胶合竹-混凝土组合梁销栓连接性能试验研究

采用植筋螺杆作为连接件,对6组胶合竹-混凝土组合试件进行剪切滑移试验,测得了荷载-滑移曲线、抗剪承载力和抗滑移刚度等基本力学指标,并对不同组合方式进行了分析和比较.研究结果表明:组合试件的主要破坏模式为GluBam在螺杆局部挤胀作用下的纵向开裂和螺杆在胶合竹梁内部产生显著的弯折变形;组合试件的抗剪切性能随着螺杆直径的增大而增强,但提高效应呈递减趋势,选用直径为18mm的螺杆作为连接件较为合理;提高螺杆强度等级对改善组合试件的抗剪切刚度和组合梁的组合效应没有实质性作用;在组合界面设置防水层,对胶合竹梁含水率的影响是暂时的,可以取消.

Experimental Research on Dowelled Connection of GluBam-Concrete Composite Beams

This paper selected threaded rod as the shear connectors of glued bamboo beams. Single-sided shear tests on total 6 groups of shear-slip GluBam-Concrete composite specimens were performed. The major mechanical properties such as the load-slip curves, shear bearing capacity and anti-slip stiffness were measured and then evaluated. The test results indicate that the typical failure modes of composite blocks are the splitting of GluBam due to local compression caused by the connector, and obvious plastic deformation of rod occurs in the glued-in depth. The mechanical performance of the specimens is enhanced with the increasing diameter of dowel, while the improvement efficiency descends. The diameter of rod of 18 mm is a critical value for the shear-slip behavior, and it seems to be a reasonable choice. The quality grade of threaded rod has no substantive effect on the mechanical properties and composite action. Moreover, the action of the waterproof layer at the interface is temporary, and it can be removed for improving the composite effect.