钢-混凝土结构后锚固群锚节点抗剪性能试验研究

Experimental Study on the Shear Performance of Post-anchorage Group Anchor Nodes of Steel-concrete Structures

为研究钢-混凝土结构后锚固群锚节点的抗剪性能,设计并制作9个后锚固群锚节点试件,开展后锚固节点单调加载试验,并分析不同孔内清灰程度和锚栓直径对试件承载力和破坏模式的影响。研究结果表明,锚孔内灰尘对化学胶锚固黏结作用具有较大影响,孔内清灰程度越高,孔内灰尘量越少,试件承载力越大,外荷载做功越大。不同强度锚栓试件破坏现象不同,M10组试件锚栓多携带着化学胶被拉出孔外,发生胶体破坏,M14组试件锚栓因锚板下边缘处混凝土被压碎导致荷载-位移曲线陡降,多为边缘混凝土破坏,表现出良好的受剪性能。0%,50%清灰试件试验承载力均低于计算承载力,100%清灰试件试验承载力高于计算承载力,进行工程设计时需考虑因清灰程度不同导致的抗剪承载力折减。

In order to study the shear performance of post-anchored group anchor nodes of steel-concrete structures,nine post-anchored group anchor node specimens were designed and fabricated.Monotonic loading tests of the post-anchored nodes were carried out to analyze the effects of different degrees of dust removal in the hole and anchor bolt diameters on the bearing capacity and failure modes of the specimens.The research results show that the dust in the anchor hole has a great influence on the bonding effect of chemical glue.The higher the degree of dust removal in the hole,the lower the amount of dust in the hole,the higher the bearing capacity of the specimen,and the greater the work done by the external load.The failure phenomenon of different strength anchor bolts specimens is different,in which the anchor bolts of M10 group specimens are mostly carried with chemical glue being pulled out of the hole and colloidal damage occurs.The anchor bolts of M14 group specimens showed good shear performance due to a steep drop in the load-displacement curve caused by the crushing of the concrete at the lower edge of the anchor plate,mostly due to the damage of the concrete at the edge.The test bearing capacity of the specimens with 0%and 50%dust removal degree were lower than the calculated bearing capacity,while the test bearing capacity of the specimens with 100%dust removal degree was higher than the calculated bearing capacity.Therefore,it is necessary to consider the shear bearing capacity reduction due to the different degree of dust removal during the engineering design.