Στην παρούσα εργασία μελετήθηκε η δυναμική συμπεριφορά μιας τυπικής σφαιρικής δεξαμενής για την εφαρμογή διάφορων συστημάτων σεισμικής προστασίας. Πέντε διαφορετικά συστήματα σεισμικής προστασίας εξετάζονται:Οι αποσβεστήρες ιξώδους απόσβεσης, οι αποσβεστήρες τριβής και οι μη-λυγίζοντες μεταλλικοί σύνδεσμοι που η λειτουργία τους βασίζεται στην κατανάλωση σεισμικής ενέργειας, και τα ελαστομερή εφέδρανα υψηλής απόσβεσης και αυτά με πυρήνα μολύβδου που η λειτουργία τους βασίζεται στην απομόνωση της βάσης της δεξαμενής. Η αριθμητική ανάλυση έγινε με την χρήση ενός λεπτομερούς μοντέλου πεπερασμένων στοιχείων που προσομοιώνει την ακριβή γεωμετρία της σφαιρικής δεξαμενής, την επίδραση του φαινομένου αλληλεπίδρασης υγρού-δεξαμενής για ενδεικτικά ποσοστά πλήρωσης, την αλληλεπίδραση εδάφους-δεξαμενής και την μη-γραμμική συμπεριφορά των συστημάτων σεισμικής προστασίας. Παρουσιάζονται αποτελέσματα της τέμνουσας δύναμης βάσης, της κατακόρυφης μετατόπισης της ελεύθερης επιφάνειας του περιεχόμενου υγρού και οριζόντιες μετατοπίσεις χαρακτηριστικών σημείων της δεξαμενής, για καθε περίπτωση συστήματος σεισμικής προστασίας υπό σεισμική διέγερση, και συγκρίνονται με τα αντίστοιχα που προκύπτουν για την σφαιρική δεξαμενή με τους συμβατούς χιαστούς συνδέσμους. / Various seismic protection systems are used to study numerically the dynamic behavior of a typical spherical liquid storage tank. Five different anti-seismic devices are investigated; nonlinear viscous dampers, buckling restrained braces and friction devices based on the passive energy dissipation technique and lead core and high damping rubber bearings based on base isolation technique. The numerical analysis is performed by means of a detailed finite element model, taking into account the exact geometry of the steel tank, the fluid-structure interaction effects for an arbitrary level of filling, the soil-structure interaction as well as the non-linearities introduced by either the dissipative bracing systems. Representative results for base shear forces, vertical displacements of the fluid content and displacements at characteristic locations of the spherical tank are presented and compared to those corresponding to a tank with a conventional bracing system.

Στην παρούσα διπλωματική εργασία γίνεται αναλυτική περιγραφή της λειτουργίας της διάταξης του Μεταγωγέα Τάσης Υπό Φορτίο ενός μετασχηματιστή υψηλής τάσης 150 kV/ 21 kV. Επίσης, περιγράφονται και αναλύονται σφάλματα που εμφανίζονται σε μετασχηματιστές με Μεταγωγέα Τάσης Υπό Φορτίο με χρήση εμπειρικών δεδομένων από την εταιρεία Δ.Ε.Η. Α.Ε. και τη θεωρητική ανάλυση και εξήγησή τους μέσα από βιβλιογραφική μελέτη . Συγκεκριμένα, περιγράφονται τα αίτια που δημιουργούν αυτά τα σφάλματα, τα συμπτώματα που εμφανίζονται στο μετασχηματιστή και το μεταγωγέα τάσης , οι επιπτώσεις των σφαλμάτων αυτών στο μετασχηματιστή και τη διάταξη του μεταγωγέα τάσης . Επιπλέον, γίνεται αναφορά στα συστήματα προστασίας που διαθέτει ο μετασχηματιστής και ο μεταγωγέας τάσης προκειμένου να προστατευθεί από τις επιπτώσεις αυτών των σφαλμάτων. Στη συνέχεια, μελετάται συγκεκριμένο σφάλμα, που παρουσιάστηκε στο Μ/Σ 150 kV/21 kV Νο1 του Υ/Σ 150 kV/21 kV των Ελληνικών Ναυπηγείων Σκαραμαγκά, και καταγράφεται η αντιμετώπισή του βήμα προς βήμα σε συνεργασία με την εταιρεία ΠΑΡΑΛΟΣ ΤΕΧΝΙΚΗ Α.Ε., στην οποία ανατέθηκε η επίλυση του σφάλματος. Τέλος, μέσα από την προσομοίωση ενός Μ/Σ υψηλής τάσης με μεταγωγέα τάσης υπό φορτίο με χρήση του λογισμικού πακέτου MatLab/SimuLink κατανοούμε σε βάθος τη λειτουργία του μεταγωγέα τάσης υπό φορτίο. Η προσομοίωση περιλαμβάνει την εφαρμογή διαταραχών της τάσης του δικτύου στο Μ/Σ στην περίπτωση ορθής και εσφαλμένης λειτουργίας του οργάνου του ρυθμιστή τάσης, καθώς η εσφαλμένη λειτουργία του ρυθμιστή τάσης ήταν και η αιτία του σφάλματος στο Μ/Σ του Υ/Σ 150 kV/21 kV των Ελληνικών Ναυπηγείων Σκαραμαγκά. / The particular project deals with the detailed description of the layout and the operation of the on load tap changer belonging to a transformer of high tension 150kV/21 kV. Furthermore, it describes and analyzes faults that occurs to transformers with on load tap changer using empirical data from DEI S.A. (Public Power Corporation) as well as theoretical analysis and explanation based on bibliography. In particular, there are described the reasons behind these faults , the symptoms that appear to the transformer and the tap changer and the consequences to the transformer and the layout of the tap changer. Moreover, there is reference to the protection systems that the transformer and the tap changer have in order to be protected from the consequences of the faults. Further on, a particular troubleshooting is studied that occurred at the transformer 150 kV/21 kV no1 of the high voltage substation 150 kV/21 kV at the Hellenic Shipyards of Skaramagas and its handling is reported step by step in association with PARALOS TECHNICAL S.A. , the company which was assigned to solve the troubleshooting. Finally, the operation of the on load tap changer is studied in depth through simulation of a high voltage transformer with on load tap changer using MatLab/SimuLink software package. The simulation includes the application of voltage variations at the transformer, occurred to the high voltage network in the case of orderly or disorderly operation of the voltage regulator, as the faulty operation of the voltage regulator was the reason behind the troubleshooting of the transformer of the substation of 150 kV/ 21 kV at the Hellenic Shipyards of Skaramagas.

