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（1 北京建筑大學(xué)土木與交通工程學(xué)院， 北京 100044； 2 北京市建筑設(shè)計(jì)研究院有限公司，北京 100045； 3 中國建筑第二工程局有限公司， 北京 100160）
［摘要］為提升某圖書館大堂三跑螺旋樓梯的外觀效果，提出外側(cè)矩形截面曲梁設(shè)置吊桿的結(jié)構(gòu)布置方案。通過Rhinoceros精確建模，一次性完成細(xì)部節(jié)點(diǎn)設(shè)計(jì)。采用有限元軟件MIDAS Gen分析了結(jié)構(gòu)內(nèi)力和變形，并進(jìn)行構(gòu)件截面設(shè)計(jì)。通過整體模態(tài)分析和實(shí)際工況時(shí)程分析，對結(jié)構(gòu)舒適度進(jìn)行了評價(jià)。最后模擬了施工方案，比較了理論計(jì)算與安裝過程造成的偏差。結(jié)果表明：節(jié)點(diǎn)細(xì)部需仔細(xì)推敲；螺旋樓梯內(nèi)、外側(cè)變形差異較大，休息平臺和踏步起到了協(xié)調(diào)傳力的作用，適當(dāng)加強(qiáng)應(yīng)力集中部位有利于改善構(gòu)件的內(nèi)力和變形；重點(diǎn)關(guān)注了支座附近受力狀態(tài)和中段變形大??；舒適度評價(jià)時(shí)宜按實(shí)際工況進(jìn)行時(shí)程分析；懸掛構(gòu)件自上而下安裝時(shí)，建議提供各階段桿件內(nèi)力，以便施工調(diào)平。
［關(guān)鍵詞］懸掛樓梯； 螺旋樓梯； 舒適度評價(jià)； 施工模擬
中圖分類號：TU318+.2文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)14-0062-06
Structural analysis and design of peripheral suspended steel spiral stairs
XI Qi1,2, WANG Xu3, BAI Shuang2
（1 School of Civil and Transportation Engineering， Beijing University of Civil Engineering and Architecture， Beijing 100044， China； 2 Beijing Institute of Architectural Design， Beijing 100045， China；3 China Construction Second Engineering Bureau Co., Ltd.， Beijing 100160， China）
Abstract:In order to improve the appearance effect of the three-run spiral stairs in the lobby of a library, the structural designer put forward the structural layout scheme of the outer rectangular cross-section curved beams with suspenders. Through the precise modeling with Rhinoceros software, the detailed node design was completed at one time. The finite element software MIDAS Gen was used to analyze the internal force and deformation of the structure and the sections of the component were designed. Through the whole modal analysis and the actual time-history analysis, the structural comfort appraisal was carried out. Finally, the construction scheme was simulated and the deviation between the theoretical calculation and the installation process was compared. Analysis results show five viewpoints: the details of the nodes need careful deliberation; the deformation difference between the inside and outside of the spiral stairs is large, the rest platform and the step play a role in coordinating the transmission of force, and properly strengthening the stress concentration location is beneficial to improve the internal force and deformation of the component; the stress state near the support and the size of the middle section deformation are focused on; the time history analysis should be carried out according to the actual working conditions when evaluating the comfort; it is recommended to provide the internal force of the rods at various stages to facilitate construction leveling.
Keywords:suspended stairs; spiral stairs; comfort appraisal; construction simulation
作者簡介：奚琦，學(xué)士，工程師，Email:xiqi@biad.com.cn。
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