Effect of earthquake-induced structural pounding on the floor accelerations and floor response spectra of adjacent building structures

The influence of earthquake-induced structural pounding among buildings is paramount in the seismic analysis and design of structures. The recognition of such a phenomenon has been growing in the last decades. The search for ways to understand and mitigate the consequences of these structural collisions in building structures is the primary goal of the investigation of earthquake-induced building pounding. This phenomenon is known for increasing the floor accelerations, mainly where pounding occurs, implying significant local damage. These collisions cause short-duration acceleration pulses that may compromise the building structure and the non-structural elements within the building’s stories. Non-structural elements supported by the structure’s floors under earthquake-induced pounding instances may present a risk to human lives and/or human activity. Hence, the influence of earthquake-induced pounding in the floor response spectra of two adjacent reinforced concrete structures with inelastic behavior is assessed by varying the number of stories and their separation distance. Pounding greatly influenced the floor acceleration spectra, increasing the spread of accelerations over a broader period range, particularly exciting low to moderate periods of vibration.This paper is within the scope of the first author\u2019s Ph.D. degree in progress, financially supported by the Portuguese Foundation for Science and Technology (FCT) through the PhD grant reference SFRH/BD/139570/2018, finished in April 2023, under the program POCH (N2020 \u2013 P2020) and subsidized by the European Social Fund (FSE) and national funds from MCTES. This work was financially supported by: Base Funding - UIDB/04708/2020 with DOI: 10.54499/UIDB/04708/2020 (https://doi.org/10.54499/UIDB/04708/2020) of the CONSTRUCT - Instituto de I&D em Estruturas e Constru\u00E7\u00F5es - funded by national funds through the FCT/MCTES (PIDDAC).info:eu-repo/semantics/publishedVersio

Lyntax - A grammar-Based Tool for Linguistics

This paper is focused on using the formalism of attribute grammars to create a tool that allows Linguistic teachers to construct automatically their own processors totally adapted to each linguistic exercise. The system developed, named Lyntax, is a compiler for a domain specific language which intends to enable the teacher to specify different kinds of sentence structures, and then, ask the student to test his own sentences against those structures. The processor Lyntax validates the grammar (DSL program) written by the teacher, generating a processor every time the student defines a new sentence. For that ANTLR is used in both steps, generating not only the specialized processor but also the visualization of the syntax tree for analysis purposes. An interface that supports the specification of the language was built, also allowing the use of the processor and the generation of the specific grammar, abstracting the user of any calculations

Thermo mechanic response of a ceramic material coated with gold

The present report has as the main objective to obtain, via the experimental process, the thermal response of a ceramic material coated with gold, when subjected to a variation of temperature. Under this context, the main information that it is important to be obtained consists in the calculation of the specific deformation, ε of the composite material (ceramic substrate coated with a gold top layer) that it is generated due to a temperature variation of about 100ºC. This information is of extreme importance because it imposes the adoption of specific techniques to be implemented in civil construction. It must be enhanced that the experimental activity also considered the study of the chemical composition and the morphology of the materials that were supplied by the manufacturer. In fact, this is essential information, since its knowledge helps to correlate and to interpret the thermo-mechanics response

Simulador e compilador de micro-código para processador vectorial dedicado

Tese de mestrado integrado. Engenharia Electrotécnica e de Comunicações. Telecomunicações. Universidade do Porto. Faculdade de Engenharia. 201

Organização do lugar semi-público. Reactivação do Hospital de Santa Marta em Lisboa

Dissertação para obtenção do grau de Mestre em Arquitectura

Cálculo do fluxo de harmônicos em sistemas de potência trifásicos utilizando o método de injeção de correntes com solução iterativa

This work presents a methodology, based on the current injection equations (MICT), for the calculus of the harmonic power flow in three-phase, balanced and unbalanced, electric power systems (MICTH). The developed methodology uses the Newton-Raphson method to obtain the solution of a set of non-linear equations, where the matrix system is built in a blocked form for each harmonic frequency. This mathematical approach permits to represent the interaction between harmonic components of different frequencies. It was also developed models for the main linear and non-linear devices connected to the electric power systems. The MICTH (Three-Phase Harmonic Current Injection Method) and the devices models were implemented in C++ using object-oriented and sparse-matrix programming techniques. The simulation results of the MICTH, obtained in the frequency domain, were validated with simulation results of the ATP/EMTP (Alternative Transients Program of Electromagnetic Transients Program), obtained in the time domain.Este trabalho apresenta uma metodologia, baseada nas equações de injeção de correntes (MICT), para o cálculo do fluxo de potência harmônico trifásico em sistemas elétricos equilibrados e desequilibrados (MICTH). A metodologia desenvolvida emprega o método iterativo de Newton-Raphson para obter a solução do sistema de equações não-lineares, onde o sistema matricial é formado por blocos relativos às freqüências harmônicas investigadas. Dessa maneira é possível representar as interações entre as componentes harmônicas de diferentes freqüências. Em paralelo foram desenvolvidos modelos dos principais dispositivos lineares e não-lineares conectados aos sistemas elétricos de potência. O MICTH (Método de Injeção de Correntes Trifásicas Harmônicas) e os modelos de componentes foram implementados em C++, com programação orientada a objetos, e utilizando técnicas de programação esparsa. Os resultados das simulações, no domínio da freqüência, obtidos com o programa MICTH foram validados a partir de comparações com resultados de simulações, no domínio do tempo, obtidos com o programa ATP/EMTP (Alternative Transients Program of Electromagnetic Transients Program)

A Geo-energia em Portugal – o contributo do conhecimento geológico para a transição energética

A implementação das tecnologias de armazenamento geológico de dióxido de carbono e de energia requer um conhecimento detalhado da geologia profunda das bacias sedimentares. As atividades resultantes da prospeção e pesquisa de petróleo conduzidas em Portugal permitiram o consolidar de um legado inestimável em termos de dados, informação e metodologias que constituem a principal fonte de conhecimento sobre formações geológicas da subsuperfície, tanto em áreas do onshore como do offshore. Com base neste Acervo do Petróleo, diversos projetos de investigação têm sido desenvolvidos em vários ramos das geociências. Este artigo sintetiza alguns dos resultados obtidos em projetos realizados ou em curso no âmbito da geo-energia, como o armazenamento de CO2 em diferentes ambientes geológicos, e a utilização da subsuperfície para armazenar energia nas formas química, mecânica ou térmica. Em todos esses estudos o Acervo do Petróleo foi e é ainda essencial. Acresce, porém, a necessidade de promover programas de prospeção e pesquisa em território nacional e em tempo útil, suportados na geo-energia, que contribuam para a diminuição das emissões de gases de efeito de estufa e consequente mitigação dos problemas decorrentes das alterações climáticas

Life-cycle greenhouse gas emissions of portuguese olive oil

The main goal of this paper was to assess the greenhouse gas (GHG) intensity of olive oil production in Portugal. A life-cycle model and inventory were implemented for the entire production process, including a comprehensive analysis of olive cultivation, olive oil extraction, packaging, and distribution. Data originates from five differently-sized Portuguese olive growers and from a total of six olive oil mills, representing the three extraction processes in use: three-phase extraction, two-phase extraction, and traditional pressing. The results show that the GHG intensity lies in the range 1.8-8.2 kg CO2eq/liter and that the main contributors were fertilizers (production and field emissions). Efficient use of fertilizers thus seems to be a key factor for mitigating the GHG intensity of olive oil production