Na indústria da construção, as quedas de altura constituem-se em um dos tipos mais frequentes de acidentes graves. Alguns fatores contribuem para essas quedas, entre os quais se destacam a falta de qualificação dos trabalhadores, restrições de leiaute e a falta de barreiras de proteção contra quedas. Embora o uso de sistemas temporários de proteção periférica (SPP) seja uma medida importante para prevenir as quedas de altura em canteiros de obras, a literatura não apresenta um conjunto abrangente de requisitos para esses sistemas. As normas de segurança e saúde no trabalho na construção civil, tanto no Brasil como no exterior, apresentam vários requisitos aos quais os SPP devem atender. Contudo, a maioria destes requisitos são relacionados somente à resistência estrutural e à configuração geométrica, negligenciando a eficiência e flexibilidade dos mesmos, bem como não tratam dos processos de montagem e desmontagem. As limitações nos requisitos considerados em diversas fontes e a falta de métodos para verificar a conformidade dos SPP aos requisitos das normas (e outros requisitos relevantes) criam dificuldades para as partes interessadas, tais como órgãos governamentais de fiscalização, empresas construtoras, e os próprios operários encarregados pela execução dos SPP. O objetivo deste trabalho é propor um conjunto de requisitos de desempenho para sistemas temporários de proteção periférica. Estes requisitos foram identificados a partir de várias fontes de evidencia, tais como regulamentos, observações diretas de operações de montagem e desmontagem dos SPP em obras, análise de projetos de SPP, e entrevistas com especialistas. Deste modo, foi identificado um conjunto de 33 requisitos: 15 relativos à segurança, 12 à eficiência e 6 à flexibilidade. Com base nos referidos requisitos, foram avaliados 9 tipos de SPP, em 26 canteiros de obra. Estes SPP foram agrupados em três categorias de acordo com os materiais constituintes: metálicos, madeira e mistos. As principais contribuições deste estudo referem-se ao desenvolvimento de um conjunto amplo de requisitos, à análise das relações entre estes requisitos, indicando se estes podem reforçar-se mutuamente ou estar em conflito, e a proposição de um protocolo que torna claro as premissas adotadas em cada etapa da avaliação. / In the construction industry falls from height are one of the most frequent types of serious accidents. There are a number of factors that contribute for such falls, such as the lack of training for workers, layout constraints, and the lack of fall protection barriers. Although the use of temporary edge protection systems (TEPS) is an important measure to prevent falls from height in construction sites, the literature does not present a comprehensive set of requirements for those systems. Safety and health standards in construction, both in Brazil and abroad, have several requirements to which the SPP should meet. However, most of those standards are limited to structural strength and geometric configuration requirements, neglecting efficiency and flexibility, as well as do not address the assembly and disassembly processes. The limitations of requirements considered in several sources, and the lack of methods to verify the conformance of TEPS to the requirements established in standards (and other relevant requirements) create difficulties for stakeholders, such as government supervisory bodies, construction companies, and the workforce involved in the installation of TEPS. The aim of this study is to propose a set of performance requirements for temporary edge protection systems. These requirements have been identified from various sources, such as standards, direct observation od assembly and disassembly operations, analysis of TEPS design, and interviews with specialists. Thus, a set of 33 requirements were identified: 15 related to safety, 12 to efficiency and 6 to flexibility. Based on those requirements 9 TEPS solutions were evaluated in 26 construction sites. Those solutions were divided into three categories according to the materials used: metal, wood and mixed. The main contributions of this investigation refers to the development of a broad set of requirements, the analysis of the relationships between those requirements, indicating that these can either reinforce each other or be in conflict, and the proposal of a protocol that makes it clear the assumptions made at each evaluation stage.

