Artigos de Revista
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Desenvolver a qualidade arquitectónica e a satisfação residencial na nova habitação de interesse social portuguesa (série editorial: artigo 1/8)
No presente artigo faz-se a apresentação e o enquadramento justificativo e pormenorizado dos conteúdos, bases de referência e quadro qualitativo de uma série editorial dedicada ao desejável desenvolvimento da qualidade arquitectónica e da satisfação residencial na nova habitação de interesse social (HIS) portuguesa, ainda em falta, salientando-se que nos oito artigos previstos, nesta série, vai ser abordado, genericamente, o que caraterizou o passado da nossa HIS, para, em seguida, se refletir sobre o que poderá ser o futuro da Habitação de Interesse Social (HIS) portuguesa.Depois de um enquadramento geral da nova série editorial e sua principal temática registam-se e comentam-se as principais bases de apoio à reflexão sobre a nova HIS portuguesa, passando-se, em seguida, para o sublinhar da atenção que se julga dever ser dirigida para os melhores casos de referência habitacional e arquitectónica existentes e bem experimentados. Em seguida apresentam-se os estudos teórico-práticos ligados à análise retrospetiva habitacional e o processo de avaliação utilizado, durante cerca de 24 anos, no âmbito do trabalho do júri do Prémio INH/IHRU, considerados como principais elementos de base de conhecimento e apreciação do que foi a última
Ano: 2021
Número Páginas:
20p.
Autor(es): Baptista Coelho, A.
Revista: Infohabitar
Editor: GHabitar - Associação Portuguesa para a Promoção da Qualidade Habitacional (GHabitar APPQH)
Volume:
Infohabitar, Ano XVII, n.º 763.
Keywords: infohabitar; habitação social; arquitectura; habitação
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Designing for People's Safety on Flooded Streets: Uncertainties and the Influence of the Cross-Section Shape, Roughness and Slopes on Hazard Criteria.
Designing for exceedance events consists in designing a continuous route for overland flow to deal with flows exceeding the sewer system
Ano: 2021
Número Páginas:
14 pp..
Autor(es): David, L.; Carvalho, R.
Revista: Water
Editor: MDPI
Volume:
13,2119.
Keywords: Uncertainty; Urban drainage; Safety criteria; Flooding; Extreme rainfall; Dual drainage modelling
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Diversas opções para os principais ambientes da habitação: propostas organizativas Infohabitar # 762
No artigo desenvolve-se uma reflexão sobre o interesse da exploração e do subsequente aprofundamento de uma razoável variedade de propostas organizativas para as zonas e subzonas da habitação, numa perspetiva que encara criticamente uma, ainda preponderante, preocupação essencialmente funcional, e que visa a melhor adequação a necessidades e desejos habitacionais específicos num quadro de expressiva qualidade arquitectónica e nunca esquecendo a aplicabilidade destas ideias a soluções de habitação de interesse social, naturalmente condicionadas em termos de áreas e de acabamentos.
Ano: 2021
Número Páginas:
9p.
Autor(es): Baptista Coelho, A.
Revista: Infohabitar
Editor: GHabitar - Associação Portuguesa para a Promoção da Qualidade Habitacional (GHabitar APPQH)
Volume:
Infohabitar, Ano XVII, n.º 762.
Keywords: infohabitar; zonas da habitação; arquitectura; habitação
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Do the Volume-of-Fluid and the Two-Phase Euler Compete for Modeling a Spillway Aerator?
Spillway design is key to the effective and safe operation of dams. Typically, the flow is characterized by high velocity, high levels of turbulence, and aeration. In the last two decades, advances in computational fluid dynamics (CFD) made available several numerical tools to aid hydraulic structures engineers. The most frequent approach is to solve the Reynolds-averaged Navier
Ano: 2021
Número Páginas:
23p.
Autor(es): Mendes, L. S.; Lara, J. L.; Viseu, T.
Revista: water
Editor: MDPI
Volume:
13, 3092.
