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A constitutive model for a novel modular all-steel buckling restrained brace

Buckling Restrained Braces (BRBs) are installed in buildings to control lateral displacements caused by seismic events. Modelling BRBs involves predicting their hysteretic load-deformation curve and failure. We can distinguish between global models, adjusted with experimental tests, and local models, based on the constitutive equations for materials. Local models are usually implemented in FEM codes and, while they also require experimental verification, they can be extended to a wider range of geometries and materials.In this paper a new material constitutive model is proposed for predicting the hysteretic response and failure of a new all-steel BRB. This BRB offers an almost symmetric response for both compression and tensile loading because of the low interaction between the core and the restraining unit. The hysteretic behaviour is simulated using a combined isotropic and kinematic hardening as a function of the plastic flow. Damage is computed using an uncoupled analysis based on a continuum damage mechanism model. The results from the tensile and BRB tests are used to adjust and verify the model.The model has been implemented in an FEM commercial code and has proved effective in simulating the hysteretic response and predicting the failure point of the new all-steel BRB. The model presented could be extended to BRBs in general, although interaction between the core and the restraining unit would have to be taken into account

This work has been supported by the Spanish Government under Projects MEC BIA2011 26816 and MAT2013-46749. The research group AMADE (University of Girona) and the Bellapart Company (Olot – Spain) have collaborated with the research work and their help is gratefully acknowledged

© Engineering Structures, 2015, vol. 100, p. 326-331

Elsevier

Author: Piedrafita Francos, Daniel
Maimí Vert, Pere
Cahís Carola, Francesc Xavier
Date: 2015
Abstract: Buckling Restrained Braces (BRBs) are installed in buildings to control lateral displacements caused by seismic events. Modelling BRBs involves predicting their hysteretic load-deformation curve and failure. We can distinguish between global models, adjusted with experimental tests, and local models, based on the constitutive equations for materials. Local models are usually implemented in FEM codes and, while they also require experimental verification, they can be extended to a wider range of geometries and materials.In this paper a new material constitutive model is proposed for predicting the hysteretic response and failure of a new all-steel BRB. This BRB offers an almost symmetric response for both compression and tensile loading because of the low interaction between the core and the restraining unit. The hysteretic behaviour is simulated using a combined isotropic and kinematic hardening as a function of the plastic flow. Damage is computed using an uncoupled analysis based on a continuum damage mechanism model. The results from the tensile and BRB tests are used to adjust and verify the model.The model has been implemented in an FEM commercial code and has proved effective in simulating the hysteretic response and predicting the failure point of the new all-steel BRB. The model presented could be extended to BRBs in general, although interaction between the core and the restraining unit would have to be taken into account
This work has been supported by the Spanish Government under Projects MEC BIA2011 26816 and MAT2013-46749. The research group AMADE (University of Girona) and the Bellapart Company (Olot – Spain) have collaborated with the research work and their help is gratefully acknowledged
Format: application/pdf
ISSN: 0141-0296
Document access: http://hdl.handle.net/10256/12050
Language: eng
Publisher: Elsevier
Collection: MINECO/PE 2014-2017/MAT2013-46749-R
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.engstruct.2015.06.026
Articles publicats (D-EMCI)
Is part of: © Engineering Structures, 2015, vol. 100, p. 326-331
Rights: Tots els drets reservats
Subject: Edificis -- Efecte dels terratrèmols
Buildings -- Earthquake effects
Flexió (Mecànica)
Flexure
Esforç i tensió
Strains and stresses
Resistència de materials
Strength of materials
Title: A constitutive model for a novel modular all-steel buckling restrained brace
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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