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Na indústria da construção, as quedas de altura constituem-se em um dos tipos mais frequentes de acidentes graves. Alguns fatores contribuem para essas quedas, entre os quais se destacam a falta de qualificação dos trabalhadores, restrições de leiaute e a falta de barreiras de proteção contra quedas. Embora o uso de sistemas temporários de proteção periférica (SPP) seja uma medida importante para prevenir as quedas de altura em canteiros de obras, a literatura não apresenta um conjunto abrangente de requisitos para esses sistemas. As normas de segurança e saúde no trabalho na construção civil, tanto no Brasil como no exterior, apresentam vários requisitos aos quais os SPP devem atender. Contudo, a maioria destes requisitos são relacionados somente à resistência estrutural e à configuração geométrica, negligenciando a eficiência e flexibilidade dos mesmos, bem como não tratam dos processos de montagem e desmontagem. As limitações nos requisitos considerados em diversas fontes e a falta de métodos para verificar a conformidade dos SPP aos requisitos das normas (e outros requisitos relevantes) criam dificuldades para as partes interessadas, tais como órgãos governamentais de fiscalização, empresas construtoras, e os próprios operários encarregados pela execução dos SPP. O objetivo deste trabalho é propor um conjunto de requisitos de desempenho para sistemas temporários de proteção periférica. Estes requisitos foram identificados a partir de várias fontes de evidencia, tais como regulamentos, observações diretas de operações de montagem e desmontagem dos SPP em obras, análise de projetos de SPP, e entrevistas com especialistas. Deste modo, foi identificado um conjunto de 33 requisitos: 15 relativos à segurança, 12 à eficiência e 6 à flexibilidade. Com base nos referidos requisitos, foram avaliados 9 tipos de SPP, em 26 canteiros de obra. Estes SPP foram agrupados em três categorias de acordo com os materiais constituintes: metálicos, madeira e mistos. As principais contribuições deste estudo referem-se ao desenvolvimento de um conjunto amplo de requisitos, à análise das relações entre estes requisitos, indicando se estes podem reforçar-se mutuamente ou estar em conflito, e a proposição de um protocolo que torna claro as premissas adotadas em cada etapa da avaliação. / In the construction industry falls from height are one of the most frequent types of serious accidents. There are a number of factors that contribute for such falls, such as the lack of training for workers, layout constraints, and the lack of fall protection barriers. Although the use of temporary edge protection systems (TEPS) is an important measure to prevent falls from height in construction sites, the literature does not present a comprehensive set of requirements for those systems. Safety and health standards in construction, both in Brazil and abroad, have several requirements to which the SPP should meet. However, most of those standards are limited to structural strength and geometric configuration requirements, neglecting efficiency and flexibility, as well as do not address the assembly and disassembly processes. The limitations of requirements considered in several sources, and the lack of methods to verify the conformance of TEPS to the requirements established in standards (and other relevant requirements) create difficulties for stakeholders, such as government supervisory bodies, construction companies, and the workforce involved in the installation of TEPS. The aim of this study is to propose a set of performance requirements for temporary edge protection systems. These requirements have been identified from various sources, such as standards, direct observation od assembly and disassembly operations, analysis of TEPS design, and interviews with specialists. Thus, a set of 33 requirements were identified: 15 related to safety, 12 to efficiency and 6 to flexibility. Based on those requirements 9 TEPS solutions were evaluated in 26 construction sites. Those solutions were divided into three categories according to the materials used: metal, wood and mixed. The main contributions of this investigation refers to the development of a broad set of requirements, the analysis of the relationships between those requirements, indicating that these can either reinforce each other or be in conflict, and the proposal of a protocol that makes it clear the assumptions made at each evaluation stage.

