Experimental investigations of the joint-mortar behaviour

Abdou, L.; Saada, Ramdane Ami; Meftah, Fékri; Mébarki, Ahmed

doi:10.1016/j.mechrescom.2005.02.026

Cited by 38 publications

(27 citation statements)

References 4 publications

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“…Apesar de melhorar as características do estado fresco, a presença de incorporadores de ar pode diminuir consideravelmente a extensão de aderência entre bloco e junta e levar ao aparecimento de fissuras horizontais principalmente nas paredes externas dos edifícios, as quais estão sujeitas a maiores tensões laterais oriundas do vento (KIM; ROBERTSON, [6]; CARASEK [7]; ABDOU et al [8]; CASALI [9]). No caso de blocos de resistência elevada, essas argamassas podem diminuir o fator de eficiência e modificar o mecanismo de ruptura da alvenaria.…”

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Influência do tipo de argamassa e suas propriedades do estado fresco nas propriedades mecânicas de alvenarias estruturais de blocos de concreto para edifícios altos

2015

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RESUMO O uso da alvenaria estrutural de blocos de concreto na construção de edifícios altos tem aumentado nos últimos anos em função da economia e racionalização que proporciona aos empreendimentos. Nessa busca pela otimização dos processos, o emprego de novos materiais, como as argamassas industrializadas, tem aumentado significativamente. Essas argamassas geralmente possuem aditivos na sua constituição, e apresentam vantagens de utilização, pois reduzem a responsabilidade de dosagem em obra, facilitam a gestão do canteiro e agilizam o processo de mistura e aplicação. Entretanto, em função da presença de aditivos, estudos indicam que essas argamassas, quando usadas para assentamento de blocos para alvenaria estrutural de resistências elevadas, podem não apresentar aderência adequada ao bloco, além de diminuir drasticamente o fator de eficiência e mudar o mecanismo de ruptura da alvenaria, que passa a ser por esmagamento da junta. Diante disso, foi estudado o desempenho de argamassas industrializadas ofertadas no mercado bem como traços de argamassas mistas empregados no Brasil para alvenarias estruturais de blocos de concreto de elevada resistência à compressão (16 Mpa), para construção de edifícios altos em alvenaria estrutural. A análise baseou-se na resistência à compressão, aderência e mecanismo de ruptura de prismas. Com base nas propriedades desejadas para argamassas empregadas em alvenaria estrutural de edifícios altos, o estudo concluiu que as argamassas mais comumente utilizadas no Brasil, não possuem a capacidade de gerar alvenarias com desempenho totalmente satisfatório.

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Influência do tipo de argamassa e suas propriedades do estado fresco nas propriedades mecânicas de alvenarias estruturais de blocos de concreto para edifícios altos

2015

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“…Extensive researches on shear behavior of brick mortar interface show that brick mortar bond shear strength follows up the Mohr-Coulomb Criterion which is a combination of shear cohesion and frictional strength [45]. Therefore, in current model cohesive contact elements with frictional behavior in shear are used to model the brick-mortar interface.…”

Section: Numerical Studymentioning

confidence: 99%

Application of Ordinary Fiber-Reinforced Concrete Layer for In-plane Retrofitting of Unreinforced Masonry Walls: Test and Modeling

et al. 2018

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The masonry walls should have sufficient in-plane strength and stiffness to withstand the seismic loads during strong ground shakings. Different retrofitting techniques are proposed for improving in-plane behavior of the Unreinforced Masonry (URM) walls. This study focuses on experimental evaluation and numerical simulation of a simple practical retrofitting technique employing Fiber Reinforced Concrete (FRC) surface layer. The simple FRC mix has conventional available fiber, low fiber content, ordinary mix design and applicable construction procedure. Effect of FRC mix including fiber type and fiber content and surface layer thickness on in-plane behavior of masonry panels made up of conventional solid clay bricks are evaluated through experimental study in accordance with ASTM E-519 diagonal tension strength of masonry panels. In addition, numerical simulation model of this retrofitting technique in ABAQUS software is proposed and validated with test results of bare and retrofitted panels.

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“…This interface presents a high level of variability due to the different compositions of the bricks and mortars used and its strength and behaviour is affected by the quality of the workmanship on site, water content of the masonry units and mortar, masonry units' shape and presence of voids as well as degradation due to weather conditions [9,16].…”

Section: General Overviewmentioning

confidence: 99%

Uncertainty in the numerical modelling of masonry triplet tests under dynamic loading

Puchades¹,

Judge²,

Beattie³

2016

Int. J. SAFE

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Masonry structures have been broadly used worldwide for centuries. These structures are likely to be subjected to seismic movements, malicious or accidental blast and/or impact loading. Expanding the current body of knowledge of how masonry structures perform under such conditions and developing reliable and robust modelling techniques is essential to improve both the efficiency and safety of the design and retrofitting of such structures. A great deal of research is currently ongoing to understand the behaviour of masonry under shock and impact loading, and this is proving to be a challenging endeavour. Masonry construction on the whole is surrounded by a high degree of variability ranging from the heterogeneity of the materials used, the degree of workmanship during construction and the uncertainty regarding the physical and mechanical properties of the brick-to-mortar interface. Masonry is known to experience a dynamic enhancement of its strength properties when subjected to impact loading and dynamic increase factors (DIFs) have been used to adjust static masonry properties accordingly when subjected to this type of loading. These DIFs are derived from sparse experimental tests and their use can be severely limited to the conditions of the tests performed, and the results obtained can carry a high degree of uncertainty. This paper considers the uncertainty present at the brick-to-mortar interface, by using Monte Carlo simulations, when subjected to dynamic loading in a standard triplet test using LS-DYNA. The results of the modelling have been compared, contrasted and discussed for use in a larger research project on the robust characterisation of masonry structures when subjected to blast and seismic loading.

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Experimental investigations of the joint-mortar behaviour

Cited by 38 publications

References 4 publications

Influência do tipo de argamassa e suas propriedades do estado fresco nas propriedades mecânicas de alvenarias estruturais de blocos de concreto para edifícios altos

Influência do tipo de argamassa e suas propriedades do estado fresco nas propriedades mecânicas de alvenarias estruturais de blocos de concreto para edifícios altos

Application of Ordinary Fiber-Reinforced Concrete Layer for In-plane Retrofitting of Unreinforced Masonry Walls: Test and Modeling

Uncertainty in the numerical modelling of masonry triplet tests under dynamic loading

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