti-pushing direction of the pier foundation; the second condition is that cement pressure grouting tree-root-pile reinforcement treatment is conducted. Then the calculation results of the basic deformation were input into the overall model established by MIDAS/Gen. The influence of the deformation of the arch of the large-span arched structure on the stress and deformation of the main structure was analyzed. The related practice can provide a reference for engineering design personnel when designing such projects.

Keywords:large-span spatial structure; arched structure; arch foot deformation; forced displacement; stadium

作者简介：龙亦兵，学士，高级工程师，一级注册结构工程师，Email：yibing_long@126.com。