Made available in DSpace on 2014-10-09T12:50:25Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:58:44Z (GMT). No. of bitstreams: 1 10895.pdf: 9491478 bytes, checksum: a17089904688d31b0c3d8e9056a263b2 (MD5) / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

Orientador: Walmir de Freitas Filho / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-09T14:02:58Z (GMT). No. of bitstreams: 1 Salles_NewtonJosede_M.pdf: 3608719 bytes, checksum: b040f49f75941ae11cb16f7beb51b76d (MD5) Previous issue date: 2007 / Resumo: A necessidade de desenvolvimento de modelos dinâmicos para estudos de sistemas de proteção de redes de distribuição de energia elétrica tem sido acentuada, recentemente, devido ao grande número de geradores síncronos que estão sendo conectados nestas redes. Assim, o objetivo desta dissertação de mestrado é desenvolver uma biblioteca de modelos dinâmicos para representar os principais relés empregados em sistemas de proteção de redes de distribuição e subtransmissão de energia elétrica na presença de geradores síncronos. Os modelos desenvolvidos são adequados para utilização juntamente com programas de simulação de transitórios eletromagnéticos de sistemas de potência (simulação com realimentação ? close loop), para verificar a influência do sistema de proteção no desempenho da rede, ou independentemente (simulação sem realimentação - open loop), para investigar os algoritmos empregados no relé ou para validar os modelos desenvolvidos. A complexidade adotada para representar os diversos tipos de relés foi decidida tendo-se em mente que tais modelos devem ser precisos o suficiente para desenvolvimento de pesquisas na área de proteção de sistemas de distribuição na presença de geradores síncronos e simples o suficiente para que eles possam ser utilizados para ensino da teoria de sistemas de proteção de redes de distribuição em nível de graduação e pós-graduação. Os modelos foram desenvolvidos para uso no ambiente Matlab/Simulink. Conseqüentemente, estes modelos podem ser utilizados com diversos programas de simulação de transitórios eletromagnéticos tais como o PSCAD/EMTDC, o SimPowerSystems e o ATP. Os modelos desenvolvidos foram validados através da comparação dos resultados obtidos por simulação com o comportamento real de relés comerciais. Adicionalmente, tal validação dos modelos foi realizada através de duas metodologias. Na primeira metodologia, dados obtidos em campo através de oscilografias de relés foram utilizados como entrada para os modelos desenvolvidos. Então, o comportamento do relé comercial foi comparado com o comportamento do modelo simulado. Na segunda metodologia, os dados de tensão e corrente foram gerados através de simulações de transitórios eletromagnéticos utilizando-se o ATP. Então, tais dados foram utilizados para verificar o comportamento de um relé comercial, através do uso de caixa de teste, e do relé simulado. Os resultados comprovam que os modelos desenvolvidos são suficientemente precisos para determinar o comportamento de relés comerciais operando em campo / Abstract: Recently, the need for the development of protection device dynamic models for analysis of distribution network protection systems has increased due to the usage of distributed generators. Therefore, the objective of this dissertation is to develop a dynamic model library torepresent the main relays used in the subtransmission and distribution network protection systems in the presence of synchronous generators. The developed models can be used with transient electromagnetic programs (close loop), in order to analyze the influence of the protection system on the network performance, or individually (open loop), in order to investigate new algorithms as well as to validate the models. The developed models are sufficiently detailed to conduct researches on distribution network protection in the presence of distributed generators, however, in the same time, they are simple enough to be used to teach undergraduate and graduate students. The models were developed to use with Matlab/Simulink. As a result, they can be used with several electromagnetic transient programs such as PSCAD/EMTDC, SimPowerSystems, and ATP. The developed models were validated by comparing the results obtained through simulation with the performance of real, commercial relays. Moreover, two approaches were used to validate the models. In the first one, field data obtained from relay oscillograms were used as an input to the developed models. Then, the commercial relay behavior was compared with simulated relay. In the second approach, voltage and current signals were generated by using the ATP. Then, these signals were used to verify the behavior of the commercial relays, through an amplifier, and of the developed model. The results show that the developed models are accurate enough to determine the behavior of commercial relays / Mestrado / Energia Eletrica / Mestre em Engenharia Elétrica

