Papers

This contribution, based on the European research Project C3Places, focuses on co-creation of public open spaces and addresses placemaking from the perspective of adolescents. It analyses their spatial practices and needs and the co-produced ideas for a teenagers-sensitive public space. The Project results must be seen in the context of the pandemic SARS-CoV-2 which is challenging the urban fabric, placemaking and research continuity. More than ever, it is crucial to develop strategies for inclusive and responsive public spaces. This paper aims to: 1) introduce the dynamics and insights acquired in a case-study with teenage students in Lisbon; 2) review the literature related to urban planning, especially in the public space production and consumption, in the context of the global pandemic; and 3) reflect on the ontological and methodological challenges that placemaking faces as a response to call for collaborative approaches.

Flood risk management in urban areas adjacent to the coast is essential to increase their resilience. This study aims at improving scientific knowledge of flood risk alongside estuaries, considering different hazards and integrating estuestuarine and urban drainage modelling. Mathematical modelling of stormwater systems is a useful tool to evaluate the susceptibility to flooding and identify potential measures to reduce flood risk.

Several authors have proposed guidelines on how to consider the effects of oblique waves on the stability of armour layers of rubble-mound breakwaters. Especially for very oblique waves, for which the increase in stability is the largest, limited data are available. Under the scope of the HYDRALAB+ transnational access project

The paper investigates the effectiveness of two-dimensional Discrete Element Method as a tool forstructural analysis of arches provided with buttresses and backfill and strengthened with externallybonded reinforcement. Masonry vault and buttresses are modelled as an assembly of 2Drigid blocks interacting through non-linear contact joints, the backfill is discretized into deformableelastic-plastic triangular elements, while the reinforcement is modelled by means of trusselements bonded to the substrate through non-linear springs. A parametric analysis on theinfluence of material parameters and the effect of the discretization of the backfill is carriedout, and the outcome of different reinforcement systems, consisting of Steel Reinforced Groutapplied either at the intrados or at the extrados, are analysed. The comparison with experimentalfull-scale tests proved the ability of the numerical approach to capture hinges position, loadbearing capability, as well as the increase in deflection and load capacity provided by thereinforcement.

This paper describes a program under the responsibility of LNEC for the systematic observation and monitoring of maritime works that has successfully been applied to a number of maritime structures on the Portuguese mainland coast. The now-called OSOM+ program comprises the following four main components for each structure: i) periodic visual inspections by an experienced technician; ii) periodic aerial inspections with a UAV/ drone; iii) a ANOSOM-WEB database, to store and/or query obtained information on the observation campaigns, as well as to diagnose present, evolution and risk conditions of the structure; iv) a mobile, portable, application, for realtime input and visualization of the database information. OSOM+ has recently been updated with a number of tools and functionalities that are illustrated in this paper with applications to two real case studies: the Portimão harbor breakwaters and Faro-Olhão inlet entrance breakwaters, both located in the south coast of Portugal.

The uplift pressures change the stress state of the rock mass foundation in a coupled hydromechanical process and may compromise the dam stability. Consequently, dam safety regulations specify the maximum values of the hydraulic conductivity and uplift pressures that can usually only be fulfilled after the execution of seepage and uplift control measures. The design of waterproofing and drainage systems is still based on an equivalent continuum approach, even though rock mass foundations are discontinuous media. The analysis of the piezometric monitoring data of several Portuguese large concrete dam foundations reveals that uplift pressures are site-specific and may even vary considerably across a given site, which can be critical for the safety assessment. From the data gathered in several dams, a probabilistic model that can be seen as an a priori prediction model for uplift pressures is proposed. Considering the difficulty in classifying the geologic foundation conditions beneath each piezometer in existing dams, it is assumed that the data come from a mixture of two beta distributions, representing foundations with regular and unfavorable geologic conditions. This model is a significant improvement over available approaches and will be instrumental for the assessment of existing dams and the design of new dams.

Wave energy is a renewable source with significant amount in relation to the global demand. A good concept of a device applied to extract this type of energy is the onshore oscillating water column wave energy converter (OWC-WEC). This study shows a numerical analysis of the diameter determination of two types of turbines, Wells and Impulse, installed in an onshore OWC device subjected to a hypothetical sea state. Commercial software FLUENT, which is based on RANS-VoF (Reynolds Averaged Navier-Stokes equations and Volume of Fluid technique), is employed. A methodology that imposes air pressure on the chamber, considering the air compressibility effect, is used. The mathematical domain consists of a 10 m deep flume with a 10 m long and 10 m wide OWC chamber at its end (geometry is similar to that of the Pico

Electric Arc Furnace steel slag aggregate has potential for wider application in railway infrastructures. Nonetheless, its use in ballast layers, as an alternative to natural crushed rock, is often restricted, which is not consistent with the sustainable construction paradigm. To characterise the morphology and performance of this material, quantitative analyses were conducted on the abrasion and 3D morphology evolution of particles by micro-Deval testing. Slag particles showed higher angularity and surface texture indices than natural granite; retained these characteristics longer; and yielded comparable or lower surface wear. These findings support the potential use of slag aggregate as an alternative ballast material.

O artigo estrutura-se em três partes: uma primeira em que se abordam os tipos de adaptabilidade e flexibilidade habitacional e a sempre essencial relação entre família e habitação; uma segunda parte em que se desenvolvem variados tipos de soluções habitacionais em termos de

O Regulamento Geral das Edificações Urbanas (RGEU), aprovado pelo Decreto-Lei n.º 38 382, de 7 de agosto de 1951, define exigências gerais relativas à construção, saúde, segurança e estética das edificações urbanas, constituindo o diploma de cúpula da regulamentação técnica da construção.Não obstante o RGEU ter sido objeto de diversas alterações, cumprir os requisitos nele definidos, sobretudo os relativos ao dimensionamento dos espaços, coloca dificuldades nas obras em edifícios existentes. Para ultrapassar essas dificuldades foi publicada a Portaria n.º 304/2019, de 12 de setembro (doravante designada apenas de Portaria), que definiu os requisitos funcionais mínimos da habitação e da edificação em conjunto .Neste artigo analisa-se como a Portaria adequou o RGEU à especificidade das obras em edifícios existentes, comparando os requisitos funcionais estabelecidos nos dois diplomas. A exposição segue a organização da Portaria, com 4 secções e 18 artigos, e termina com algumas conclusões.