Numerical analysis of plain and fiber reinforced concrete structures during cyclic loading: Influence of frictional sliding and crack roughness

Concrete is a quasi-brittle material, characterized by non-negligible, finite-sized fracture process zone (FPZ) in which various toughening mechanisms play significant role on crack development and propagation. often reinforced with fibers to improve the serviceability longevity of concrete structures controlling maximal widths providing residual carrying capacity initiated cracks. In materials such as concrete, deflection due presence large heterogeneities, contact shielding, i.e., wedging closure induced debris rough faces, bridging tough aggregates, unbroken ligaments (in fiber-reinforced concretes), are mostly governing damage evolution under monotonic especially cyclic loadings [1]. All these items contribute complex non-linear response terms load-displacement curves observed experimental investigations. Many investigations have been performed plain but not so many for high-performance [2] main subject investigation within DFG Priority Program 2020. order better understand influence formation hysteresis during loading-unloading steel we model their evolving using discrete approach, take into account imperfect cracks friction between faces that come loading/unloading specimen. Within scope this contribution, present formulation illustrate its performance through selected numerical experiments loading specimens. Model predictions compared laboratory measurements.