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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal for Multiscale Computational Engineering
Импакт фактор: 1.016 5-летний Импакт фактор: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Печать: 1543-1649
ISSN Онлайн: 1940-4352

Выпуски:
Том 17, 2019 Том 16, 2018 Том 15, 2017 Том 14, 2016 Том 13, 2015 Том 12, 2014 Том 11, 2013 Том 10, 2012 Том 9, 2011 Том 8, 2010 Том 7, 2009 Том 6, 2008 Том 5, 2007 Том 4, 2006 Том 3, 2005 Том 2, 2004 Том 1, 2003

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2014008118
pages 155-175

DISCRETE ELEMENT MODEL FOR IN-PLANE LOADED VISCOELASTIC MASONRY

Daniele Baraldi
Università IUAV di Venezia, Dorsoduro 2206, 30123, Venice, Italy
Antonella Cecchi
Department of Architecture Construction Conservation (DACC), University IUAV of Venice, Dorsoduro 2206, Venice, 30123, Venice, Italy

Краткое описание

A viscoelastic constitutive model is proposed to evaluate the evolution in time of historical masonry behavior. Masonry structures may be subject, over time, to damage due to creep phenomena, accompanied by a consequent redistribution of stresses and strains. Two models are presented and compared. A discrete element model and a continuous model based on analytical homogenization procedures. Both models are based on the following assumptions: (i) the structure is composed of rigid blocks; (ii) the time dependence of masonry behavior is concentrated in mortar joints, modelled as viscoelastic interfaces. The rigid block hypothesis is particularly suitable for historical masonry, in which stone blocks may be assumed as rigid bodies; the hypothesis of viscoelastic mortar is based on the observation that nonlinear phenomena may be concentrated in mortar joints. The continuum homogenized model provides, in an analytical form, constitutive equivalent viscous functions; the discrete model describes masonry as a rigid skeleton such as to evaluate both its global and local behavior. A parametric analysis is carried out to investigate the effect of (i) mortar-to-brick thickness ratio; (ii) masonry texture (running versus header bond); and (iii) size of heterogeneity (block dimensions) with respect to panel dimensions. Elementary cases are proposed to directly compare constitutive functions of continuum and discrete models. In addition, a meaningful case is proposed: a masonry panel in which the principal stresses are both of compression and the no-tension assumption may therefore be discounted. A further investigation pointed out the sensitivity to heterogeneity size such as to verify model reliability and applicability field.

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