Effects of support conditions and arrangement of prestressed rocking columns on the displacement of concrete frames under dynamic loads

Khodabakhshi, Nahid; Khaloo, Alireza

doi:10.1007/s10518-022-01365-4

Cited by 4 publications

(1 citation statement)

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“…(2008), 17 however, the a priori definition of plastic hinges in these models often prevents the realistic simulation of damage initiation and propagation, while also making the evaluation of axial force–bending moment interaction effects dependent upon iterative calibration procedures not necessarily valid for different axial load levels and moment gradients 18 . These issues are partially overcome in fiber‐based FE models, allowing the formation of plastic hinges at multiple integration points and whose formulation typically features sectional macro‐models with distributed plasticity, and reasonable agreement with outcomes from experimental campaigns on both building 19,20 and bridge 21,22 RC columns have been obtained by various authors. Nonetheless, the idealization of steel rebar and concrete interaction at integration points as homogenized continua often makes it difficult to simulate flexure‐shear responses of severely damaged RC columns, as the modeling of confinement effects is oversimplified 23 .…”

Section: Introductionmentioning

confidence: 99%

A new Distinct Element meso‐model for simulating the rocking‐dominated seismic response of RC columns

Scattarreggia

Malomo

DeJong

2022

Earthq Engng Struct Dyn

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The rocking-dominated seismic response of reinforced concrete (RC) columns is a complex mechanism that entails P-Δ effects, concrete crushing and spalling, rupture and dislocation of steel bars and stirrups, as well as combined localized failures causing splitting and shear-flexure cracking. In this paper, we present a new meso-scale numerical modeling strategy for the detailed simulation of the rocking response of slender RC columns under seismic actions. This work advances the current state-of-the-art by exploring the unprecedented use of the Distinct Element Method (DEM), originally conceived for geotechnical studies and whose applicability in earthquake engineering has been primarily limited to the assessment of unreinforced masonry sub-structures. To decrease analysis time and enable the use of DEM for RC problems, concrete is herein idealized as an assembly of solid macro-block layers of size directly proportional to their distance from expected plastic hinges. These layers are connected by nonlinear interface springs to simulate tensile and shear cracking via a simplified Mohr-Coulomb criterion. Crushing of concrete in deformable blocks is modeled using the Feenstra and De Borst strain-softening linearized compression law, while confinement and combined failures are accounted for numerically through the explicit representation of longitudinal and transversal reinforcement bars, idealized as link elements. Previous experimental static and dynamic tests on full-scale RC column specimens and results from fiber-based Finite Element and sectional analysis models are used to evaluate DEM results and quantify the influence of key modeling parameters, including block number and deformability, as well as the amount of damping. The agreement between simulated failure modes and force and displacement capacities and their experimental counterparts demonstrate the applicability of the proposed approach, while demonstrating the pros and cons of simplified numerical methods.

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