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An Early Warning System for Coastal Risks Assessment
Storms impacting sandy coastal areas produce hazards such as erosion and overwash that, in turn, promote risk to life and property damage in occupied areas. Coastal damage and risks willincrease in the future not only in association with climate change but also due to the growinghuman occupation in coastal areas (van Dongeren et al., 2018). Since the threatened coastal areas are often densely populated, there is a need to implement measures to prevent risks. One of such measures is the use of Early Warning Systems (EWS) that anticipate expected risks and, therefore, work as management tools to minimize or avoid disaster. This work presents the basis of an EWS prototype to alert about the potential consequences of overwash/overtopping and erosion induced by storms, in coastal areas.
Year: 2023
Author(s): Reis, M. T. L. G. V.; Fortes, C. J. E. M.; Zózimo, A. C.; Ferreira, A. M.; Garzon, J.L.; Ferreira, Ó.
Editor: World Scientific
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Analysis and prediction of masonry wallette strength under combined compression-bending via stochastic computational modeling
The out-of-plane flexural bending capacity of masonry is a fundamental property for understanding the behavior of masonry structures. This study investigates the behavior of unreinforced masonry wallettes subjected to combined compression-flexural loading using the discrete element method (DEM), and provides a novel framework to estimate the masonry strength. A simplified micro-modeling strategy is utilized to analyze a masonry wallette, including the variation of the mechanical properties in masonry units and joints. Stochastic DEM analyses are performed to simulate brickwork assemblages, assuming a strong unit-weak joint material model typical of most masonry buildings, including historical ones. Once the proposed computational approach is validated against the experimental findings, the effect of spatial and non-spatial variation of mechanical properties is explored. Two failure types are identified: joint failure and brick failure. For each failure mechanism, the variability of the response and the effects of the modeling parameters on the load-carrying capacity is quantified. Afterward, Lasso regression is employed to determine predictive equations in terms of the material properties and vertical pressure on the wallette. The results show that the most important parameters changing the response are the joint tensile strength and the amount of vertical stress for joint failure, whereas the unit tensile strength dominates the response for brick failure. Overall, this research proposes a novel framework adopting validated advanced computational models that feed on simple test results to generate data that is further utilized for training response prediction models for complex structures.
Year: 2023
Author(s): Erduran, E.; Tuncay, K.; Lemos, J. V.; Lourenço, P.; Pulatsu, B.; Gonen, S.
Editor: Elsevier
Keywords: Masonry
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Apoiar residencialmente um envelhecimento ativo
O presente artigo tenta abordar, de forma funcional, o conceito de
Year: 2023
Number Pages:
29p..
Author(s): Baptista Coelho, A.
: Infohabitar
Editor: Associação Portuguesa para a Promoção da Qualidade Habitacional - GHabitar APPQH
Volume:
Ano XIX, n.º 854.
Keywords: Intergeracionalidade; Habitação para idosos; Habitação intergeracional; Habitação
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Application of Bonded-Block Models to Rock Failure Analysis
Discrete element models are being increasingly applied to model rock failure processes.Bonded-particle models, based on circular or spherical particle systems, have been successfully usedfor two decades. More recently, bonded-block models, using polygonal or polyhedral elements, have proven to be a powerful alternative. This paper describes the basis of the application of these models in the numerical simulation of failure in rock materials. The critical governing parameters are identified, and their influence is discussed. The model calibration procedure based on the analysis of laboratory tests is discussed. An application example of an underground excavation problem is presented using a simple bonded-block model employing rigid blocks and a bilinear softening contact model. The results show the capability of this approach to reproduce observed failure modes involving block fractures.
Year: 2023
Author(s): Lemos, J. V.
Editor: MDPI
Keywords: rock mechanics
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Aquifer recharge capacity assessment of a anthropogenically impacted wetland by the DC resistivity geophysical method
Population growth and social and economic development demand increasing volumes of water for public supply, especially in scenarios where surface sources such as rivers may not meet the basic demands for the population. In southeastern Brazil, with emphasis on the Piracicaba region, there is a conflict over water use regarding agricultural and industrial activities, where the sugar-alcohol sector is widely highlighted. The region has thousands of hectares of sugarcane cultivated, which requires intensive use of fertilizers and pesticides, in addition to the need for large volumes of water in the production of sugar and ethanol, where the main effluent produced is represented by vinasse, used as fertilizer complement and soil hydration in sugarcane fields. This work presents the results of a geophysical diagnosis in a closed wetland, located in a sugarcane field region, to evaluate the hydrogeological function of this environment in aquifer recharge and the risks that land use can cause in the quality and availability of surface and underground water resources.The geophysical survey consisted of nine lines of electrical resistivity tomography in Schlumberger arrangement, submitted to 2D processing and inversion followed by interpolation and generation of 3D visualization models. The results indicate a direct connection between water accumulated in the wetland and the aquifer underneath, separated by an aquitard interface about 44 m thickness. The study points out to the high vulnerability to the input of pesticides and vinasse effluent from the surrounding sugarcane fields to the interior of the wetland, given the absence of riparian forest or buffer zone, in addition to the risk of contamination of surface and groundwater. Understanding the local hydrological dynamics should subsidize the sustainable use of the soil providing preservation of water resources, with emphasis on aquifers, a source of increasing importance in the face of the imminent scarcity of surface resources.
