Artigos de Revista
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Artigos de Revista
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Asessing multimodal mobility trends using heterogeneous data sources: a case study for supporting sustainable mobility policy goals within the Algarve region
This paper is built around a research project developed with the support of the Regional Planning Authority of the Algarve Region in Portugal which assessed mobility patterns covering all modes of transport using heterogeneous data sources (time-series data). Data mining techniques helped to identify limitations in some data sets. The econometric analysis showed that integrated autoregressive models and moving averages for series with seasonality were successful in the prediction of passenger flows using time-series data gathered by the regional authority from transport operators and other entities. Results from the analysis are useful to support a strategy to reverse current trends on continued car growth (along with public transport decrease) and to devise policy measures to enable a sustainable mobility path towards decarbonisation and social equity goals until 2030.
Ano: 2019
Número Páginas:
12p.
Autor(es): Arsénio, E.; Silva, S.; Pereira, H.; Domingues, A.
Editor: Elsevier
Keywords: Big data; Decarbonisation; Multimodal mobility; Trend analysis; Passenger flow prediction models; Sustainable mobility
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Avaliação e mitigação dos riscos em património construído: risco sísmico, de galgamento costeiro e de incêndios florestais
O risco refere-se à probabilidade de ocorrerem danos causados pela manifestação de um determinado perigo, sendo função da perigosidade, da exposição (de pessoas e bens) e da vulnerabilidade dos elementos expostos face a esse perigo.Um componente essencial da avaliação do risco è a análise da perigosidade associada aos perigos identificados num dado território, sejam de origem natural ou decorrentes da ação humana. Outro componente essencial é a análise dos elementos (pessoas e bens) expostos aos perigos, bem como as características que contribuem para a suavulnerabilidade - ou a sua resiliência em situação de acidente grave ou de catástrofe. Nesta comunicação dá-se conta de alguns estudos desenvolvidos pelo LNEC nos domínios da avaliação da perigosidade e da vulnerabilidade sísmica das construções, da perigosidade de agitação costeira e risco de galgamentos costeiros e da avaliação da vulnerabilidade de edifícios aos incêndios florestais.
Ano: 2019
Número Páginas:
9p.
Autor(es): Cruz, H.; Fortes, C. J. E. M.; Craveiro, J.; Carvalho, A. M.
Revista: Revista Património
Editor: Direção Geral do Património Cultural, Imprensa Nacional-Casa da Moeda, S.A.
Volume:
6.
Keywords: Erosão costeira; Incêndios florestais; Galgamento oceânico; Risco
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Bairro: reverberações de uma ideia numa Lisboa em movimento
O artigo aborda a noção de bairro como um importante recurso simbólico da construção do imaginário de Lisboa na atualidade, não só confirmando a continuidade transformativa de que a cidade é uma cidade de bairros, mas também influenciando a realidade quotidiana destes lugares-bairro. Para o efeito, realiza-se uma revisitação da noção de bairro na literatura. Seguidamente exemplifica-se, através de determinados casos, alguns recursos à noção de bairro e respetiva resignificação do conceito, procurando observar algumas das problemáticas contemporâneas da cidade e, como tal, dos seus bairros.
Ano: 2019
Número Páginas:
15-26pp.
Autor(es): Menezes, M.
Revista: Cadernos do Arquivo Municipal
Editor: Câmara Municipal de Lisboa
Volume:
12.
Keywords: Cidade; Resignificação; Mudança; Continuidade; Bairro
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Caminhar como contributo metodológico do cocriar a cidade
A reflexão discute e propõe uma abordagem do ato de caminhar como método integrado e interdisciplinar para captar a experiência territorial das pessoas e, no campo do urbanismo, perspetivar a cidade. Atenta aos amplos benefícios do uso caminhado da cidade, às virtualidades do incrementar espaços caminháveis, ao caminhar como ato de resistência e assimilação estético-sensorial da cidade, o objetivo aqui é, todavia, abordar o caminhar como recurso metodológico de apreensão compreensiva, cocriativa e mais responsiva da cidade. A acuidade do caminhar advém aqui, por um lado, de um percurso etnográfico de investigação que, por outro lado, tem colaborado para insinuar sobre o interesse de uma maior ingerência didático-pedagógico que, em defesa de que se caminhe mais antes de intervir na cidade, assuma efetivamente o caminhar como um potencial método cocriativo do captar e fazer o espaço urbano.
