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Stress-strain behavior of concrete block masonry prisms under compression
Mohamad, Gihad; Lourenço, Paulo B.; Roman, Humberto R.; Barbosa, C. S.; Rizzatti, EduardoThe aim of this work is to critically assess a stress-strain model using experimental masonry prisms constructed from different blocks and mortar. The following conclusion may be drawn from this work: mortar is mostly responsible for the non-linear behavior of masonry. The initial tangent modulus, obtained taking into account the compressive strength, provides a strongly non-linear relationship between elastici...
On the compressive strength prediction for concrete masonry prisms
Barbosa, C. S.; Lourenço, Paulo B.; Hanai, J. B.The results of a combined experimental program and numerical modeling program to evaluate the behavior of ungrouted hollow concrete blocks prisms under uniaxial compression are addressed. In the numerical program, three distinct approaches have been considered using a continuum model with a smeared approach, namely plane-stress, plane-strain and three-dimensional conditions. The response of the numerical simula...
Numerical validation of compressive strength prediction for hollow concrete blocks
Barbosa, C. S.; Hanai, J. B.; Lourenço, Paulo B.The results of a numerical modeling program to evaluate the behavior of hollow concrete blocks under uniaxial compression are addressed. It has been considered appropriate to use interface elements to represent the confinement effect at the top and bottom of blocks. The response of the numerical simulations is compared with experimental data of masonry units. Laboratory tests were carried out utilizing standard...
Modelo matemático de blocos vazados de concreto submetidos à compressão
Barbosa, C. S.; Hanai, J. B.; Lourenço, Paulo B.As unidades de alvenaria estão sujeitas ao efeito de confinamento resultante do atrito ocasionado pelas placas de ensaio quando submetidas ao ensaio de compressão. Essa restrição ocasiona o aumento do valor de sua resistência e uma distribuição não uniforme das tensões ao longo de suas paredes longitudinais e septos transversais. Este trabalho apresenta um modelo numérico que simula o comportamento de blocos va...
Triaxial compression tests on bedding mortar samples looking at confinement eff...
Barbosa, C. S.; Lourenço, Paulo B.; Mohamad, Gihad; Hanai, J. B.This paper presents an analysis of the mechanical behavior of bedding mortar samples under triaxial compression tests. When masonry is subjected to vertical loads, mechanical interactions between blocks and bedding mortar at the joints induce lateral tension and compression stresses. Thus, the mortar layer is submitted to a triaxial stress state that modifies its mechanical properties and behavior under confine...
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