Dynamic Geometrically Nonlinear Behavior of FRP-Strengthened Walls with Debonded Regions

On the effect of inter-laminar contact on the dynamics of locally delaminated FRP strengthened walls

“…The slenderness of the delaminated FRP layer makes it susceptible to local buckling and wrinkling [10]. These geometrically non-linear phenomena involve rapid changes to the displacements field in the FRP layer, which, in turn, trigger a dynamic response [11]. The geometrical non-linearity and the dynamic evolution are strongly coupled [11].…”

“…These geometrically non-linear phenomena involve rapid changes to the displacements field in the FRP layer, which, in turn, trigger a dynamic response [11]. The geometrical non-linearity and the dynamic evolution are strongly coupled [11]. This necessitates the use of a geometrically non-linear and dynamic modeling platform for the analysis of the locally delaminated wall.…”

“…In some cases, the damaged interface includes the presence of void at the delamination plane. For such cases, which were studied, for example, in [11], the assumption that the layers are not in contact throughout the entire response interval is justified. In the general case where the delaminated layer can touch the substrate, the contact zones change along the loading process.…”

“…To achieve this, the paper develops an analytical model for the contact effect in the delaminated wall and converts it into a finite element formulation. The general concepts of the model and its FE counterparts follow the ones presented in [10,11] for static and dynamic analyses, respectively. In this work, another step is taken and the non-linear effect of the inter-laminar contact, its temporal variation, the variation of the 2D contact map in the delaminated region, and the interaction of these effects with the geometrically non-linear response are introduced.…”

“…Elmalich and Rabinovitch [11] studied the dynamic aspects of the geometrically non-linear behavior of a strengthened wall with local delamination. This work took a step into the dynamic regime and clarified many of the physical phenomena that are associated with the geometrically non-linear instability.…”