A shear warping kinematic enhancement for fiber beam elements with a damaging cross-section

The present paper is dedicated to the modeling of non-linear behavior reinforced concrete structures subject transverse shear or torsion under monotonic and cyclic loading. fiber beam element approach has been proved be an interesting strategy, but needs improved for effects. This can achieved by enhancing cross-section kinematics with a warping displacement field. field must free from rigid body motions, problem well posed. condition enforced projecting displacements orthogonally space plane displacements. contribution proposes kinematic enhancement Timoshenko new formulation projection functions. shape computed along rotations implicit solution procedure. proposed takes into account possible material heterogeneity cross-section. It enables profile evolve in time damage state, as may occur structures. validated using analytical case shear, 3D simulations beams torsion. To address nonlinear behavior, comparison experimental results performed. first study shows that including model drastically improves prediction second ability deal bending column.