Year: 2023
Number Pages:
14p.
Author(s): Mota, R.; Masquelin, H.; Hansen, M.; Rosolen, V.; Moreira, C.A.
: Discover water
Editor: Springer
Volume:
(2023) 3:7.
Keywords: Aquifer; ERT; Geophysics; Vinasse; Sugar cane; Wetland
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Aspetos estruturantes da tipologia residencial intergeracional
Em primeiro lugar faz-se uma introdução ao presente conjunto de artigos sobre habitação intergeracional.No artigo abordam-se aspetos ligados especificamente à conceção residencial para idosos, inovação tipológica por integração de variadas funções residenciais e a realidade específica dos jovens idosos
Year: 2023
Number Pages:
14p..
Author(s): Baptista Coelho, A.
: Infohabitar
Editor: Associação Portuguesa para a Promoção da Qualidade Habitacional - GHabitar APPQH
Volume:
Ano XIX, n.º 871.
Keywords: Intergeracionalidade; Habitação para idosos; Habitação intergeracional; Habitação
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Characterization and Assessment of Performance of Innovative Lime Mortars for Conservation of Building Heritage: Paimogo
Along the Portuguese coastline, several military fortifications were built with the intentionto protect the territory from the constant military threat from the sea. These constructions have beensubjected, during centuries, to a very aggressive environment; the renders, whose main functionis the protection of walls, are particularly exposed to such actions. Nossa Senhora dos Anjos dePaimogo
Year: 2023
Number Pages:
24p.
Author(s): Santos Silva, A.; Veiga, M. R.; Lopes dos Santos, A. R.
: Applied Sciences
Editor: MDPI
Volume:
Volume 13.
Keywords: performance; mortar; lime; innovative; durability; conservation
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Characterization and assessment of performance of innovative lime mortars for conservation of building heritage: Paimogo
Along the Portuguese coastline, several military fortifications were built with the intention to protect the territory from the constant military threat from the sea. These constructions have been subjected, during centuries, to a very aggressive environment; the renders, whose main function is the protection of walls, are particularly exposed to such actions. Nossa Senhora dos Anjos de Paimogo
Year: 2023
Number Pages:
24p..
Author(s): Santos Silva, A.; Veiga, M. R.; Lopes dos Santos, A. R.
: Applied Sciences
Editor: MDPI
Volume:
13 (8).
Keywords: Performance; Mortar; Lime; Innovative; Durability; Conservation
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Characterization and Assessment of Performance of Innovative Lime Mortars for Conservation of Building Heritage: Paimogo
Along the Portuguese coastline, several military fortifications were built with the intention to protect the territory from the constant military threat from the sea. These constructions have been subjected, during centuries, to a very aggressive environment; the renders, whose main function is the protection of walls, are particularly exposed to such actions. Nossa Senhora dos Anjos de Paimogo
Year: 2023
Author(s): Santos Silva, A.; Veiga, M. R.; Lopes dos Santos, A. R.
: Applied sciences - Special Issue Innovative Construction Materials for Sustainable Heritage Conservation
Editor: MDPI
Keywords: performance; mortar; lime; innovative; durability; conservation
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Characterization of an Arundo donax-based composite: A solution to improve indoor comfort
Arundo donax (giant reed or giant cane) is a widely available, perennial, invasive, non-food crop, present worldwide and employed for several uses, including building practices. Considering the increasing demand for sustainable building materials, A. donax can be an efficient solution. This study investigated its properties as a bio-aggregate mixed with a sodium silicate solution as an adhesive. A horizontal analysis that provided a general characterization of the composite was carried out. The results showed that the A. donax-based composite had an apparent density of 517 kg/m3, thermal conductivity of 0.128 W/(m.K), and high hygroscopicity, with a moisture buffering value of 4.33 g/(m2 %RH), property that could be both an advantage for indoor comfort and a drawback. The uncommon sound absorption behaviour can be comparable to granular materials, with the highest sound absorption coefficient values,
Year: 2023
Number Pages:
18.
Author(s): Lina Nunes; D
: Industrial Crops & Products
Editor: Elsevier B.V.
Volume:
Volume 208, Número 117756.
Keywords: Mechanical properties; Hygroscopicity; Granular Material; Giant reed; Bio-waste; Acoustic absorption
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