Capítulos de Livros
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Análise comparada de um agregado de escória de aciaria como material alternativo para lastro de vias férreas do tipo heavy haul por meio de ensaios triaxiais
Este artigo apresenta uma etapa de uma pesquisa mais abrangente que está em andamento na Universidade do Porto, no âmbito do grupo de pesquisa Construct-Geo, que visa avaliar os aspectos geomecânicos de materiais alternativos para uso como camada de lastro em vias férreas do tipo heavy haul. São apresentados resultados de ensaios triaxiais monotônicos e cíclicos conduzidos em corpos de prova de 150 mm de diâmetro por 300 mm de altura, em escala reduzida numa proporção de 1:2,5 em relação à granulometriade lastro padrão AREMA N. 24. Analisou-se um agregado de escória de aciaria, quimicamente e ambientalmente, inerte comparativamente a um agregado de granito, relativamente à resistência e à deformabilidade. Os ensaios cíclicos foram conduzidos em dois escalões de carga de 500.000 ciclos, sendo cada escalão compatível com o carregamento imposto por vias do tipo heavy haul com, respectivamente,32,5 toneladas/eixo e 40 toneladas/eixo. Os resultados mostraram que o lastro de escória de aciaria apresentou parâmetros de resistência superiores comparativamente ao lastro de granito e um melhor comportamento quanto à deformabilidade, expresso por maiores valores de módulo de resiliência, menoresíndices de quebra e degradação de partículas e uma maior tendência de estabilização das deformações plásticas, fenômeno conhecido como shakedown e que também foi investigado.
Ano: 2019
Número Páginas:
55-70pp..
Autor(es): Delgado, B.; Fonseca, A.; Fortunato, E.; Coelho, D.
Revista: As Engenharias frente a Sociedade, a Economia e o Meio Ambiente 3
Editor: Atena
Volume:
3.
Keywords: Ensaios Triaxiais; Escória de Aciaria; Lastro Ferroviário
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DEM modelling of the non-linear static and dynamic response of masonry structures
Discrete element models have become a major tool for masonry analysis, allowing a suitable representation of its discontinuous nature and marked nonlinear behaviour. The chapter reviews the fundamental assumptions of the main DEM formulations available. It focuses more specifically on the widely used UDEC and 3DEC codes, explaining their relation with the other approaches, and the most relevant issues arising in their application to masonry. Applications to the main types of structures are reviewed, considering both static and dynamic analyses. Recent research providing comparisons of the numerical models with experimental and field data is particularly covered. The discussion of the different examples is aimed at clarifying the key capabilities of DEM and demonstrating the most effective ways of using it in a variety of masonry analysis situations.
Ano: 2019
Número Páginas:
469-501pp.
Autor(es): Sarhosis, V.; Lemos, J. V.; Bagi, K.
Revista: Numerical Modeling of Masonry and Historical Structures - From Theory to Application
Editor: Elsevier
Keywords: DEM; Masonry structures
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Digital in action in a neighbourhood in transformation: Notes from Mouraria in Lisbon
The chapter considers the link between urban transformations in the Mouraria neighbourhood in Lisbon and the digital environment.The guiding thread of reflection is based on the tension between the production of sociocultural symbolic local references, and their (dis)appropriation by a creative economy that, relying on digital as a resource, helps to reshape the sociocultural local world into marketing. It concludes that digital has, not only a tangible social dimension, but also a tangible dimension in the processes of urban transformation. As such, it is pertinent to create alternative ways in defence of the right to the city that economize the social and its imageries taking more advantage of the articulated combination between real-digital.
Ano: 2019
Número Páginas:
24-34pp.
Autor(es): Menezes, M.
Revista: Neighbourhood & City - Between digital and analogue perspectives | Bairro & Cidade - Entre perspetivas digitais e analógicas
Editor: Edições Universitárias Lusófona
Volume:
3.
Keywords: Co-transformation; Co-creation; Transformation; Territory; Urban; Real-digitial; Imaginary; Urban image; Mouraria; Social meanings
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High-performance computing applied in project ubest
UBEST aims at improving the global understanding of present andfuture biogeochemical buffering capacity of estuaries through the developmentof Observatories, computational web-portals that integrate field observation andreal-time MPI (Message Passing Interface) numerical simulations. HPC (High-Performance Computing) is applied in Observatories to serve both on-the-flyfrontend user requests for multiple spatial analyses and to speed up backend
Ano: 2019
Número Páginas:
207-519pp.
Autor(es): Martins, R.; Rogeiro, J.; Rodrigues, M.; Fortunato, A. B.; Oliveira, A.; Azevedo, A.
Revista: Lecture Notes in Business Information Processing
Editor: Springer Nature Switzerland
Volume:
339.
Keywords: ubest; Schism; Forecasts; Parallel computing; Numerical models; Estuaries; HPC
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Opencoasts: an open-access app for sharing coastal prediction information for management and recreation
Coastal forecast systems provide coastal managers with accurate and timely hydrodynamic predictions, supporting multiple uses such as navigation, water monitoring, port operations and dredging activities. They are also useful to support recreational activities. Still, the widespread use of coastal forecasts is limited by the unavailability of open forecasts for consultation, the expertise needed to build operational forecast systems and the human and computational resources required to maintain them in operation every day. A new service for the generic deployment of forecast systems at user-specified locations was developed to address these limitations. Denoted OPENCoastS, this service builds circulation forecast systems for user-selected coastal areas and maintains them in operation using the European Open Science Cloud (EOSC) computational resources. OPENCoastS can be applied to any coastal region and has been in operation since 2018, forced by several regional and global forecasts of the atmospheric and ocean dynamics. It has attracted over 150 users from around 45 institutions across the globe. However, most users come from research institutions. The only requirement needed to use this service
Ano: 2019
Número Páginas:
794-807pp.
