Artigos de Revista

An experimental study was carried out to investigate seabed-pipeline interactions with regard to soil liquefaction. For a soil with a high proportion (30 to 60%) of fine sediment, four groups of tests were configured to reproduce soil liquefaction around pipelines for different initial pipe depths, pipe densities and wave conditions (wave height and period). The study focused on verifying the theoretically computed areas of soil failure by analyzing the sinking depths of the pipelines. The main findings are that a pipe with a submerged specific weight of less than half that of the soil will move up to the mudline; that the loss of soil loading capacity is more frequently evidenced in a fluid-like behavior of the soil than by an abrupt breaking of the soil matrix; and that the pipes which are totally buried will sink more than half-buried pipes. Moreover, wave action and the specific weight of the pipes seem to play more important roles in the expected behavior of the wave–soil–pipe interaction than the initial water content of the mud.

The integration of performance assessment may be determinant for water utilities and municipalities to improve their management practices regarding storm water systems (SWS). The use of performance assessment in the SW sector has been incipient, and the need to develop a performance assessment framework (PAF) that constitutes a reference for SWS was identified. The article aims to present a PAF, structured into eight objectives, 25 assessment criteria, and 80 performance metrics, namely performance indicators (PI), focusing on the assessment of SWS functioning, considering different performance dimensions and types of SWS. The PAF aims to promote the establishment of performance assessment systems in utilities, supporting the decision-making process and continuous improvement. The PAF was consolidated by incorporating the views and recommendations of two Portuguese water utilities during the validation process. Data collection process constitutes a barrier to the PAF application given the lack of financial and human resources in water utilities.

In recent decades, interest in the eco-efficiency of building materials has led to numerous research projects focused on the replacement of raw materials with mineral and biomass wastes, and on the production of mortars with low-energy-consuming binders, such as gypsum. In this context, five different fractions (bark, wood, branchlets, leaves, and flowers) of Acacia dealbata

No artigo aborda-se, em primeiro lugar, a importância da adaptabilidade nas novas soluções de habitar, em geral e especificamente em habitação intergeracional.Em seguida e muito ligado às matérias da adaptabilidade residencial desenvolve-se o papel da participação dos habitantes na promoção do seu bem-estar, numa dinâmica intergeracional convivial que beneficia a saúde e o respetivo meio social ; e neste sentido abordam-se as matérias do idadismo e do atual hiato intergeracional, seguindo-se uma reflexão sobre os comportamentos positivos para o bem-estar e a saúde e sobre a promoção efetiva de relações intergeracionais.Finalmente centramo-nos na relação entre idosos, habitação e Arquitetura, com uma atenção específica nas questões do desenho universal e especificamente amigo do envelhecimento e sua aplicação em termos de domesticidade e inovação tipológica.

In coastal areas, overtopping events and coastal floods, resulting from the occurrence of maritime storms, can cause severe damage to infrastructure, building and equipment, can be responsible for coastal morphology changes (coastal erosion), as well as put in damage human lives, animals or the ecosystem.

Depois de uma pequena introdução e na primeira parte do artigo desenvolve-se a temática global do que se considera ser a nova e crítica realidade social e urbana constituída pelos inúmeros idosos que vivem sozinhos.Nesta problemática abordam-se, sequencialmente, as seguintes matérias: o número cada vez maior de idosos a viverem sozinhos; o desenvolvimento de novos serviços residenciais especialmente sensíveis aos idosos; e o aprofundamento de uma nova oferta residencial para idosos baseada numa ampla perceção do envelhecimento.Na segunda parte do artigo aborda-se o tema do desenvolvimento de habitações apetecíveis para os idosos e para todos os que desejem uma nova forma de habitar intergeracional, adaptável, apoiada e participada.Nesta temática abordam-se, sequencialmente, as seguintes matérias: a noção de que uma arquitetura habitacional mais adequada e humanizada proporciona mais satisfação; as novas oportunidades oferecidas por uma habitação intergeracional; o potencial pessoal e social dos designados idosos ativos; desenvolvimento de um habitar amigo do envelhecimento; a relação entre os

The study of local scour in bridge foundations is often restricted to quantifying maximum scour depth on the upstream side. This is limiting to the understanding of the resulting scour by numerical methods, for which the shape of the scour hole is a mandatory input. In this work, two nonintrusive three-dimensional (3D) image-based measuring techniques, consisting of close-range photogrammetry and a Kinect V2 sensor, were employed to characterize the initial and final development of scour holes around piers, under steady flow in a laboratory flume. A novel two-dimensional (2D) methodology was also applied for continuous measurement of the side of the scour hole using submersible cameras. Models of the scour hole geometries in the vicinity of two oblong bridge piers were obtained at high accuracy levels. A database for calibration and validation of numerical models is thus provided.