Submitted by Cássia Santos (cassia.bcufg@gmail.com) on 2016-12-16T12:38:56Z No. of bitstreams: 2 Dissertação - Rafael da Silva Ferraz - 2016.pdf: 8992095 bytes, checksum: 11544acef63b20e945753d7b895bb5ae (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Jaqueline Silva (jtas29@gmail.com) on 2016-12-16T16:57:34Z (GMT) No. of bitstreams: 2 Dissertação - Rafael da Silva Ferraz - 2016.pdf: 8992095 bytes, checksum: 11544acef63b20e945753d7b895bb5ae (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2016-12-16T16:57:34Z (GMT). No. of bitstreams: 2 Dissertação - Rafael da Silva Ferraz - 2016.pdf: 8992095 bytes, checksum: 11544acef63b20e945753d7b895bb5ae (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2016-11-04 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This work presents the project and the implementation of a device that is capable of measuring the electrical effects, especially the impedance, in grounding meshes when subjected to atmospherical discharges. An analysis on the influence of the atmospheric discharges in electrical protection systems is performed and also a comparison between current and voltage impulsive circuits. The device is built of electronic circuits controlled by a microcontroller, with the possibility of parameter adjusting for shaping the generated impulse wave. The device was conceived such that it can be used for tests of soil impedance measurement and for verification of the behavior of electrical grounding systems under high frequencies. The results are presented for tests in different types of systems and there was satisfactory performance for the developed equipment when compared with a commercial device / Este trabalho apresenta o projeto e a implementação do dispositivo capaz de medir os efeitos elétricos, em especial, as impedâncias, em malha de aterramento, sujeito a descargas atmosféricas. Analisa-se as influências das descargas atmosféricas nos sistemas de proteção elétricos e desenvolve-se análise comparativa dos circuitos impulsivos de corrente e de tensão. Constrói-se o dispositivo que consiste de circuitos eletrônicos controlados por microcontrolador, com possibilidade de ajuste de parâmetros da onda gerada. O dispositivo produzido é utilizado para medição da impedância do solo e verificação do comportamento de sistemas de aterramento elétrico em baixas e altas frequências. São apresentados os resultados dos testes em diferentes tipos de sistemas, demonstrando o satisfatório desempenho quando comparado com instrumento comercial.

L'arrivée de la globalisation a révélé l'existence de deux crises. La crise de l'État-nation et la crise du droit international. Ces crises sont devenues plus aigües à cause des nouveaux problèmes de l'humanité. Problèmes qui échappent tant au contrôle de l’État qu’à la régulation du droit international interétatique. Face à cette problématique, il est apparu le droit global, qui prétend substituer le droit international, en supprimant les Nations Unies, à travers la création d’une nouvelle organisation internationale dénommée : l’humanité unie. Afin de sauver le droit international ainsi que d’éviter les conséquences nuisibles qui pourrait porter le droit global à la communauté internationale, il est proposé la création d’un nouveau droit, le droit international humaniste, fondé sur la protection des intérêts des personnes et de l’humanité. Pour faire effectif le droit international humaniste, il est proposé le concept d’État-outil ainsi que la mise en œuvre du contrôle de conventionnalité, dans le but d’harmoniser les droits étatiques avec la régulation humaniste. / The arrival of the globalization revealed the existence of two crises. The crisis of the nation state and the crisis of the international law. These crises became more acute because of the new problems of the humanity. Problems which escape both the control of the State and the regulation of the interstate international law. In the face of this problem, it appeared the global law, which claims to substitute the international law, by eliminating the United Nations, through the creation of a new international organization: The United Humanity. To save the international law as well as avoid the harmful consequences who could wear the global law for the international community, is proposed the creation of a new law, the international law for humankind, based on the protection of the interests of the people and the humanity. To make staff the international law for humankind, is proposed the concept of Tool- State as well as the implementation of the conventionality control, with the aim of harmonizing the state rights with the humanist regulation.

