The two ways stiffness ratio of the reinforced concrete hollow slab is studied and the results show the reinforced concrete hollow slab is bent in two ways under the vertical loads providing the length of the two rims of the slab are near . the analysis for the concealed wide - flat beams demonstrates that it belongs to the column strip and it does not possess the function of the frame girder 本文首先从理论上分析了空心板两方向刚度比，认为两边长接近的空心板在竖向荷载作用下为双向受弯，其受力性能为双向板；分析了柱上暗扁梁在楼盖中的作用，认为它不能起到框架梁的作用，应为柱上板带的一部分。
