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（北京市建筑設(shè)計(jì)研究院有限公司, 北京 100045）

［摘要］拱形結(jié)構(gòu)廣泛應(yīng)用于體育場(chǎng)館、航站樓等公共建筑，豎向荷載作用下拱形結(jié)構(gòu)在拱腳處會(huì)產(chǎn)生較大水平推力，如地質(zhì)條件較差或基礎(chǔ)處理不當(dāng)將產(chǎn)生較大變形，對(duì)主體結(jié)構(gòu)受力和變形會(huì)產(chǎn)生一定的影響。以贊比亞體育場(chǎng)結(jié)構(gòu)為例，采用巖土分析軟件PLAXIS對(duì)拱腳和墩基礎(chǔ)進(jìn)行了有限元分析，對(duì)墩基礎(chǔ)抗推方向土體未處理和水泥壓力注漿樹根樁加固處理的拱腳變形進(jìn)行了對(duì)比分析；然后將基礎(chǔ)變形計(jì)算結(jié)果作為強(qiáng)制位移輸入到MIDAS/Gen建立的整體模型中，分析了大跨度拱形結(jié)構(gòu)拱腳變形對(duì)主體結(jié)構(gòu)受力和變形的影響，相關(guān)做法可為工程設(shè)計(jì)人員在設(shè)計(jì)此類項(xiàng)目時(shí)提供參考。

［關(guān)鍵詞］大跨度空間結(jié)構(gòu)； 拱形結(jié)構(gòu)； 拱腳變形； 強(qiáng)迫位移； 體育場(chǎng)

中圖分類號(hào)：TU393-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

作者簡(jiǎn)介：龍亦兵，學(xué)士，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：yibing_long@126.com。