Keywords: Hydraulic structures; Volume-of-fluid; Two-phase Euler; CFD; Aeration; Spillway aerator
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Durability of epoxy adhesives and carbon fibre reinforced polymer laminates used in strengthening systems: Accelerated ageing versus Natural ageing
This work addresses the durability of structural epoxy adhesives and carbon fibre reinforcedpolymer (CFRP) laminates typically used in strengthening of existing reinforced concrete structuresexposed to natural ageing. The experimental program included four natural (real) outdoor environmentsinducing ageing mainly caused by carbonation, freeze-thaw attack, elevated temperatures, andairborne chlorides from seawater. Moreover, a control (reference) environment (20 C of temperatureand 55% of relative humidity) and an environment involving water immersion of the materials undercontrolled temperature (20 C of temperature) were also included in this investigation. The characterizationinvolved the assessment of the physical, chemical and mechanical properties along a studyperiod of up to two years. Furthermore, comparisons between the natural ageing tests developed inthe scope of the present work and accelerated ageing tests existing in the literature were performed.Regarding to the epoxy adhesives, an increase in the glass transition temperature with the time wasobserved, while the tensile properties decreased, regardless of the outdoor environment. The CFRPlaminates were marginally affected by the studied environments. Despite the remarkable dispersionof the results observed in the accelerated ageing tests for the period investigated, this testing protocolyielded higher mechanical degradation than under natural ageing.
Ano: 2021
Autor(es): J. SENA-CRUZ; Cabral-Fonseca, S.; L. CORREIA; R. CRUZ
Revista: Materials
Editor: MDPI
Volume:
14.
Keywords: artificial accelerated ageing; natural outdoor ageing; durability; CFRP laminate; epoxy adhesive
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Durability of Thermal Renders with Lightweight and Thermal Insulating Aggregates: Regranulated Expanded Cork, Silica Aerogel and Expanded Polystyrene.
Following the trend of energy-efficient construction, renders with thermal insulation properties have been studied for replacing conventional renders. However, there are still few studies on the durability of these renders that may become a barrier for their implementation. In this study, the performance of lightweight renders for thermal insulation to accelerated aging cycles and freeze/thaw cycles is discussed. For this purpose, renders with regranulated expanded cork (GEC), silica aerogel (SA), and expanded polystyrene (EPS) were produced and tested for compressive strength, ultra-sound velocity, Young
Ano: 2021
Autor(es): Soares, A.; Flores-Colen, I.; Veiga, M. R.; Gomes, M.; Morgado, A.
Revista: Gels
Editor: MDPI
Volume:
2021.
Keywords: accelerated aging cycles; freeze/thaw cycles; regranulated expanded cork; silica aerogel; expanded polystyrene; thermal render; lightweight aggregate
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Dynamic Behavior in Transition Zones and Long-Term Railway Track Performance
Transition zones between embankments and bridges or tunnels are examples of critical assets of the railway infrastructure. These locations often exhibit higher degradations rates, mostly due to the development of differential settlements, which amplify the dynamic train-track interaction, thus further accelerating the development of settlements and deteriorating track components and vehicles. Despite the technical and scientific interest in predicting the long-term behavior of transition zones, few studies have been able to develop a robust approach that could accurately simulate this complex structural response. To address this topic, this work presents a three-dimensional finite element (3D FEM) approach to simulate the long-term behavior of railway tracks at transition zones. The approach considers both plastic deformation of the ballast layer using a high-cycle strain accumulation model and the non-linearity of the dynamic vehicle-track interaction that results from the evolution of the deformed states of the track itself. The results shed some light into the behavior of transition zones and evidence the complex long-term response of this structures and its interdependency with the transient response of the train-track interaction. Aspects that are critical when assessing the performance of these systems are analyzed in detail, which might be of relevance for researchers and practitioners in the design, construction, and maintenance processes.
Ano: 2021
Número Páginas:
658909.
Autor(es): Paixão, A.; Varandas, J.; Fortunato, E.
Revista: Frontiers in Built Environment - Transportation and Transit Systems
Editor: Frontiers Media S.A.
Volume:
7.