Autor(es): Oliveira, A.; Rodrigues, M.; Rogeiro, J.; Fortunato, A. B.; Teixeira, J.; Azevedo, A.; Lopes, P.
Revista: Computational Science-Lecture Notes-ICCS2019
Editor: Springer link
Volume:
volume 11540.
Keywords: Unstructured grids; Coastal forecasts; Open data repositories
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Seismic and Structural Health Monitoring of Dams in Portugal
This chapter is focused on the Portuguese experience on the developmentand exploration of systems for continuously monitoring dam vibrations, usingaccelerometers. The pioneer system for seismic and structural health monitoring(SSHM) installed in Cabril dam (the highest Portuguese arch dam: 132 m high) isdescribed in detail. The design of this system was the result of a long-term LNECresearch program, still ongoing. These monitoring systems should include softwaredeveloped to automatically perform the analysis of collected data, including theautomatic comparison with numerical results from 3DFE models. In view of thegood results obtained with the system in operation in Cabril dam since 2008, similarsystems have been installed in other large dams in Portugal, particularly in recentlybuilt dams. Finally, Baixo Sabor dam is presented as an example of a new Portuguesedam with a complete SSHM system, in operation since 2015. Themain experimentalresults obtained for both dams are shown, namely the evolution of natural frequenciesover time, mode shapes and the measured seismic response to earthquake events.
Ano: 2019
Número Páginas:
87-113pp..
Autor(es): Oliveira, S.; Alegre, A.
Revista: Seismic Structural Health Monitoring - From Theory to Successful Applications
Editor: Springer
Keywords: Modal identification · Concrete dams · Ambient and seismic vibrations
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Shaping favorable beliefs towards seismic protection through risk communication: A pilot-experience in two Lisbon schools (Portugal).
Communicating science within disaster risk reduction using methods that encourage two-way dialogue between scientists and laypersons is a challenging task. This paper aims at presenting a methodological strategy of communicating risk and non-structural seismic protection measures through participatory approach. Such methodological strategy is part of a pilot experience of risk communication in two schools in Lisbon (Portugal) under the EU project KnowRISK (Know your city, Reduce seISmic risK through non-structural elements). The efficacy of education for seismic safety is often inhibited by an incomplete understanding of the process by which individuals decide to protect themselves from harm (Becker JS, Paton D,Johnston DM, Ronan KR. Nat Hazards 64(1):107
Ano: 2019
Número Páginas:
445-458pp.
Autor(es): Silva, D. S.; Vicente, M.; Pereira, A.; Candeias, P.; Ferreira, M.A.; Oliveira, C.S.; Bernardo, R.; Lopes, M.; Henriques, P.
Revista: Proceedings of the International Conference on Earthquake Engineering and Structural Dynamics
Editor: Springer Link
Volume:
Volume 47.
Keywords: Non-structural; Protective behaviours; Risk communication; Seismic risk
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Towards a framework for understanding the synergies between public spaces, people and technologies
This chapter is concerned with how digital technologies are changing habits, expectations and motivations in the use of public open spaces. These digital developments are a societal challenge with reflections on social practices and, on planning and design approaches to public spaces. This might also challenge the future development of information and communication technologies (ICTs). The discussion in this Chapter is based on knowledge and experience exchanges carried out within the COST Action CyberParks. The leading issue of CyberParks is how to use ICTs to transform our cities into more human environments, rather than just more high-tech places, and to understand that smartness should be people friendly. Through the structure of the project, the importance of comprehensive and trans-disciplinary development is introduced and justified. A theoretical approach and frameworks from ethnographic and technological perspectives that help us to better understand (potential) interactions are being developed, and both are at the centre of this discussion.
Ano: 2019
Número Páginas:
2-16pp.
Autor(es): Costa, C.; Menezes, M.; Kenna, T.; FRANCO, F.
Revista: Keeping up with technologies to create the cognitive city
Editor: Cambridge Scholars Publishing
Keywords: Methodologies; Research; Digitally mediated spaces; Public open spaces; ICT
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Building a theory on co-creating a Cyberpark: lessons learnt from the COST Action CyberParks and the Flussbad Project, Berlin
The aim of this chapter is to discuss the production of mediated public open spaces by investigating the impact of ICTs in a participation process, and from this discussion to develop arguments to base a theory on co-creating a cyberpark. It focuses on how digital interconnectivity, through its potential for engaging potential users, gives rise to new forms of agency in the design of public spaces.The conceptual framework is backed by the COST-Action Cyberparks, and the Project Flussbad, both tackle the reflection of the proliferation of ICT-related media in public open spaces.
Ano: 2018
Número Páginas:
165-175pp.
Autor(es): Costa, C.; BoveleT, J.; Dolata, K.; Menezes, M.
Revista: The making of the mediated public space - Essays on emerging urban phenomena. CyberParks Project
Editor: Edições Lusófonas
Keywords: Digital habitat; Participation; Co-creation; Cyberpark; Public open spaces; ICT
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Characterization of timber masonry walls with dynamic tests
Most of the Lisbon 18th century timber-framed masonry
Ano: 2018
Número Páginas:
299-309pp.
Autor(es): Gonçalves, A.; Candeias, P.; Guerreiro, L.; Ferreira, J.; Campos Costa, A.
Revista: Historical earthquake-resistant timber framing in the mediterranean area
Editor: Springer
Volume:
Vol. 1.
Keywords: Shaking table tests; Timber-masonry walls;
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