新型叠合楼板的叠合面连锁咬合效应分析

Analysis of the Interlocking Effect of the Combined Interface in a New Type of Composite Floor

针对组合楼板的主要破坏模式——纵向剪切破坏,本文发现在一种新型叠合楼板中存在的连锁咬合效应,以之作为一种新的叠合面水平抗剪机制,并阐述了其作用机理.通过进行6块3类不同形式预制底板叠合成的叠合楼板的单向拟静力试验,从极限承载力、滞回曲线、自复位性能等方面总结、对比了这3种叠合板的整体受力性能,验证了这种水平抗剪机制的有效性.结果表明:相比于传统的叠合板,本文提出的这种新型叠合板中存在的连锁咬合效应减少了叠合面的损伤累积,可在一定程度上增强叠合板的变形恢复性能,提高此类叠合楼板叠合层与预制底板的协同受力性能,保证叠合试件充分发挥其极限承载能力.

To address the longitudinal shear capacity of composite slabs,this paper finds a kind of in-terlocking effect existing in a new type of composite slab, which is a new kind of shear mechanism and ex- pounds its mechanism. In order to verify the effectiveness of this type of shear mechanism, monodirection-al pseudo-static tests for six composite specimens with three kinds of structural forms of the precast panel were conducted. By comparing the integral behavior of the composite slab in ultimate load, hysteric curve, self-resetting property and so on, the results indicate that, when compared with ordinary prestressed con- crete composite slabs, owing to its less damage accumulation in the lamination of this new type of compos-ite slab, the proposed interlocking effect can enhance the deformation recovery performance to some extent and ensure that the composite slabs have good interaction between the laminated layer and the precast panel to give full play to its ultimate load.