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针对传统现浇混凝土空心楼盖存在的模壳刚度小、制作成本高、回收利用率低、抗浮措施复杂等问题,提出一种后装式钢筋混凝土双向密肋空心楼盖。为了解该楼盖的竖向受力性能和破坏形态,进行了1块角点支承大比例试件的短期静力加载试验,分析了该楼盖在竖向荷载作用下的裂缝分布、破坏形态、挠曲变形、应变规律、竖向承载力以及后装式预制底板参与楼盖结构整体共同工作等特征。结果表明:该楼盖具有较高的竖向承载力、抗弯刚度和整体工作性能,后装式预制底板能够很好地参与楼盖结构整体共同工作,楼盖的挠曲变形及裂缝分布特征与双向密肋楼盖和实体平板楼盖相似。参考已有的角点支承双向楼盖变形的弹性理论计算方法,同时考虑试验楼盖的结构形式与加载方法,提出了两种考虑楼盖弹塑性阶段变形的简化计算方法,其计算结果与试验结果吻合良好。
In view of the problems of traditional cast-in-place concrete hollow floor, such as low rigidity of casing, high production cost, low recycling rate and complex anti-floating measures, a kind of rear-mounted reinforced concrete two-way dense rib hollow floor is proposed. In order to understand the vertical bearing capacity and failure mode of the floor, a short-term static loading test was carried out on a large corner specimen supported by a corner, and the distribution of cracks and failure modes of the floor under vertical loading , Flexural deformation, strain law, vertical bearing capacity and the post-installed prefabricated floor to participate in the overall structure of the work together and other features. The results show that the floor has high vertical bearing capacity, flexural rigidity and overall workability. The rear-mounted prefabricated floor can well participate in the joint work of the floor structure, the deflection and the distribution of the floor cover Similar to two-way Mirrored floor and solid flat floor. With reference to the existing elastic theory calculation method for supporting two-way floor deformation at corner point, and taking into account the structure and loading method of the test floor, two simplified calculation methods for considering the deformation of the floor during the elastoplastic phase are proposed. The calculation results and tests The result is in good agreement.