钢-GPC栓钉连接界面抗剪性能

Study on shear performance of steel-GPC interfaces with studs

为探究钢-地质聚合物混凝土(geopolymer concrete,GPC)栓钉连接的界面抗剪性能,对4组栓钉连接的钢-混凝土试件进行推出试验,分析其破坏模式、荷载-滑移曲线、抗剪承载力以及延性等力学性能,得到混凝土类型、GPC抗压强度以及栓钉直径对界面黏结性能的影响规律。结果表明:GPC试件中栓钉表现出剪断破坏,与普通混凝土试件破坏形态一致,GPC翼板无明显裂缝,整体性较好;GPC栓钉抗剪承载力与普通混凝土栓钉试件相近,刚度偏低,但具有更好的延性;提高GPC抗压强度和栓钉直径可有效提高栓钉的抗剪承载力和刚度。基于实测结果,提出栓钉连接的钢-GPC抗剪承载力计算公式和界面黏结-滑移本构模型。

To study the shear performance of steel-geopolymer concrete(GPC)interfaces with studs,four groups of push-out tests were carried out.The mechanical properties including damage mode,load-slip curve,shear capacity and ductility were analyzed to obtain the effects of concrete type,compressive strength of GPC and diameter of stud on the shear performance.The test results show that the specimen studs in GPC exhibit shear damage,which is consistent with the specimens of studs in ordinary concrete;the shear bearing capacity of studs in GPC is similar to that of studs in ordinary concrete,and the shear stiffness is low,but the ductility is good;increasing the compressive strength and diameter of studs embedded in GPC can effectively improve the shear bearing capacity and stiffness of studs.Finally,based on the measured results,the shear bearing capacity calculation formula and bond-slip principal structure model of steel-GPC connected by studs are proposed.