Ano: 2019
Número Páginas:
12-19pp.
Autor(es): Menezes, M.
Revista: CES Contexto
Editor: CES-Centro de Estudos Sociais/UC-Univesidade de Coimbra
Volume:
24.
Keywords: Cocriação; Rua; Cidade; Urbanismo; Etnografia; Método; Caminhar
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CFD simulation of the aerodynamic sealing of plane jets
Abstract: Controlling air quality is of the utmost importance within today's buildings. Vertical air curtains are often used to separate two different climatic zones in order to reduce heat transfer. This research work proposes an air curtain aimed to ensure a proper separation between two zones, a clean one and a contaminated one, which is to be used together with an air extraction from the ?contaminated? compartment. A CFD parametric study was carried out in order to assess the optimal parameters for achieving the aerodynamic sealing of the air curtain. The software OpenFOAM was used to carry out the simulations. This paper presents the numerical validation of the computational fluid dynamics model for contaminant control applications and the final simulation results. Furthermore, it refers to the test results obtained in the framework of previous research, which were obtained in both small scale and full size testing, and demonstrates that the simulation results are coherent with the experiments. This research work shows that, when properly implemented, the air curtains provide the adequate aerodynamic sealing to maintain the air contaminants within the ?contaminated? compartment. The appropriate performance can be obtained for nozzle speeds as low as 1 m/s and for a nozzle thickness of 10 mm. The best performance is obtained when the extraction flowrate of the ?contaminated? compartment corresponds to the total flowrate entrained by the air curtain from the ?non-contaminated? side.
Ano: 2019
Número Páginas:
31-53pp.
Autor(es): Dias, J.; Gogotsi, O.; Viegas, J.
Revista: IOSR Journal of Engineering (IOSRJEN)
Editor: IOSR Journal of Engineering (IOSRJEN)
Volume:
Vol. 09, Issue 3.
Keywords: OpenFOAM; Air curtain; Contaminant control; Plane jets
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Combining embodied and operational energy in buildings refurbishment assessment
Buildings refurbishment is becoming a major trend in civil construction in Europe. At the same time Eu- ropean environmental and cultural commitments are being transposed to building and urban regulations. Energy efficiency and heritage safeguarding are two objectives of buildings refurbishment policies which do not always lead to the same refurbishment options. Energy efficiency assessment is not always suit- able to existing buildings in different local contexts and, while focusing on operational energy, it does not include embodied energy in buildings. This article calculates and combines embodied energy and operational energy, proposing a methodol- ogy for the assessment of building components life-cycle energy, suitable for the assessment of repairing and replacing scenarios. The methodology is applied to a case study, comparing walls repair or replace- ment and considering different scenarios of users requirements of thermal comfort. Results show the advantages of preserving building components and materials in terms of whole life cycle energy demand.
Ano: 2019
Número Páginas:
13p.
Autor(es): Mourão, J.; Gomes, R.; Matias, L.; Niza, S.
Revista: Energy & Buildings
Editor: Elsevier
Volume:
197 (2019).
Keywords: Operational embodied; Buildings refurbishment; End-of-life energy; Repair and replacement
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Comparative study of the effect of long-term ageing on the behaviour of bitumen and mastics with mineral fillers
This study aims to evaluate the effect of mineral fillers on bitumen ageing. Two different bitumens and four mastics were investigated in the unaged and long-term aged states, based on different properties (consistency, rheology, fatigue resistance and ductility). Mastics stiffened less due to ageing treatment than bitumens, especially with granite filler. However, the results of the performance tests were not definitive regarding the effect of the filler. Aged bitumen showed greater fatigue resistance and higher specific energy of ductile fracture than unaged bitumen, whereas the mastics showed minor variations in the specific energy of ductile fracture with ageing treatment, which is indicative of less ageing, but the fatigue resistance decreased significantly in mastics with one of the bitumens.
Ano: 2019
Número Páginas:
76-89pp.
Autor(es): Carl, C.; Lopes, P.; Sá-da-Costa, M.; Canon Fallaa, G.; Leischner, S.; Micaelo, R.
Revista: Construction and Building Materials
Editor: Elsevier
Volume:
225.