Nous nous intéressons aux méthodes de contrôle de vibrations de modèles réduits de structures à n degrés de liberté, sismiquement isolées au niveau de la base par des systèmes d'isolation mixte.Le mouvement provoqué par une sollicitation sismique horizontale a lieu dans le plan vertical.Nous avons construit un problème de contrôle semi-actif de systèmes incertains soumis à des perturbations inconnues, mais bornées. Dans le langage de l'automatique, il s'agit d'un problème d'atténuation de perturbations.Le résultat principal de cette thèse porte sur la construction d'une version modifiée des résultats de Leitmann et de ses collaborateurs sur la stabilisation de systèmes non linéaires incertains. Le théorème proposé repose sur une loi de commande par retour d'état qui assure en boucle fermée les propriétés de "uniform boundedness" et "uniform ultimate boundedness".En particulier, il peut être appliqué à la résolution de problèmes de contrôle semi-actif, qui sont actuellement traités en génie parasismique.L'objectif du contrôle est d'améliorer le comportement (i.e. la réponse) de structures isolées pour faire face aux perturbations externes, c'est-à-dire les séismes. Plusieurs points différencient notre problème de la majorité que l'on trouve dans la littérature: (i) on ne s'intéresse pas seulement à la protection de la structure isolée, mais aussi aux équipements situés à l'intérieur de la structure, et (ii) au lieu d'utiliser des indicateurs de performance habituels exprimés en termes de déplacement relatif de la base versus des accélérations absolues des planchers, nous utilisons uniquement le spectre de plancher en pseudo-accélération, comme il a été proposé dans des travaux précédents par Politopoulos et Pham. Ce travail est une tentative d'utiliser explicitement les spectres de plancher comme critère de performance.Concernant la procédure d'application, plusieurs étapes intermédiaires ont été détaillées:(i) modélisation de signaux sismiques;(ii) réglage des paramètres de la loi de commande utilisant la théorie des vibrations;(iii) validation et test du comportement en boucle fermée à travers des simulations numériques: pour des raisons de simplicité, on se limite au cas n=2.Cette procédure peut être utilisée sur des structures en industrie nucléaire, mais aussi en génie civil.D'autres sujets traités incluent une tentative d'utiliser les outils temps-fréquence, et en particulier la distribution de Wigner-Ville, pour la synthèse de lois de commande, en espérant pouvoir mieux contrôler les composants transitoires des signaux de perturbation (les entrées) et des variables d'état (les sorties). / Vibration attenuation control designs are proposed for reduced plant models consisting of n-degree-of-freedom base seismically-isolated structures (i.e., a specific type of earthquake-resistant design), modeled by uncertain nonlinear systems and subjected to one-dimensional horizontal ground acceleration (i.e. the earthquake signal), treated as unknown disturbance but assumed to be bounded.In control systems literature, this is a perturbation attenuation problem.The main result of this PhD is the development of a modified version of Leitmann and co-authors' classical result on the stabilization of uncertain nonlinear systems. The proposed theorem consists of a bounded nonlinear feedback control law that is capable of ensuring uniform boundedness and uniform ultimate boundedness in closed-loop. In particular, it can be applied to solving semi-active control design problems, which are currently dealt with in earthquake engineering.The control objective is to improve the behavior (i.e. response) of mixed base-isolated structures to external disturbance, namely earthquakes. What differentiates our problem from the majority to be found in the literature is that: (i) attention is being paid to the protection of equipment placed inside the structure an not only to the structure itself; (ii) instead of using regular performance indicators expressed in terms of relative base displacement versus floors accelerations, we use solely the pseudo-acceleration floor response spectra, as it was proposed in previous recent works by Politopoulos and Pham.Actually, this work is an attempt to explicitly use floor response spectra as performance criterion.Concerning the application procedure, some of the topics that were detailed are:(i) modeling of earthquake signals;(ii) tuning of control law parameters based on vibration theory;(iii) validation and testing of the closed-loop behavior using numerical simulations: for simplicity reasons, we take n=2.This procedure can be used on structures of both nuclear industry as well as civil engineering.Other topics include an attempt to using time-frequency concepts and in particular the Wigner-Ville distribution to the control law design procedure, in order to better control transitory components of both perturbation (the input) and state variables signals (the output).