木-混凝土连接性能试验研究

Test Research on Performance of Wood-Concrete Connection

目的研究木与混凝土间粘结作用,为木-混凝土组合结构的研究奠定前期基础.方法根据设置于木材表面抗剪连接件的形式及抗剪连接件数量的不同设计制作了三组共计九根木与混凝土间抗剪连接件试件和一根无抗剪连接件的对比试件,采用推出试验方法对木材进行加载直至木与混凝土间发生滑移破坏.结果通过推出试验获得了木-混凝土推出荷载的大小、木材在混凝土中滑移量、木材表面抗剪连接件荷载作用下其应力变化等相关实验数据.结论抗剪连接件的存在能够明显抑制木材与混凝土间受力过程中的相对滑移,相对滑移量的减少与抗剪连接件数量成正比,同时也与抗剪连接件形式有关;加载过程中抗剪连接件所受应力与抗剪连接件形式有关,同时也与抗剪连接件距加载点距离有关;研究也表明:抗剪连接件的存在对木与混凝土间粘结力的提高无明显影响.

In order to lay a preliminary foundation for research of wood-concrete composite structures,this paper studied the bond forces between wood and concrete. Three groups with total of 9 specimens of shear wood-concrete connectors and a contrastive specimen without shear connector were designed and tested. Using the push-out test method, experimental data such as the loading value （push-out load） that leads to the slip failure between wood and concrete,the wood slippage and stress changes of shear connector on the wood surface were obtained. Results show that the shear connector can significantly inhibit the relative sliding between wood and concrete;decrease of the relative slippage value is proportional to the number of shear connectors. It is also related to the form of the shear connector. During the loading process, the stresses of the shear connector are influenced by its form and the distance from loading point to the shear connector. However, the shear connector has not obvious effects on increasing the bond force between wood and concrete.