Keywords: Ductility fracture; Fatigue testing; Rheological properties; Ageing; Filler-bitumen interaction; Bituminous mastic
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Damage progression in rubble-mound breakwaters scale model tests, under a climate change storm sequence
This paper describes the two-dimensional (2D) physical model tests of a rock armor breakwater, performed at LNEC´s experimental facilities, under the framework of the HYDRALAB+ project. The aim of the present work was to evaluate damage evolution under future climate change scenarios, by using different damage evaluation techniques. The tested wave conditions simulated a storm sequence where two water levels (low water and high water) were considered, as well as an increase of the wave height. The water levels and the wave heights were chosen to simulate extreme events forecasted on climate change scenarios. Damage evaluation was based on the traditional counting method and on stereo-photogrammetric techniques. Test results are presented in terms of the damage parameter S and in terms of the percentage of removed armor units. The analysis is focused on the damage progression during the scale model tests, for the imposed storm sequence. The damage presents an oscillating behavior with two main damage areas corresponding to the active zones for each level, due to the variation of the water level between low-water and high-water. This behavior differs significantly from that found for the common storm sequences usually tested, where the water level does not change. Both measuring techniques lead to an intermediate damage of the cross-section breakwater. However, the damage parameter assessment with the stereo-photogrammetric technique allows a more versatile evaluation, since it is possible to characterize damage in representative zones of the cross-section
Ano: 2019
Autor(es): Fortes, C. J. E. M.; Lemos, R.; Mendonça, A. C.; Reis, M. T. L. G. V.
Revista: Journal of Research on Engineering Structures and Materials (RESM)
Editor: MIM Research Group
Volume:
Vol. 5 Iss. 4.
Keywords: Stereo-photogrammetric techniques; Climate change; Rubble-mound breakwaters; Damage progression
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Demand scenario planning approach in water distribution systems of Portugal using regression techniques
This paper aims to develop and apply an approach for short-, medium- and long-term scenario planning. Construction of water demand scenarios is of the utmost importance for planning, design and operation of distribution systems, providing useful information to promote more efficient use of water resources. The proposed approach offers a new perspective for water utilities to obtain coherent and plausible descriptive scenarios as well as realistic water demand projections. This approach was applied to network sectors in existing water distributions systems, using extensive network flow data. Descriptive scenarios for water demand, considering trends and the uncertainties of the future, were obtained, together with improved Multiple Linear Regression (MLR) models, with the inclusion of the key variable temperature and by using historical billed consumption, socio-demographic and infrastructure data. In addition, water demand projections for short- and long-term periods were obtained through the inclusion of future trends in the MLR models. Results from MLR models show enhanced empirical relations between water demand variables and water consumption key factors. This approach was validated using different distribution systems and the results have demonstrated the efficiency of the developed models for the projection of water demand.
Ano: 2019
Número Páginas:
394-411 pp..
Autor(es): Cabral , M.; Mamade, A.; Loureiro, D.; Amado, C; Covas, D.
Revista: Water Policy
Editor: IWA Publishing
Volume:
Volume 21, nº2.
Keywords: Water distribution systems; Water demand scenarios; Scenario planning; Multiple linear regression models; Demand projections
Info
Development of a Multi Criteria Decision Analysis Model for Pavement Maintenance at the Network Level: Application of the MACBETH Approach
This paper proposes the application of the MACBETH approach for the development of a multi criteria value model to enable the prioritization of maintenance and rehabilitation interventions in the pavements of road networks according to technical, economic, and social aspects. A case-study design considering the Portuguese network was undertaken to illustrate the proposed approach. Using an interactive structuring process developed with the decision-maker, a set of five evaluation criteria related to maintenance costs, traffic, pavement condition, safety, and social equity were defined. The MACBETH approach was then used to build value functions and establish relative weights for the criteria. An application of the resulting model was made to a portfolio of possible intervention projects, prioritizing them according to the principle of benefit/cost maximization. The case-study demonstrated the application of the MACBETH approach and its suitability to solve the decision-making problem, thus proving the usefulness of this approach for road agencies with pavement management responsibilities.
Ano: 2019
Número Páginas:
1-10pp.
Autor(es): Marcelino, P.; Antunes, M. L.; Fortunato, E.
Revista: Frontiers in Built Environment
Editor: Frontiers
Volume:
5.
Keywords: Pavement management system (PMS); Decision-making; Maintenance & rehabilitation; Road & highways; Prioritization algorithm; MACBETH; Multi criteria decision analysis
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