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The Non-Linear Finite Element Analysis of Cast-in-Place RC Hollow Flat Slab

机译：铸造型RC中空平板的非线性有限元分析

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Cast-in-Place RC hollow flat slab is a new type of slab which is formed by embedding thin wall pipes into a reinforced concrete flat slab. Nowadays, this kind of hollow flat slab has been listed as one of the important science and technology promotion projects of the Ministry of Construction. In this paper, based on the finite element analysis, the mechanical performance and deformation character of hollow fiat slab subjected to vertical uniformly distributed load are discussed. The crack load and the ultimate load are tested. The deformation, development and destroy modes of cracks are also described. The comparison between the hollow flat slab and solid slab with the same size and same load is done through the ANSYS non-linear finite element analysis. It can be realized that the bidirectional rigidity of the hollow flat slab is not greatly changed. The hollow flat slab is better than the solid slab because the hollow flat slab has many small ribs. In this paper the comparison between the hollow flat slab and the hollow slab with girders is also done. From the deflection picture, I can find that their mechanical routes are different.The former is through four points, and the latter is through four sides. The ultimate load of the hollow slab with girders is bigger than that of the hollow flat slab. So the girders are of advantage to the hollow slab. Changing the distance of tube end, the hidden girder width and the diameter of tube, I can find that the distance of tube end should be 1/6 of the tube length and should not be less than 80mm. The clearance width should not be less than 50mm, and the hidden girder width should be between 1/13～1/16 of the width of span and not be less than 400mm. Some suggestions are advanced.
机译：铸造型RC中空平板是一种新型板坯，通过将薄壁管嵌入钢筋混凝土平板中而形成。如今，这种空心平板已被列为建设部的重要科学和技术促进项目之一。本文讨论了基于有限元分析，讨论了经受垂直均匀分布式载荷的中空菲亚特板坯的机械性能和变形特征。测试裂缝负荷和最终负载。还描述了裂缝的变形，开发和破坏模式。通过ANSYS非线性有限元分析完成中空平板和具有相同尺寸和相同载荷的固体板之间的比较。可以意识到中空平板的双向刚度不会大大改变。中空平板比固体板更好，因为中空平板有许多小肋骨。在本文中，中空平板与带梁的空心板之间的比较也进行了。从偏转图片中，我可以发现他们的机械路线是不同的。前者是通过四个点，后者是四边。空心板具有梁的最终负载大于中空平板的大。因此，梁对空心板有利。改变管端的距离，隐藏的梁宽和管的直径，我可以发现管端的距离应为管长度的1/6，不应小于80mm。间隙宽度不应小于50mm，隐藏的梁宽应在宽度宽度的1/13〜1/16之间，而不是小于400mm。一些建议是先进的。

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