冷弯成型方钢管-泡沫混凝土组合双向板力学性能试验模拟对比研究  

MECHANICAL PERFORMANCE TESTS AND NUMERICAL SIMULATIONS OF COMPOSITE CONCRETE TWO-WAY SLABS REINFORCED WITH COLD-FORMED THIN-WALL SQUARE STEEL TUBES

作　　者：刘殿忠[1] 李红现 杨凯[1] LIU Dianzhong;LI Hongxian;YANG Kai(College of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118

出　　处：《工业建筑》2020年第10期170-179,198,共11页Industrial Construction

摘　　要：对密度均为1600 kg/m 3的泡沫混凝土SXB-1、SXB-2、SXB-3三个组合双向板试件进行加载试验和模拟对比研究,通过试验得到了三个组合双向板试件的破坏现象和对组合板上的冷成型方钢管和泡沫混凝土的荷载-应变曲线,探究冷弯成型方钢管-泡沫混凝土组合双向板的双向受力性能,以等间距加筋型钢间距为变量,进一步分析了对冷弯成型方钢管-泡沫混凝土组合双向板的承载性能影响。有限元模拟通过以型钢壁厚、型钢强度、型钢间距为控制变量,来综合分析对冷弯成型方钢管-泡沫混凝土组合双向板的力学性能影响。试验和模拟结果表明:冷弯成型方钢管-泡沫混凝土组合双向板在型钢加筋方向均具有良好的承载性能和受力状态,且最终破坏时的板底裂缝扩展,均呈现出相互交错的蝶形或者X形分布;型钢间距越小,组合双向板的刚度与承载能力就会越高,挠度与应变增长就会越小;随着型钢壁厚的增加、型钢强度的提高、型钢间距的减小,不仅提高了型钢骨架自身的强度、刚度,还增加了冷弯成型方钢管-泡沫混凝土组合双向板的整体承载性能。In the paper,the three composite concrete two-way slabs of SXB-1,SXB-2,and SXB-3 reinforced with cold-formed thin-wall square steel tubes and with a density of 1600 kg/m 3 of foam concrete were tested and compared by FEM simulations.The failure phenomena of the three composite two-way slabs and the mechanical performance of the composite concrete two-way slabs were got.Influence of different spacings of tubes on the baring capatity performances of composite concrete two-way slabs was analyzed.Taking as the wall thickness of the section steel tubes,the strength of the section steel,and the spacing of the section steel as control variables,the effect on the mechanical properties of the composite concrete two-way slab was studied.The results showed that:the composite concrete slabs had good bearing performances in the X and Y directions,and the cracks at the bottom of the slabs at the time of failure eventually showed intersecting butterfly shape or X-shape development;the smaller the section spacing,the higher the stiffness and bearing capacity of the composite concrete slabs,the smaller the deflection and strain;as the section wall thickness increased,the steel material strength increased,the grid sizes decreased,the strength and rigidity of the steel frame itself,increased and the same as the the composite concrete two-way slabs.

关 键 词：组合双向板 承载能力 刚度 挠度 应变 

分 类 号：TU398.9[建筑科学—结构工程]