【摘要】 目的分析竖向均布荷载作用下的现浇钢筋混凝土空心无梁楼盖的受力性能,计算其开裂荷载和极限荷载.方法应用ANSYS有限元软件对空心无梁楼盖进行了非线性有限元计算,分析了加载过程中的变形特征和裂缝形成、发展及在空心无梁楼盖上的分布规律.结果给出了空心无梁楼盖中点的荷载-挠度曲线图,开裂荷载为6.4 kPa,极限荷载为1 5kPa;空心无梁板的板厚宜为短跨长度的1/25~1/30,上下保护层厚度不小于50 mm;空心板管端净距宜为管长的1/6,不应小于80 mm;暗扁梁的宽度宜为板跨的1/13~1/16,且不小于400 mm;圆管直径可按构造设计,空心管管间净距不宜小于50 mm.结论现浇钢筋混凝土空心无梁楼盖具有整体性能好、跨度大、不突出梁、增加房屋净空、自重轻、节约材料、降低造价、简化施工、施工周期短等优点,是一种新型楼盖.更多还原

【Abstract】 Based on the elastic and plastic analysis,the crack load and ultimate load of cast-in-place RC hollow flat slab subjected to vertical uniformly distributed load are given.The deformation character and deflection distribution of the slab are analyzed.The deformation,development and destroy modes of cracks are also described.The load-deflection curve of the hollow flat slab’s midpoint is received,and the deflection changing law of the slab is presented.Changing the distance of tube end,the width of hidden girder and the diameter of tube,it can be found that the distance of tube end should be 1/6 of the tube length and not be less than 80mm,the clearance width should not be less than 50mm,and the width of hidden girder should be between 1/13～1/16 of the width of the span.Some suggestions are advanced.更多还原