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Damage of Infill Masonry Walls due to Vertical Loads in Buildings with Reinforced Concrete Structure
Buildings are subjected to deformations of their reinforced concrete structure due to vertical loadsthat can lead, in certain cases, to the significant cracking of the unreinforced masonry (URM) infill walls,therefore requiring the development of specific knowledge of these types of deformations in order to minimisethem.Aiming the evaluation of buildings with reinforced concrete structures subjected to vertical deformations, themechanical characteristics of their infill masonry walls, as well as of their interface with the supportingconcrete elements, are here analysed. The basic compression behaviour of brick masonry is assessedparticularly through the previous analysis of a vertical compression test of a masonry specimen. Themechanical behaviour characteristics of the constituents (bricks, and mortar joints) are analysed to account fortheir influence on the compression behaviour of masonry infill, aiming particularly for the prevision of theircracking in case of vertical deformations of the supporting reinforced concrete (RC) elements. Based on thatevaluation, the analysis of masonry walls subjected to vertical deformations of their supports is made throughthe assessment of the relevant characteristic behaviour of masonry wall-beam/slab assembly in case of verticalload. A general modelling approach of the behaviour of URM infills and the interaction with their supports isgenerally accessed. Finally, the preventive control of deformations of masonry wall-beam/slab assembly isdiscussed.
Year: 2023
Number Pages:
32-49pp.
Author(s): Miranda Dias, J.
: Journal - WSEAS Transactions on Applied and Theoretical Mechanics (artigo disponível no link: https://wseas.com/journals/articles.php?id=7765)
Editor: WSEAS TRANSACTIONS
Volume:
Vol. 18, Art. #4.
Keywords: Buildings; Vertical loads; Reinforced concrete elements; Masonry infill walls
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Damage of infill masonry walls due to vertical loads in buildings with reinforced concrete structure
Buildings are subjected to deformations of their reinforced concrete structure due to vertical loads that can lead, in certain cases, to the significant cracking of the unreinforced masonry (URM) infill walls, therefore requiring the development of specific knowledge of these types of deformations in order to minimise them.Aiming the evaluation of buildings with reinforced concrete structures subjected to vertical deformations, themechanical characteristics of their infill masonry walls, as well as of their interface with the supportingconcrete elements, are hereanalysed. The basic compressionbehaviour of brick masonry is assessedparticularly through theprevious analysis of a vertical compression test of a masonry specimen. Themechanical behaviour characteristics of the constituents (bricks, and mortar joints) are analysed to account for their influence on the compression behaviour of masonry infill, aiming particularly for the prevision of theircracking in case of vertical deformations of the supportingreinforced concrete (RC) elements. Based on thatevaluation, the analysis of masonry walls subjected to vertical deformations of theirsupports is made throughthe assessment of the relevant characteristic behaviour of masonry wall-beam/slab assembly in case of vertical load. A general modelling approach of the behaviour of URM infills and the interaction with their supports is generally accessed. F inally, the preventive control of deformations of masonry wall-beam/slab assembly is discussed
Year: 2023
Number Pages:
32-49pp..
Author(s): Miranda Dias, J.
: WSEAS Transactions on Appled and Theoretical Mechanics
Editor: WSEAS
Volume:
Vol. 18, Art.#4.
Keywords: Buildings; Vertical loads; Reinforced concrete elements; Masonry infill walls
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Decisões estratégicas no ciclo de vida dos ativos construídos baseadas em informação técnico-funcional e financeira
As funções financeiras e as funções relacionadas com o desempenho técnico e funcional (não financeiras) estão incorporadas nas atividades de gestão do ciclo de vida de qualquer dos ativos construídos. Essas funções fornecem informação relevante para o estabelecimento de estratégias de operação e de manutenção, bem como para o processo de tomada de decisão relacionado com investimentos a longo prazo em reparações, substituições e reabilitações. O objetivo deste artigo é demonstrar os efeitos da utilização destes dois tipos de funções nas decisões estratégicas de longo prazo da gestão de ativos. Esta demonstração é feita por recurso a uma análise de informação financeira, técnica e funcional de portefólios de edifícios. Para tal, apresenta-se um caso de estudo de dois edifícios escolares públicos construídos, respetivamente nas décadas de 40 e 80 do século passado, nos quais foram realizadas intervenções profundas de reabilitação no ano de 2010. Consideram-se e comparam-se os efeitos das funções utilizadas para apoiar o processo de tomada de decisão nos períodos que antecederam e sucederam essas intervenções. Os resultados dos cálculos de taxas de depreciação funcional equivalente e financeiras, mostram um desalinhamento entre funcões financeiras e não financeiras e realçam a importância de que se promova esse alinhamento, tendo em vista uma otimização da gestão do ciclo de vida destes edifícios.
