新型装配整体式楼盖的板缝抗剪性能研究

根据3个装配式楼盖板缝试件的抗剪静力加载试验,分析不同板缝连接的破坏形态、新型连接的齿槽及三角筋抗剪作用,并建立新型连接的抗剪力学模型,给出齿槽加三角筋连接的抗剪承载力公式。研究结果表明:齿槽的板缝连接承载力最高,但破坏形态为脆性的剪切破坏;三角筋试件承载力也较高且延性较好,在破坏之前有较大的滑移;新型连接的抗剪力为三角筋的抗拔力和齿槽混凝土的抗压力,斜向三角筋受到较大的拉应力并且对齿槽施加正应力,提高齿槽混凝土抗剪切能力。

Study On the Connection Shear Behavior of the New Prefabricated Floor

According to the shear static test of three prefabricated slab specimens, The failure process of the connection is analyzed. The shear effect of alveolar and diagonal rib of new connections were studied and establish new connections shear mechanical model, and shear capacity formula of the new connection was given. The results showed that: Alveolar slab connection carrying capacity is the highest, but its damage morphology is a brittle shear failure.Diagonal rib has higher Carrying Capacity and better ductility, and the destruction specimens have greater slippage. Shear force of new connector comprises the diagonal rib pullout and the resistance to pressure force of alveolar. The normal stress is applied to alveolar when the diagonal rib subject to greater tensile stress and this improve shear capacity of alveolar.