This paper presents a two-dimensional interface model for timber-concrete contacts, that has been developed based on the empirical observations from a set of friction tests and additional micromechanical assumptions. In tangential direction, the interface model accounts initial bonding and debonding between the surfaces, different static and kinetic friction as well as smooth transition between them, effects of load reversal, pressure-dependence in friction and sticking stiffness and slip softening over increasing cumulative slip. In normal direction, simple linear cohesive and pressure-overclosure behaviour is assumed. The model has been formulated in cohesive-frictional interface framework, coupling damage-based cohesive behaviour with elastoplasticity-based frictional behaviour. The model has been tested in various cases and verified by comparison on a set of 27 tests on timber-concrete contact pairs under cyclic loading with varying normal pressure and multiple different material pairs. The interface model is able to capture relevant parts of the experimentally observed tangential behaviour, indicating suitability to present timber-concrete interface behaviour under cyclic loading.

本文提出了木材-混凝土接触的二维界面模型，该模型是基于从一组摩擦测试和其他微机械假设中获得的经验观察而开发的。在切线方向上，界面模型考虑了表面之间的初始粘合和脱粘、不同的静摩擦和动摩擦以及它们之间的平滑过渡、载荷反转的影响、摩擦和粘着刚度的压力依赖性以及随着累积滑移增加的滑移软化。在法线方向，假设简单的线性内聚和压力过度闭合行为。该模型已在内聚摩擦界面框架中制定，将基于损伤的内聚行为与基于弹塑性的摩擦行为耦合。该模型已经在各种情况下进行了测试，并通过在不同法向压力和多种不同材料对的循环载荷下对木材-混凝土接触对进行的一组 27 次测试进行了比较来验证。界面模型能够捕捉实验观察到的切向行为的相关部分，表明在循环载荷下呈现木材-混凝土界面行为的适用性。