不同材料胶结层对组合梁粘结性能影响的试验研究

Experimental study on the effect of cemented layer of different materials on the bond performance of composite beams

为研究不同胶结层材料对装配式混合连接钢-混凝土组合梁受力性能及粘结性能的影响,设计制作了2根3 m跨径的试验梁进行静载试验。胶结层材料分别为环氧砂浆和C60水泥基灌浆料,其它参数不变。通过试验对比分析了试件的破坏模式、极限承载力、荷载-挠度曲线、荷载-滑移曲线和沿梁高应变曲线。研究表明,在弹性阶段,C60水泥基灌浆料的最大滑移量仅为环氧砂浆的62.7%,采用C60水泥基灌浆料作为胶结层在弹性阶段可以明显减少混凝土板与钢梁之间的滑移量,粘结性能更优;在塑性阶段,C60水泥基灌浆料的滑移量急剧增大,因此破坏阶段时环氧砂浆的粘结力稍强。

In order to study the effects of different cementitious layer materials on the mechanical properties and bonding properties of fabricated hybrid connected steel-concrete composite beams,two 3 m span test beams were designed and manufactured for static load test.The materials of the cementation layer are epoxy mortar and C60 cement-based grouting material respectively,and other parameters remain unchanged.The failure mode,ultimate bearing capacity,load deflection curve,load slip curve and strain curve along the beam height are compared and analyzed.In the elastic stage,the maximum slip amount of C60 cement-based grouting is only 62.7% of that of epoxy mortar.Using C60 cement-based grouting material as cementation layer can significantly reduce the slip amount between concrete slab and steel beam in the elastic stage,and the bonding performance is better.In the plastic stage,the slip amount of the C60 cement-based grouting material increases sharply,so the cohesive force of the epoxy mortar is slightly stronger in the failure stage.