整体装配式预应力板柱节点摩擦性能的试验研究

Experimental Study on Friction Performance of Integral Prefabricated Prestressed Slab-column Joints

通过对6个整体装配式预应力板柱结构节点试件的试验研究,分析了板柱节点灌缝的胶结材料(如细石混凝土)强度、预应力大小、外加剂等因素对板柱节点界面摩擦性能的影响,并对比了板柱节点处存在细石混凝土胶结材料与否时的差异.试验结果表明:板柱节点处灌缝细石混凝土会显著提高节点摩擦性能,与不灌缝的节点试件相比,摩擦性能提高幅度在35%以上.细石混凝土的强度、施加预应力大小、外加剂种类也会不同程度影响节点的摩擦性能.当细石混凝土立方体抗压强度由30 MPa增加到40 MPa时,界面摩擦性能提高约9.8%.预应力从300kN增大到450kN时,节点界面摩擦性能提高约55.1%,膨胀剂添加后对节点界面摩擦性能也有提高作用,但是幅度很小.

The influences of cement based material （such as fine aggregate concrete） strength,prestressing,additive admixture and other factors on the friction performances of the integral prefabricated prestressed slab column joint structures were analyzed through experimental study on 6 joints. The difference between the slab column joints with and without fine stone concrete cement material was also compared. The results show that fine stone concrete at the slab column joints can significantly improve the friction performance. The friction performance was increased by more than 35% when compared with that of the joint specimen without filling materials. Cement material strength,prestress and additive admixture can affect the friction performance of the node to various degrees. When the cubic strength of the fine aggregate concrete increased from 30 MPa to 40 MPa,the friction performance at the joint interface increased by about 9.8%. When the prestress increased from 300 kN to 450 kN,the friction performance of the joint interface increased by around 55.1%. The expansion agent can also improve the friction performance of the joint interface,but the effects are just a little.