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（華南理工大學(xué)建筑設(shè)計(jì)研究院有限公司， 廣州 510641）

［摘要］某綜合性辦公樓地下2層，地上塔樓20層，裙樓5層。裙樓4層局部懸挑達(dá)20～25m。結(jié)合建筑造型和功能，利用4層整層空間，設(shè)置4-5m高的鋼桁架，作為主懸挑構(gòu)件。在懸挑桁架根部采用了交叉腹桿桁架，提高了桁架剛度與承載力。針對(duì)大懸挑桁架制定了具體的施工方案，對(duì)桁架在各施工階段的撓度進(jìn)行了監(jiān)測，并與有限元分析結(jié)果進(jìn)行對(duì)比。結(jié)果顯示，懸挑桁架撓度實(shí)測值與計(jì)算值整體上吻合較好。

［關(guān)鍵詞］鋼桁架； 大懸挑結(jié)構(gòu)； 施工； 撓度

中圖分類號(hào)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)20-0086-04

Discussion of key design and construction technologies of a large cantilevered steel structure

Shen Xuelong, Guo Yuanxiang

（Architectural Design & Research Institute of SCUT Co., Ltd., Guangzhou 510641, China）

Abstract:A comprehensive office building has 2 floors underground, 20 floors above ground and 5 floors of skirt building. The fourth floor of the skirt building is partially cantilevered up to 20~25m. Combined with the building shape and function, the steel truss with 4-5m height was set up as the main cantilevered component by using the whole floor space of the fourth floor. The cross web truss was used at the root of the cantilevered truss, which improves the stiffness and bearing capacity of the truss. Specific construction schemes were formulated for large cantilevered truss, and the deflection of the truss in various construction stages was monitored and compared with the results of finite element analysis. The results show that the measured and calculated deflections of the cantilevered truss are in good agreement.

Keywords:steel truss; large cantilevered structure; construction; deflection

作者簡介：沈雪龍，碩士，工程師，Email：250171833@qq.com。