冷弯薄壁型钢混凝土组合楼盖振动性能试验研究VIP专享

冷弯薄壁型钢-混凝土组合楼盖振动性能试验讨论贾子文1周绪红1，2( 1．长安大学，陕西西安 710061; 2． 兰州大学，甘肃兰州 730000)摘要: 对构造不同的四块足尺比例冷弯薄壁型钢-混凝土组合楼盖模型进行振动性能的动载试验。在正常使用阶段，讨论压型钢板与冷弯薄壁型钢梁连接的螺钉间距、刚性支撑件、楼盖端部约束条件等构造设置和楼面活荷载对 组合楼盖自振频率的影响。讨论表明: 组合楼盖的自振频率随楼面活荷载的增加而降低; 减小压型钢板与冷弯薄 壁型钢梁连接的螺钉间距、相邻楼盖梁的跨中位置设置刚性支撑件及加强楼盖端部约束均能提高组合楼盖的自振 频率。采纳 ANSYS 有限元程序对试验模型 24 种荷载工况的振动性能进行模态分析，有限元模态自振频率与试验 自振频率吻合较好。提出的理论公式能够较好预测组合楼盖的自振频率。在正常使用阶段荷载标准组合下，建议 组合楼盖的自振频率不小于 10Hz。关键词: 组合楼盖; 冷弯薄壁型钢梁; 自振频率; 试验讨论; 有限元模态分析; 理论公式中图分类号: TU398 + ．9文献标识码: A文章编号: 1000-131X( 2024) 04-0042-10Experimental study of vibration behavior of cold-formed steelconcrete composite floorJia Ziwen1 Zhou Xuhong1，2( 1． Chang’an University，Xi’an 710061，China; 2． Lanzhou University，Lanzhou 730000，China)Abstract: Four full scale cold-formed steel composite floors with different patterns of configuration were dynamically tested to study the vibration behavior． In the service stage，when the space between screws connect the profiled steel sheet and the cold-formed steel joists were changed，or the rigid blocking，end constraints，floor live load were different， effects to the fundamental frequency of composite floor were studied． The study shows that the fundamental frequency declines with the increase of the floor live load，and the fundamental frequency can be improved by reducing the space between screws，setting rigid blockings at mid-span of adjacent joists，or strengthening the floor end constraints． Through modal analys...