(启迪设计集团股份有限公司, 苏州 215021)

摘要: 本工程屋顶层东侧整层挑出,悬挑长度 16. 80m,并在悬挑端南北向封闭形成 U 形悬空办公空间. 悬挑结构采用钢桁架方案,并通过多方案比选确定满足建筑要求、结构安全及经济合理的桁架形式. 详细介绍了悬挑结构承载力、变形、抗连续倒塌、楼盖舒适度、楼板应力及复杂节点等专项分析. 结果表明:悬挑桁架向主体结构内部延伸一跨、支撑桁架的框架柱内设置型钢、悬挑桁架做成刚接节点等措施可有效保证结构承载力、变形及抗倒塌能力,通过调整楼板厚度和配筋及控制合理的施工顺序可以有效减小桁架变形造成的楼板拉压内力.

关键词: U 形悬挑结构; 钢桁架; 竖向地震; 抗连续倒塌; 舒适度; 楼板应力

中图分类号:TU355 文献标志码:A 文章编号:1002⁃848X(2022)07⁃0051⁃09

DOI:10. 19701 / j.jzjg.SZY2132

Design and analysis of a U⁃shaped cantilever structure

CAO Yankai, YUAN Xuefen, GUO Jun, LIN Shan

(Tus⁃Design Group Co., Ltd., Suzhou 215021,China)

Abstract: The entire east side of the roof layer of this project is protruded out, the cantilever length is 16. 80m, and thecantilever end is closed in the north⁃south direction to form a U⁃shaped suspended office space. The cantilever structureadopts the steel truss scheme, and through the comparison of multiple schemes, the truss form that meets the architecturalrequirements, structural safety and economical rationality was determined. The special analysis of the bearing capacity,deformation, collapse prevention, floor comfort, floor stress and complex joints of the cantilevered structure was introducedin detail. The results show that measures such as extending the cantilever truss to the interior of the main structure for onespan, setting the section steel in the frame column supporting the truss, and making the cantilever truss into rigid joints,can effectively ensure the bearing capacity, deformation and anti⁃collapse ability of the structure. By adjusting the thicknessand reinforcement of the floor and controlling the reasonable construction sequence can effectively reduce the tensile andcompressive internal force of the floor caused by the deformation of the truss.

Keywords:U⁃shaped cantilever structure; steel truss; vertical earthquake; anti⁃continuous collapse; comfort; floor stress

第一作者:曹彦凯,学士,高级工程师,一级注册结构工程师,主要从事大型综合体、大跨结构、复杂高层等结构设计研究,Email: yankai.cao@ siad⁃c.com.

[引用本文] 曹彦凯,袁雪芬,郭军,等. 某 U 形悬挑结构设计与分析[ J]. 建筑结构,2022,52(7):51⁃59. CAOYankai,YUAN Xuefen,GUO Jun,et al. Design and analysis of a U⁃shaped cantilever structure[ J]. Building Structure,2022,52(7):51⁃59.