楼板刚度对钢柱稳定性影响的研究  

THE RESEARCH ON THE INFLUENCE OF FLOOR STIFFNESS FOR THE STABILITY OF STEEL COLUMNS

作　　者：杨伦 YANG Lun(Xinjiang Architectural Design Institute Co.,Ltd.,Urumqi 835000,China)

机构地区：[1]新疆建筑设计研究院股份有限公司,乌鲁木齐835000

出　　处：《低温建筑技术》2024年第7期130-133,共4页Low Temperature Architecture Technology

摘　　要：为考察楼板面外刚度对钢柱稳定承载力的影响,以某钢框架住宅结构局部模型为研究对象,采用ANSYS有限元软件,精细化模拟钢梁、钢柱、栓钉及楼板,建立其有限元模型,提取楼板对柱顶等效线约束刚度,确定楼板相应约束效应的等效宽度。在此基础上考虑结构整体缺陷、构件局部缺陷、材料及几何非线性等因素的影响,采用弧长法得到钢柱的弹塑性稳定极限承载力。考察楼板平面外弯曲刚度对钢柱稳定极限承载力的影响,分析楼板等效刚度及钢柱稳定系数随楼板厚度的变化规律。结果表明楼板平面外刚度对钢柱的转动约束效应显著,且约束效果随楼板厚度的增加而逐渐增大,可为钢框架住宅钢柱的设计提供参考。The local model of a steel frame residential structure is taken to investigate the influence of floor surface stiffness on the stability bearing capacity of steel columns,in which the finite element software ANSYS is used to simulate the steel beam,steel column,bolts,and floors.The equivalent constraint stiffness of the floor to the column top is extracted,and the equivalent width of the corresponding constraint effect of the floor is determined.The elas⁃tic-plastic ultimate bearing capacity of the steel column is obtained by arc length method considering the influence of the whole structure defect,the local defect of the member,the material,and the geometric nonlinearity.The effec⁃tiveness of the flexural stiffness of the floor on the ultimate bearing capacity of the steel column is investigated,and the variation of the equivalent stiffness of the floor and the stability coefficient of the steel column with the thickness of the floor is analyzed.The results show that the lateral stiffness of the floor has a significant effect on the rotation constraint of the steel column,and the constraint effect gradually increases with the increase of the floor thickness,providing the reference for the design of steel frame residential steel column.

关 键 词：楼板刚度 非线性 弹塑性稳定承载力 稳定系数 

分 类 号：TU391[建筑科学—结构工程]