PBL传剪器极限承载力的试验研究

Experimental Investigation on Ultimate Load-Bearing Capacity of PBL Shear Connectors

为了考查PBL传剪器在拉-剪组合环境应力下的性能,设计了4组12个PBL传剪器试件,对其极限承载力和滑移量进行了试验研究.试验结果表明,PBL传剪器的极限承载力受孔中钢棒强度、混凝土轴心抗拉强度、钢板开孔直径、钢筋直径和环境应力类型等因素的影响.上述参数可以组合为无量纲外荷载与传剪器抗力,二者之间的关系可以用直线拟合,用于确定PBL传剪器的极限承载力.较之环境应力为拉应力,环境应力为压应力时,PBL传剪器的极限承载力绝对值大.

A test was carried out to investigate the characters of perfobond rib （PBL） shear connectors subjected to combined tension and shear background stresses. Twelve specimens of PBL shear connectors, sorted into 4 groups, were designed, and their ultimate load-bearing capacities and slipping behaviors were investigated experimentally. The experimental result shows that the ultimate load-bearing capacities of PBL shear connectors are influenced by the strength of steel, the tension strength of concrete, the diameter of holes in the steel slabs, the diameter of rebars and the type of background stress. The above-mentioned factors can be combined as the dimensionless load and dimensionless resistance of PBL shear connectors, and the relationship between the dimensionless load and the dimensionless resistance can be denoted by a linear equation. Such an equation can be fulfilled to determine the ultimate bearing capacity of PBL shear connectors. Furthermore, compared with a tension background stress, a compressive background stress can increase the load-bearing capacity of PBL shear connectors.