A nonlinear visco-elastoplastic model for structural pounding

State-of-the-art pounding formulations do not consider eventual damage-induced changes regarding the collision description during an excitation time history. In particular, in case of multiple collisions, the pounding models remain unaltered. Thus, in this paper, a new pounding formulation is presented, whereby the state-of-the-art nonlinear viscoelastic model is enhanced by a dry friction element. This extension enables the description of degradation of collision surfaces by introducing an additional offset penetration parameter to the standard gap function. The phenomenological model of the new pounding formulation and the new corresponding pounding condition is presented and demonstrated on an illustrative numerical example. It is shown that the new formulation is capable of describing permanent damage effects caused by pounding collisions while preserving the desired physical properties of the nonlinear viscoelastic model.