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通过对4个足尺比例冷弯薄壁型钢-混凝土组合楼盖的受弯承载力进行单调静载试验研究,分析了压型钢板与冷弯薄壁型钢梁连接的螺钉间距和楼盖梁数量改变对组合楼盖极限承载力的影响及破坏机理。研究表明:在正常使用阶段,组合楼盖具有较高的承载力和较小的变形;减小螺钉间距和增加楼盖梁数量均能够提高组合楼盖的极限承载力。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、卷边及毗邻腹板出现相关屈曲破坏,屈曲波长为相邻螺钉间距;支座附近混凝土与压型钢板为脱离、掀起破坏;集中荷载作用点处楼盖梁为折曲破坏。采用考虑材料、几何和接触非线性ANSYS有限元程序对试验模型的受力性能进行了模拟,非线性有限元计算结果与试验结果吻合较好。在试验研究和有限元分析基础上,提出了组合楼盖的简化计算模型和理论计算方法。
Through the monotonic static load test on the flexural capacity of four full-scale cold-formed thin-walled steel-concrete composite floor panels, the screw spacing of the connection between the profiled steel plate and the cold-formed thin- Influence of Quantity Change on Ultimate Bearing Capacity of Composite Floor and Damage Mechanism. The research shows that the composite floor has higher bearing capacity and smaller deformation in normal use stage. Reducing the screw spacing and increasing the number of building beams can increase the ultimate bearing capacity of the composite floor. The failure modes mainly include bending buckling and buckling of the floor beam, buckling damage of the flange, curling and adjacent webs in the compression zone, and the buckling wavelength is the distance between adjacent screws. The concrete and the pressure plate near the bearing are detached , Set off damage; focus on the role of the load beam at the building Beam damage. The behavior of the test model was simulated by considering the material, geometry and contact nonlinear ANSYS finite element program. The results of the nonlinear finite element method agree well with the experimental results. On the basis of experimental research and finite element analysis, a simplified calculation model and theoretical calculation method of composite floor are proposed.