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提出一种新型的预应力空心楼盖,即在新型预应力空心板的两正交方向配置预应力受拉钢筋,在预应力空心板两侧设置凹槽和伸出预应力受拉钢筋与边梁连接,板端浇缝处伸出U形筋与预应力受拉钢筋连接,且在板端孔内设置堵头,与后浇缝混凝土形成一体。采取单向低周反复加载进行推出试验,主要研究带拼缝新型预应力空心楼盖的抗剪性能。试验结果表明:新型预应力空心楼盖的U形筋试件整体连接较好,具有较好的延性及较高的抗剪承载能力。对于凹槽试件,通过对凹槽尺寸的合理设计及适当的钢筋配置,能够保证试件达到破坏时具有较大的抗剪承载能力的目的。因此该新型预应力空心楼盖的抗剪承载力能够得到保证,其可在工程中加以应用。
A new type of prestressed hollow floor is proposed, that is, prestressed tensile bars are arranged in two orthogonal directions of the new prestressed hollow slab, grooves are provided on both sides of the prestressed hollow slab and extensional prestressed tensile bars and side beams Connection, the U-shaped bar protruding from the board end pouring seam is connected with the prestressed reinforced bar, and a plug is arranged in the end hole of the plate and is integrated with the concrete after pouring. Take one-way low cycle repeated loading for launch test, the main research with a new patch of prestressed hollow floor shear performance. The test results show that the U-shaped bars of the new type of prestressed hollow floor cover have a better overall connection, better ductility and higher shear capacity. For the grooved specimen, through the reasonable design of the groove size and the proper reinforcement arrangement, the specimen can be guaranteed to have a greater shear bearing capacity when it is damaged. Therefore, the shear strength of the new prestressed hollow floor can be guaranteed, which can be applied in engineering.