摘要
为研究冷弯薄壁型钢组合楼盖的面内刚度和承载能力,采用ABAQUS软件建立楼盖有限元模型,通过轻钢楼盖面内滞回试验结果进行验证.研究不同参数对楼盖模型面内刚度和承载力的影响规律,结果表明:改变楼盖梁尺寸、楼盖梁腹板开孔面积和间距以及扁钢带和刚性支撑件的布置方式对楼盖面内刚度和承载力影响较小,减小自攻螺钉连接间距和组合楼盖的长宽比能提高组合楼盖的面内刚度和承载力,在20~40mm范围内改变楼板厚度对组合楼盖面内刚度和承载力存在一定影响.基于组合楼盖的破坏模式和受力机理,楼盖的面内极限承载力可通过单颗自攻螺钉连接的承载力和楼盖两侧自攻螺钉连接的数量进行估算.基于退化四折线模型,建立组合楼盖面内刚度的计算方法,为轻钢楼盖的工程设计与应用提供理论依据.
In order to investigate the in-plane stiffness and bearing capacity of cold-formed thin-walled steel composite floor,a floor model was established through ABAQUS software and verified by the in-plane cyclic loading test results. Further,the effect of different parameters on the in-plane stiffness and bearing capacity of the floor model was studied. The results showed that the influence of the joist size,the opening area and spacing of joist web,flat strap and blocking layout on the in-plane stiffness and bearing capacity of composite floors was insignificant. The in-plane stiffness and bearing capacity of composite floors can be improved by decreasing the screw spacing and the length-to-width ratio of floor. The change of slab thickness in the range of 20~40 mm had a certain effect on the in-plane stiffness and bearing capacity of composite floors. Based on the failure modes and mechanical behavior of composite floors,the ultimate bearing capacity of floor can be estimated by the load-carrying capacity of the single self-tapping screw and the number of self-tapping screws connected on both sides of floor. The calculation method for in-plane stiffness of composite floors was established based on the degenerate quadri-polyline model,which provided a theoretical basis for engineering design and application of thin-walled steel floors.
作者
管宇
周绪红
石宇
姚欣梅
GUAN Yu;ZHOU Xuhong;SHI Yu;YAO Xinmei(School of Civil Engineering,Chang'an University,Xi'an 710061,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第9期31-43,共13页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划资助项目（2016YFC0701201）,
国家自然科学基金资助项目（51908047）
陕西省自然科学基础研究计划资助项目（2018JQ5037）
中央高校基本科研业务费专项资金资助项目（300102289112）~~
关键词
冷弯薄壁型钢
楼盖
刚度和承载力
计算方法
刚性楼盖
cold-formed thin-walled steel
floors
stiffness and load-carrying capacity
calculation method
rigid floor