Year: 2023
Number Pages:
43-55pp..
Author(s): Salvado, A.; Almeida, N.; Vale e Azevedo, A.
: RAE
Editor: Ponteditora
Volume:
Vol. 1, N.º 1.
Keywords: Custo do Ciclo de Vida; Taxas de depreciação; Funções financeiras; Funções técnicas e funcionais; Gestão de edifícios
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Impacto da reabilitação na melhoria da resiliência de edifícios escolares públicos
A segurança das pessoas e o elevado valor dos bens construídos e dos seus conteúdos, bem como a sua criticidade na satisfação das necessidades básicas e bem-estar das comunidades, sempre suscitaram preocupações quanto à sustentabilidade, resiliência e fiabilidade do ambiente construído. A resiliência dos ativos construídos está frequentemente ligada à formulação de políticas e estratégias para o ambiente construído após eventos catastróficos ou traumáticos. É um conceito multidimensional que abrange aspetos físicos, infraestruturais,ambientais, económico-sociais, regulamentares e organizacionais. O presente artigo apresenta os resultados da aplicação de um sistema de classificação de resiliência assente numa abordagem holística, abrangente e sistemática, a diferentes tipos de edifícios, em qualquer fase do seu ciclo de vida. Em particular, analisa a resiliência de edifícios de escolas públicas portuguesas a diferentes riscos do ponto de vista da engenharia, nomeadamente no que diz respeito à segurança estrutural e de manutenção do edifício. Os edifícios escolares analisados, construídos ao longo do século XX, tiveram intervenções alargadas, entre 2009 e2011, no âmbito de um programa nacional de investimento público. Os edifícios foram analisados antes e após intervenções de reabilitação. Relativamente a indicadores económicos e a investimento potencial, nota-se que as intervenções de reabilitação apresentam impacto positivo na classificação da resiliência
Year: 2023
Number Pages:
69-80pp.
Author(s): Falcão Silva, M. J.; Salvado, A.; Almeida, N.
: RAE
Editor: Ponteditora
Volume:
Vol. 1, N.º 1.
Keywords: apoio à decisão; sistema de classificação; gestão de ativos; edifícios; Resiliência urbana
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Mutual Effect Between Moisture Transfer and Mechanical Response in Infill Masonry Walls of Reinforced Concrete Building Envelope
The external envelope of buildings with reinforced concrete structures (RCS buildings) is subjected to environmental actions, particularly related to wind-driven rain (WDR), external humidity variations, and rising dampness, which can cause significant variations in moisture content to their unreinforced masonry (URM) infill walls, mainly associated to water penetration across that envelope. The consequent moisture transfer across the envelope can change the mechanical response of the URM infill walls and lead to their cracking, which could aggravate the referred water penetration, with a subsequent increase in the risk of building envelope degradation. In reverse, the effects of mechanical loads on moisture transfer across that envelope can be also relevant, in terms of change in the moisture content of these URM infill walls. The aim here is to analyze this type of mutual effect between moisture transfer and mechanical response in URM infill walls of RCS buildings. Essential elements about the characteristics of moisture transfer across URM infill walls and of the interface resistance with moisture flows are summarily described, and the essential evaluation of the mechanical behavior of URM infill walls when subjected to moisture variations is carried out. Moisture transport characteristics are discussed, focusing on analyses of the behavior of masonry elements when subjected to moisture variations. An initial assessment of the mechanical behavior of URM infill walls when subjected to different moisture variations is made through a compression test of a brick masonry specimen with variable moisture content. Following that analysis, an evaluation is made of the moisture transfer in URM infills, as well as the influence of the interface between layers in that moisture transfer and, subsequently, an assessment is made of hygromechanical couplings. Finally, elements for prevention about the causes of degradation of URM infill related to humidity and mechanical actions in the RCS building envelope are discussed.
