New Opensees Models for Simulation of Nonlinear Flexural and Shear-Flexural Interaction Behavior of Reinforced Concrete Walls and Columns

Abstract eng:
Existing approaches used to model the lateral load versus deformation responses of reinforced concrete (RC) members typically assume uncoupled axial/flexural and shear responses. A novel analytical model that captures interaction between axial/flexural and shear behavior in RC walls and columns under reversed-cyclic loading conditions has been developed and implemented into the computational platform OpenSees. The proposed modeling approach incorporates RC panel behavior described with a constitutive fixed-strut-angle panel model into a two-dimensional Multiple-Vertical-Line-Element-Model (MVLEM) formulation. This paper describes new classes added to the existing OpenSees library including: 1) baseline MVLEM element with uncoupled axial/flexural and shear behavior, 2) Shear-Flexure-Interaction MVLEM (SFI-MVLEM) element, 3) 2-D RC panel model based on the fixed-strut-angle approach, 4) uniaxial material model for concrete, and 5) uniaxial material model for steel. In addition, validation of the analytical models for quasi-static analysis of: i) RC column specimen using the SFI-MVLEM, ii) a relatively slender RC wall specimen with flexure-dominated response using the MVLEM, and iii) a moderate-aspect-ratio RC wall specimen with flexure-shear dominated response using the SFIMVLEM, are presented. Response comparisons reveal that the implemented analytical models capture well the experimentally-measured behavior of RC structural walls and columns. Based on the comparisons presented, model capabilities are assessed and potential model improvements are identified.

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