法向力作用下钢-混界面黏结滑移性能

采用ABAQUS连接器单元模拟钢-混界面黏结滑移特性,并将预应力效应转化为界面法向力作用,建立了考虑法向力作用的钢板-混凝土界面黏结滑移试验的有限元模型,比较了试验和有限元模型的黏结滑移形态和黏结滑移曲线,分析了钢-混界面黏结滑移受力性能,研究了混凝土强度和法向力大小对界面黏结滑移性能的影响。通过有限元模型结果与试验结果,验证了该建模方法的有效性。结果表明:ABAQUS连接器单元能比较合理地模拟钢板-混凝土界面的黏结滑移性能; 法向力对界面峰值黏结力和残余阶段黏结力影响显著,但对峰值滑移量影响较小; 混凝土强度显著影响峰值黏结力,但对峰值滑移量和残余黏结力影响较小; 所得结论可为钢-混界面黏结滑移性能研究的有限元建模及黏结滑移关系选择提供参考。

Bond-slip Behavior of Steel-concrete Interface Under Normal Stress

The ABAQUS connector element model was used to simulate the bond-slip behavior of steel-concrete interface, and the prestressing effect was transformed into the normal stress of interface. The finite element model of bond-slip test of steel-concrete interface considering the normal stress was established. The bond-slip forms and bond-slip curves of the test and the finite element model were compared, and the bond-slip behavior of steel-concrete interface was analyzed. The influence of concrete strength and normal stress on the bond-slip behavior of interface was studied. The validity of the method was verified by the results of finite element model and experiment. The results show that ABAQUS connector element can reasonably simulate the bond-slip behavior of steel plate and concrete interface. The normal stress has a significant effect on the peak and residual stage bonding force, but has little effect on the peak slip. The concrete strength has a significant effect on the peak slip and residual bonding force, but has a little effect on the peak slip and the residual bonding force. The research results can provide a reference for the finite element modeling of bond-slip behavior of steel-concrete interface and the selection of bond-slip relationship.