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通过对两边简支不同螺钉间距的两块足尺单跨冷弯薄壁型钢梁-定向刨花板(OSB板)组合楼盖的承载力进行单调静载试验,分析OSB板与冷弯薄壁型钢梁连接的螺钉间距对组合楼盖最大承载力的影响及试件的破坏机理。试验表明:冷弯薄壁型钢梁-OSB板组合楼盖具有较高的承载力和较小的变形;减小螺钉间距可以提高组合楼盖的承载力。试件的破坏模式主要表现为楼盖梁发生弯扭屈曲的同时,受压区翼缘、卷边及腹板出现相关屈曲破坏,屈曲波长为相邻螺钉间距;支座附近OSB板与冷弯薄壁型钢梁脱离、掀起破坏。采用考虑材料、几何和接触非线性的ANSYS有限元程序对试件进行模拟,非线性有限元计算结果与试验结果吻合较好。在此基础上,对螺钉间距、楼面板厚度、楼盖梁间距、楼盖梁截面厚度以及钢材强度等影响因素进行参数分析,结果表明:减小螺钉间距和楼盖梁间距、增大楼面板和楼盖梁截面厚度、提高钢材的强度均可以提高组合楼盖的承载力。
By carrying out monotonic static load test on the bearing capacity of two composite single-span single-span cold-formed steel beam-oriented strand board (OSB) composite decks with different screw spacing on both sides, the effects of OSB plate and cold bending thin wall The influence of the screw spacing of the steel beam on the maximum bearing capacity of composite floor and the failure mechanism of the specimen. The test results show that cold-formed thin-walled steel beam-OSB composite floor has higher bearing capacity and smaller deformation; reducing the screw spacing can improve the bearing capacity of composite floor. The failure modes of the specimens mainly include flexural buckling and buckling of the floor beam, buckling damage of flanges, curling and webs in the compression zone, and the buckling wavelength is the distance between adjacent screws. Thin-walled steel beams off, set off damage. The ANSYS finite element program considering the material, geometry and contact nonlinearity was used to simulate the specimen. The results of the nonlinear finite element method agree well with the experimental results. On this basis, the parameters of screw spacing, floor slab thickness, floor beam spacing, floor cross-section thickness and steel strength were analyzed. The results show that: to reduce the screw spacing and floor beam spacing, increase the floor and Floor beam cross-section thickness, increase the strength of steel can improve the combined floor of the bearing capacity.