Keywords: railway tracks; transition zones; non-linear resilient behavior; three-dimensional numerical modeling; high-cycle strain accumulation model; permanent deformation; train-track interaction
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Effect of a Submerged Vane-Field on the Flow Pattern of a Movable Bed Channel with a 90º Lateral Diversion
This laboratory study focused on the effect of a submerged vane-field on the flow patternand bed morphology near and inside the entrance reach of a movable bed 90 lateral diversion. Thesystem was modelled under live bed conditions for a water discharge ratio of 0.2. Two experimentswere run until bed equilibrium was reached: with and without a vane-field installed close to thediversion entrance to control the transfer of sediments into the diversion channel. The equilibriumbed morphology and the associated 3D flow field were measured in great detail. The bed loaddiverted into the diversion was reduced by approximately one quarter due to the action of thevane-field. The vanes prevented the formation of the diversion vortex in the main channel, upstreamof the diversion
Ano: 2021
Número Páginas:
22p.
Autor(es): Baltazar, J.; Alves, E.; Bombar, G.; Cardoso, A. H.
Revista: water
Editor: MDPI
Volume:
13, 828.
Keywords: Tip vortex; Deflection of flow; Flow separation zone; Three-dimentional flow; Submerged vanes; Bed equilibrium; Sediment transport; Diversion
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Effects of climate change and anthropogenic pressures in the water quality of a coastal lagoon (Ria Formosa, Portugal).
Resumo: Understanding how climatic and anthropogenic drivers will influence coastal lagoons is fundamental to guarantee their preservation and sustainability. The Ria Formosa (coastal lagoon, South coast of Portugal) is a very important ecosystem that supports diverse economic activities in the region. The 3D coupled hydrodynamic-biogeochemical model SCHISM was validated and used to assess the influence of climate change and anthropogenic pressures on the water quality of the Ria Formosa. Five scenarios were simulated: reference scenario (S0), mean sea level rise (SLR) of 0.5 m (S1), increase of the air temperature of 1.68 °C (S2), increase of the outflow from the wastewater treatment plants (WWTP) by 50% (S3) and a combined scenario (S4). Results suggest that SLR of 0.5 m promotes an increase of 0.5
Ano: 2021
Número Páginas:
17p.
Autor(es): Rodrigues, M.; Rosa, A.; Cravo, A.; Jacob, J.; Fortunato, A. B.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
780, 146311.
Keywords: Nutrients; Temperature; Sea level rise; Numerical modelling; SCHISM
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Effects of hygrothermal, UV and SO2 accelerated ageing on the durability of ETICS in urban environments
External Thermal Insulation Composite Systems (ETICS) have been extensively used for either new constructions or building facades retrofitting in the last decades. These systems can provide improved thermal performance to the building envelope. However, their long-term durability remains a pervasive concern, with some systems presenting relevant anomalies after few years from their application. The durability assessment of ETICS is defined by the EAD 040083-00-0404 guideline, which stated an accelerated ageing procedure based on the hygrothermal and freeze-thaw behaviour. Nevertheless, further important environmental urban conditions, such as UV radiation and atmospheric pollutants, as well as bio-susceptibility, are not envisaged in the guideline. This paper presents the results of an experimental campaign with the aim of evaluating the durability of the rendering system of several commercially available ETICS exposed to an innovative accelerated ageing procedure, which consists of hygrothermal cycles, UV radiation and air pollutants (SO2) exposure. Physical and chemical-morphological tests were carried out prior and after each ageing cycle in order to evaluate the durability of ETICS. Biological susceptibility to moulds was also assessed. The experimental results showed that both surface hardness and surface gloss decreased after the combined effect of the hygrothermal, UV, and SO2 ageing cycles, whereas an increase of surface roughness was observed. Substantial colour change for all systems after the ageing procedure was observed, confirming aesthetic alteration. Traces of biological growth were detected on the systems after ageing and the contact angle decreased after the hygrothermal cycles, indicating a lower surface hydrophobicity of the systems.
Ano: 2021
Autor(es): Parracha, J.; Borsoi, G.; Veiga, M. R.; Flores-Colen, I.; Lina Nunes; Garcia, A.; Ilharco, L.; Dionísio, A.; Faria, P.
Revista: Building and Environment
Editor: ScienceDirect
Volume:
204.
Keywords: Durability Artificial ageing procedure Surface properties Mould susceptibility Surface wettability
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