某工程钢螺旋楼梯结构重难点分析与设计  

Design and analysis on key and difficult points of spiral stair in a project

作　　者：陈德银 赖克 郑腾虎 CHEN Deyin;LAI Ke;ZHENG Tenghu(Sichuan Provincial Architectural Design and Research Institute Co.,Ltd.,Chengdu 610095,China)

机构地区：[1]四川省建筑设计研究院有限公司,成都610095

出　　处：《建筑结构》2023年第7期78-84,124,共8页Building Structure

摘　　要：以实际工程中的异形钢螺旋楼梯为研究对象,基于通用有限元软件MIDAS Gen,利用简化空间曲线模型分析了螺旋楼梯结构选型过程中楼梯的变形与内力变化,结果表明随着螺旋楼梯中心线最右侧边缘与上部支座的距离增大,楼梯的竖向最大位移与构件内力均增大。进一步通过建立带横梁的内、外弧梁曲线模型探讨了螺旋楼梯内、外弧梁变形的差异以及横梁的作用,并对楼梯支座条件对变形和内力的影响进行了分析,得到了支座刚度越大楼梯的变形越小的结论。对比了楼梯与主体结构共同建模和单独建模时的变形及内力差异,并对螺旋楼梯的舒适度进行了验算,建议在满足梁单元构件强度与稳定性的情况下优先选用箱形截面而非工字钢截面。针对分析结果给出了异形螺旋楼梯的设计要求并对梁截面进行了受扭验算。Taking special shaped steel spiral stair in actual engineering as the research object,based on the general finite element software MIDAS Gen,a simplified spatial curve model was used to analyze the deformation and internal force changes of spiral stair in the process of structural selection.The results show that the maximum vertical displacement and internal force of the stair increase with the increase of the distance from the rightmost edge of the center line to the top support.Further,by establishing the curve model of the inner and outer arc beams with cross beams,the difference of the deformation of the inner and outer arc beams of the spiral stair and the role of the cross beams were discussed.In addition,the influence of the stair support conditions on the deformation and internal force was analyzed,it obtains the conclusion that the greater the support stiffness is,the smaller the deformation of the stair is.The deformation and internal force difference between the stair and the main structure when modeling together and separately was compared.Besides,the comfort analysis of spiral stair was checked.It is suggested that the box section should be preferred to the I-section steel under the condition of meeting the strength and stability requirements of beam elements.Focus on the analysis results,the design requirements of special shaped spiral stair was given and beam section torsion checking calculation was given.

关 键 词：螺旋楼梯 有限元分析 空间梁单元模型 结构分析 舒适度分析 

分 类 号：TU392[建筑科学—结构工程]