Analysis of shear‐dominated RC columns using the nonlinear truss analogy

Abstract

Summary This paper uses nonlinear truss models for the analysis of shear‐dominated reinforced concrete (RC) columns subjected to cyclic loading. A previously established method, aimed to the analysis of RC walls, is enhanced to allow simulations of column members. The concrete constitutive equations are modified to account for the contribution of the aggregate interlock to the shear resistance. Additionally, an equation is proposed to determine the inclination angle of the diagonal members in the truss models. The modeling approach is validated using the results of quasi‐static and dynamic tests on shear‐dominated RC columns. The combination of predictive capabilities and conceptual simplicity establishes truss‐based models as an attractive approach for the systematic analysis of shear‐dominated RC frame construction. Copyright © 2014 John Wiley & Sons, Ltd.

Finite element analysis of damage and failure of reinforced concrete members under earthquake loading

“…The modulus of elasticity of the concrete is assigned a value of 2f c /ε ο . The parameter M in Equation is calibrated in accordance with Moharrami et al, and the value of λ t is found using the equation by Bažant for the mode‐I fracture energy, G t . The compressive fracture energy, G c , is set equal to 100 G t , based on recommendations by Feenstra .…”

“…In all analytical models, the Poisson 0 s ratio, v, is set equal to 0. 58 and the value of λ t is found using the equation by Bažant 59 for the mode-I fracture energy, G t . The compressive fracture energy, G c , is set equal to 100G t , based on recommendations by Feenstra.…”

“…The figure indicates that ignoring the strain penetration effect has a minor impact, leading to a slight increase in the stiffness and peak strength. This conclusion only applies for the walls considered in the parametric analysis, as previous studies have shown that strain penetration is important for analysis of columns or beam‐to‐column connections…”

Numerical modeling of rebar buckling in reinforced concrete members using truss analogy

“…A truss model is idealized by using principal stress trajectories obtained from linear analysis [1]. Nonlinear truss model is established by assignment of location of horizontal elements including longitudinal rebars for beams and diagonal element angles [16]. Truss model herein uses elements in the horizontal, vertical and diagonal directions representing steel reinforcement and concrete areas.…”

“…Lu and Panagiotou [15] developed a nonlinear beam-truss modeling approach for modeling RC walls. Moharrami et al [16] enhanced the truss model for analysis of shear-critical RC columns including the contribution of aggregate interlock effects. Lu et al [17] presented a 3-D truss model for structures including walls and slabs with mesh refinement in the bottom story.…”