Year: 2023
Number Pages:
177-193pp..
Author(s): Miranda Dias, J.
: International Journal on Applied Physics and Engineering (URL do artigo: https://wseas.com/journals/articles.php?id=8628)
Editor: WSEAS
Volume:
Volume 2.
Keywords: Service life; Buildings; Mechanical behavior; Moisture transfer; Infill masonry walls
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Ultrasonic pulse velocity testing for monitoring the degradation of infill masonry walls and access their impact on the durability of the envelope of buildings with reinforced concrete structure
Buildings with reinforced concrete structure (RCS buildings), including unreinforced masonry (URM) infill walls, can be negatively affected by anomalies in their envelope, such as cracking and water penetration, which worsen the aesthetic aspect and reduce the safety and level of comfort of those buildings. To access the relevance of these anomalies and their evolution along service life, a corresponding survey and monitoring during service life are essential. Non-destructive test methods (NDT), in particular ultrasonic pulse velocity (UPV) testing, are currently used in that survey and monitoring. In the context of monitoring the degradation of the URM infill walls and access their impact on the durability of the RCS building envelope, UPV testing can be a type of NDT method to be used, considering that it can contribute to the evaluation of the state of conservation of the construction elements, such as masonry and concrete. It is intended here to access the potential use of UPV testing in the monitoring of anomalies related to the degradation of building facades due, particularly, to cracking and to water penetration associated with WDR (wind driven-rain). The preliminary assessment of the use of UPV testing is made through the previous analysis of the results of the application of UPV testing for the detection of sub-surface and surface cracking in compression tests of masonry specimens. Following that analysis, an evaluation is made of the conditioning aspects of the use of UPV testing to access durability problems of the building envelope. Particularly, the main characteristics of cracking with interest for the assessment of the potential use of UPV testing are generally discussed. And, finally, an evaluation is made of the risk of water penetration through the cracks, for potential use of UPV testing in monitoring the presence of humidity in the cracks.
Year: 2023
Number Pages:
917-943pp..
Author(s): Miranda Dias, J.
: WSEAS Transactions on Environment and Development (artigo disponível no link: https://wseas.com/journals/articles.php?id=8274)
Editor: WSEAS TRANSACTIONS
Volume:
Volume 19, Art. #87.
Keywords: Durability; Service life; Buildings; Infill masonry walls; Ultrasonic pulse velocity testing
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Ultrasonic pulse velocity testing for monitoring the degradation of infill masonry walls and access their impact on the durability of the envelope of buildings with reinforced concrete structure
Buildings with reinforced concrete structure (RCS buildings), including unreinforced masonry (URM) infill walls, can be negatively affected by anomalies in their envelope, such as cracking and water penetration, which worsen the aesthetic aspect and reduce the safety and level of comfort of those buildings. Toaccess the relevance of these anomalies and their evolution along service life, a corresponding survey andmonitoring during service life are essential. Non-destructive test methods (NDT), in particular ultrasonic pulsevelocity (UPV) testing, are currently used in that survey and monitoring. In the context of monitoring thedegradation of the URM infill walls and access their impact on the durability of the RCS building envelope,UPV testing can be a type of NDT method to be used, considering that it can contribute to the evaluation of the state of conservation of the construction elements, such as masonry and concrete.It is intended here to access the potential use of UPV testing in the monitoring of anomalies related to thedegradation of building facades due, particularly, to cracking and to water penetration associated with WDR(wind driven-rain). The preliminary assessment of the use of UPV testing is made through the previous analysis of the results of the application of UPV testing for the detection of sub-surface and surface cracking in compression tests of masonry specimens. Following that analysis, an evaluation is made of the conditioning aspects of the use of UPV testing to access durability problems of the building envelope. Particularly, the main characteristics of cracking with interest for the assessment of the potential use of UPV testing are generally discussed. And, finally, an evaluation is made of the risk of water penetration through the cracks, for potential use of UPV testing in monitoring the presence of humidity in the cracks.
