Analysis of Shear-Critical Reinforced Concrete Plane Frame Elements under Cyclic Loading

Abstract

An analytical procedure was recently developed for the nonlinear analysis of reinforced concrete frame structures consisting of beams, columns, and shear walls under monotonic loading. The procedure is distinct from others because it is capable of inherently and accurately considering shear effects and significant second-order mechanisms with a simple modeling process suitable for use in practice. In this study, the procedure is further developed to enable the performance assessment of shear-critical frame structures under general (arbitrary) loading, including the special cases of cyclic and reversed-cyclic loads. Newly developed and implemented formulations are described and applied to 11 previously tested specimens for verification. Important considerations in nonlinear modeling and the limitations of the procedure are also discussed. The procedure is found to accurately simulate the overall experimental behaviors of the specimens examined. Performance measures, such as load and deformation capacities, stiffnesses, energy dissipations, ductilities, failure modes, crack widths, and reinforcement strains, are typically captured well. The procedure exhibits excellent convergence and numerical stability, requiring little computational time.

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

“…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.…”

Modeling Flexure-Shear Failures in Masonry-Infilled Rc Frames With Inelastic Fiber-Based Frame Elements

“…Several element formulations have been previously presented following a similar approach [13,14,15]. The main differences, however, concerned the type of constitutive model for reinforced concrete, e.g.…”

Reinforced Concrete Frames Strengthened by Tension-Tie Elements Under Cyclic Loading: A Computational Approach

“…First, the structural system is discretized in space by usual Finite Elements (FE). The macroelements approach [8][9][10]24] is preferable to the micro-elements one [18] for practical applications that concern multi-story multi-span RC frames. The most complex FE models are appropriate mainly for studying details and the simulation of tests on individual members or subassemblies due to their severe computational requirements and numerous input parameters [26].…”

“…Such micro-modeling methodologies are suitable for simulating simple laboratory RC frames of single-span and one or two stories [18,19]. However, as emphasized by Fardis et al [20], these methods seem to be very time-consuming and prohibiting for multi-story, multi-span RC frames, as is the case of the most common practical applications.…”

“…Concerning the shear-flexure behavior of old RC structures under seismic actions a numerical procedure for shear-critical RC frames using layer-fiber micro-modeling in the sectional analysis has been presented [18]. Such micro-modeling methodologies are suitable for simulating simple laboratory RC frames of single-span and one or two stories [18,19].…”