Multilayer external wall thermal insulation systems are widely used in new constructions and for the retrofitting of building façades. Despite the increasing use as constructive solution, significant anomalies have been frequently identified on these systems only few years after their application, raising questions on their long-term durability. This paper focuses on the effects of one-year natural ageing and artificial ageing through hygrothermal cycles (heat/rain and heat/cold) on the water performance (capillary water absorption and drying kinetics), bio-susceptibility (mould development) and surface properties (colour, gloss, and roughness) of four multilayer external wall thermal insulation systems (three ETICS and a thermal rendering system). Results showed a significant loss of surface hydrophobicity after ageing. Considering the 24 h water absorption results,an increase up to 73% and 432% was obtained for the naturally and artificially aged systems, respectively, and when compared to the reference unaged systems. The drying kinetics was affected by ageing, with increases of the drying resistance ranging between 47% and 122% after artificial ageing. Traces of mould growth were observed on the artificially aged systems; however, no growth was detected on either the unaged or the one-year naturally aged systems. Substantial colour change for all systems after ageing was observed, confirming aesthetic alteration. Results contribute towards the development of implemented artificial ageing protocols, as well as for the delivery of multilayer thermal systems with enhanced performance and durability.

Multilayer external wall thermal insulation systems are widely used in new constructions and for the retrofitting of building fa‡ades. Despite the increasing use as constructive solution, significant anomalies have been frequently identified on these systems only few years after their application, raising questions on their long-term durability. This paper focuses on the effects of one-year natural ageing and artificial ageing through hygrothermal cycles (heat/rain and heat/cold) on the water performance (capillary water absorption and drying kinetics), bio-susceptibility (mould development) and surface properties (colour, gloss, and roughness) of four multilayer external wall thermal insulation systems (three ETICS and a thermal rendering system). Results showed a significant loss of surface hydrophobicity after ageing. Considering the 24ÿh water absorption results, an increase up to 73% and 432% was obtained for the naturally and artificially aged systems, respectively, and when compared to the reference unaged systems. The drying kinetics was affected by ageing, with increases of the drying resistance ranging between 47% and 122% after artificial ageing. Traces of mould growth were observed on the artificially aged systems; however, no growth was detected on either the unaged or the one-year naturally aged systems. Substantial colour change for all systems after ageing was observed, confirming aesthetic alteration. Results contribute towards the development of implemented artificial ageing protocols, as well as for the delivery of multilayer thermal systems with enhanced performance and durability.

Long motorway tunnels equipped with two independent unidirectional galleries are usually provided with longitudinal ventilation. This ventilation scheme, when applied to smoke control, can generate significant pressure differences between both roadway galleries, which may have an impact on the use of transverse galleries (escape routes). This paper present two-case studies where the results of measure- ments of these pressure differences taken in Mara ?o and Gardunha tunnels allowed the assessment of relevant flow parameters, as the pressure loss coefficient of the entrance portal, the friction factor in the tunnel and the coefficient of installation of the jet fans. The assessed parameters were used in the steady-flow energy equation for a streamtube to predict the impact of pressure differences on the protection of trans- verse galleries (emergency exits) in the case of fire. The results show that the pre- dicted pressure in the fire road gallery increases upstream the location of the fire and decreases downstream that location, when taking the pressure profile of the flow without fire as a reference. The models show that predicted pressure differences between the two road galleries in case of fire may be within the interval [200 Pa; - 100 Pa] in Mara ?o tunnel and [12 Pa; - 48 Pa] in Gardunha Tunnel, while the mea- surements in the no fire case show that they lay within the interval [29 Pa; - 50 Pa] in Mara ?o tunnel and [- 13 Pa; - 35 Pa] in Gardunha Tunnel