Year: 2023
Number Pages:
917-943pp..
Author(s): Miranda Dias, J.
: WSEAS Transactions on Environment and Development
Editor: WSEAS
Volume:
Vol. 19, Art.#87.
Keywords: Durability; Service life; Buildings; Infill masonry walls; Ultrasonic pulse velocity testing
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Enhancing urban resilience evaluation systems through automated rational and consistent decision-making simulations
Urban resilience is an increasingly important topic because of the need to protect and optimize the value derived from the urban built environment with its constructed assets. But there is still no harmonized definition or a consensual set of descriptors for this multi-dimensional concept. This paper aims to address this knowledge gap by outlining an Urban Resilience Evaluation System (URES) with a breakdown structure of 16 indicators and 75 parameters grouped into five interrelated dimensions: environmental, economic, organizational, social, and technical. The resilience scoring of the constructed assets relies on a novel Multi-Criteria Decision Analysis (MCDA) approach adapted from the Analytic Hierarchy Process (AHP) method. This novel approach involves Automated Rational and Consistent Decision Making (ARCDM) to pre-conceptualize and simulate behavior scenarios of a virtual panel of experts with different perspectives. These behavior scenarios are organized into a pairwise multilayer decision-making matrix that overrides the need for surveys. The authors use a portfolio of buildings with seven different use types (residential, research facilities, schools, hospitals, industrial facilities, shopping centers, and hotels) to test the applicability of the proposed URES breakdown structure for buildings with different levels of importance. This allows the comparison and validation of various ranges of results expressing different perspectives.The proposed methodology can be readily used by various stakeholders of the Architecture, Engineering,Construction, and Operation (AECO) sectors involved in the lifecycle management decisions and activities ofconstructed assets. It impacts feasibility studies, design, construction, operation and maintenance, rehabilitation, and disposal of constructed assets that comprise the built environment for cities and societies.
Year: 2022
Author(s): Almeida, N.; Falcão Silva, M. J.; Duarte, M.
: Sustainable Cities and Society
Editor: Sustainable Cities and Society
Volume:
Volume 78.
Keywords: Analytic hierarchy process; Automated decision making; Simulation; Constructed assets; Evaluation system; Urban resilience
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Reabilitação Energética de Edifícios Baseada na Metodologia BIM
A reabilitação de edifícios tem crescido nos últimos anos, sendo uma das áreas com maior investimento do setor público e privado. O desafio na reabilitação de edifícios permite reduzir o uso de recursos, tentando reduzir o impacto ambiental e tornando o setor de construção mais eficiente. O principal objetivo da pesquisa desenvolvida é compreender como o uso de ferramentas digitais permite uma abordagem mais eficiente na reabilitação energética de um edifício. Desta forma, e considerando diferentes soluções de reabilitação, é possível realizar uma análise de alternativas, comparando-as com a solução base e assim sendo capaz de compreender quais são os ganhos energéticos, bem como a solução ótima. Os resultados serão apresentados possibilitando a comparação com medidas reais e os parâmetros de referência dos padrões para desempenho térmico. A possibilidade de editar as propriedades térmicas dos materiais de construção considerados, permite a realização de várias simulações com diversas combinações de possíveis melhorias. Os resultados obtidos podem ser parte integrante de uma análise de custo-benefício para apoiar a tomada de decisão
Year: 2022
Number Pages:
52-58pp.
Author(s): Falcão Silva, M. J.; Couto, P.; Pinho, F.; Silva, S.
: Gestão e Gerenciamento
Editor: Gestão e Gerenciamento
Volume:
v. 14, nº 14.
Keywords: Buildings with public interest; Rehabilitation; Building Sustainable; BIM
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Fendilhação de paredes de alvenaria relacionada com a deformação dos elementos de apoio de betão armado
N/A
Year: 2010
Number Pages:
17.
Author(s): Miranda Dias, J.
: Cadernos Edifícios - Conservação e Reabilitação de edifícios recentes
Editor: LNEC
Volume:
CAD 5.
Keywords: Betão armado; Paredes de alvenaria
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