An Exact Shear Strain Approach for Rc Frame Elements With Axial-Shear Interaction

Abstract

Abstract. A fiber-section frame element for nonlinear analysis of two-dimensional

3D Fiber‐Based Frame Element with Multiaxial Stress Interaction for RC Structures

“…From inspection of local strains in the longitudinal reinforcement, it was found that this did not yield for beam Figure 10: Lateral force-displacement response of the columns [29]. 8 Advances in Civil Engineering TBO3 but did yield for beam TBU3, with the values of 1.7‰ for TBO3 and 2.5‰ for TBU3 at the bottom ange. Concrete crushing occurred for the beam TBO3, reaching principal compressive strains of about 2.5‰ and corresponding stresses of 18 MPa, slightly less than f ′ c due to concrete softening at orthogonal tensile strains.…”

“…Some authors used an equivalent truss model in shear combined with the Euler-Bernoulli beam assumption and uniaxial stress response in flexure [3]. Further improvements were obtained when shear deformations were included in the element kinematics (Timoshenko beam theory) [4], which also allowed using two-dimensional constitutive models at each individual fiber based on either fixed [5][6][7] or variable shear strain profile [8]. Different constitutive models have been used, ranging from orthotropic smeared crack models (e.g., modified compression field theory (MCFT) [9] and fixed angle softened truss models (FA-STM) [10]) to softened plasticity damage models [11,12], and microplane models [13], among others.…”