Wind loads acting on wooden building structures need to be dealt with adequately in order to ensure that neither the serviceability limit state nor the ultimate limit state is exceeded. For the structural designer of tall buildings, avoiding the possibly serious consequences of heavy wind loading while taking account at the same time of the effects of gravitation can be a real challenge. Wind loads are usually no major problem for low buildings, such as one- to two-storey timber structures involving ordinary walls made by nailing or screwing sheets of various types to the frame, but when taller structures are designed and built, serious problems may arise. Since wind speed and thus wind pressure increases with height above the ground and the shear forces transmitted by the walls increase accordingly, storey by storey, considerable efforts can be needed to handle the strong horizontal shear forces that are exerted on the bottom floor in particular. The strong uplift forces that can develop on the wind side of a structure are yet another matter that can be critical. Accordingly, a structure needs to be anchored to the substrate or to the ground by connections that are properly designed. Since the calculated uplift forces depend very much upon the models employed, the choice of models and simplifications in the analysis that are undertaken also need to be considered carefully. The present licentiate thesis addresses questions of how wind loads acting on multi-storey timber buildings can be best dealt with and calculated for in the structural design of such buildings. The conventional use of sheathing either nailed or screwed to a timber framework is considered, together with other methods of stabilizing timber structures. Alternative ways of using solid timber elements for stabilization are also of special interest. The finite element method was employed in simulating the structural behaviour of stabilizing units. A study was carried out of walls in which sheathing was nailed onto a timber frame. Different structural levels were involved, extending from modelling the performance of a single fastener and of the connection of the sheathing to frame, to the use of models of this sort for studying the overall structural behaviour of wall elements that possess a stabilizing function. The results of models used for simulating different load cases for walls agreed reasonably well with experimental test results. The structural properties of the fasteners binding the sheathing to the frame, as well as of the connections between the members of the frame were shown to have a strong effect on the simulated behaviour of shear wall units. Regarding solid wall panels, it was concluded that walls with a high level of both stiffness and strength can be produced by use of such panels, and also that the connections between the solid wall panels can be designed in such a way that the shear forces involved are effectively transmitted from one panel to the next.

Ce travail de thèse porte sur l'étude de l'influence des micro-perforations sur la réponse vibratoire d'une structure cellulaire de type panneau sandwich NIDA (nid d'abeille). Les réflecteurs d'antenne de satellites placés sur les satellites de télécommunication, comme beaucoup d'autres éléments, sont fabriqués avec ce type de matériaux. Lors du décollage du lanceur pour la mise en orbite du satellite, les sollicitations mécaniques appliquées au système sont de nature acoustique et solidienne. La sollicitation acoustique liée au champ acoustique diffus et de très fort niveau présent dans la coiffe du lanceur est la plus importante. Elle joue un rôle important dans le dimensionnement et la conception du réflecteur d'antenne. L'enjeu de la thèse est d'évaluer le potentiel d'un traitement de ce panneau par micro-perforations pour en réduire les vibrations. L'effet des micro-perforations sur la réponse vibratoire du réflecteur d'antenne est double. D'une part, le chargement acoustique que constitue la pression excitatrice est réduit par un mécanisme d'absorption du à la présence des micro-perforations, couplées aux cavités formées par les cellules NIDA du matériau. Cet effet, connu dans la littérature est décrit notamment par le modèle d'impédance acoustique de D.-Y. Maa, couplé à un modèle d'impédance de la cavité NIDA et prenant en compte les rayonnements interne et externe à la micro-perforation. D'autre part, un effet, de nature vibro-acoustique est induit par le couplage entre les vibrations du panneau et les mouvements acoustiques dans les micro-perforations. La modélisation de cet effet, mal décrit dans la littérature constitue un élément original du travail : un modèle discret construit à partir de l'impédance acoustique d'un orifice permet le calcul d'une force d'amortissement élémentaire, puis, après homogénéisation, à une estimation de l'amortissement modal du panneau micro-perforé. Les modélisations proposées pour la réduction de chargement acoustique et de l'amortissement ajouté par micro-perforation montrent que la réponse vibratoire du panneau est faiblement réduite dans la plage de fréquence d'intérêt, ce que confirment plusieurs tests expérimentaux : comparaison de réponse de panneau micro-perforé ou non en chambre réverbérante et en chambre à bruit. La modification de chargement acoustique apportée par la micro-perforation des deux faces du panneau sandwich NIDA est modélisée dans le dernier chapitre et donne lieu à une augmentation de l'effet dans la gamme de fréquence visée. / This thesis work is about the study of the microperforations influence on the vibratory response of a cellular structure as a honeycomb sandwich panel. Satellites' antenna's reflectors placed on telecommunication satellites, as many satellites' elements, are manufactured in this kind of materials. During the launcher take-off for putting satellite into orbit, the mechanical stresses applied to the system are acoustical and vibration borne stress. The acoustic stress, linked to the high level diffuse acoustic field inside the launcher fairing is the most important. It plays a part in the antenna's reflector size and conception. The issue of the thesis is to evaluate the potential of a treatment using microperforations on this panel in order to reduce its vibration. The microperforations effect on the vibration response of the antenna's reflector is double. On one hand, the acoustic loading applied by the exciter pressure is reduced by an absorption mechanism due to the presence of microperforations, coupled to cavities formed by honeycomb cells. This effect, well known in the litterature, is for instance described by the acoustic impedance model developped by D.-Y. Maa, coupled to an impedance model of honeycomb cavity and taking into account the inner and outer radiations of the microperforation. On the other hand, a vibro-acoustical effect is induced by the coupling between panel vibrations and acoustic movements inside microperforations. The modelling of this effect, not well described in the litterature, constitutes an original element of the thesis work: a discrete model constructed using the acoustic impedance of an orifice, allows the computation of an elementary damping force and then leads, after an homogenisation, to an estimation of the modal damping of the microperforated panel. Both modellings proposed for the acoustic loading reduction and the damping added by microperforations, show that the panel vibration response is weakly reduced in the frequency band of interest, which confirms experimental tests like: response comparison of non microperforated and microperforated panels placed in reverberant room and noise chamber. The acoustic loading modification induced by the microperforation of both sides of the honeycomb sandwich panel is modelling in the thesis last chapter and allows an increase of the effect on the frequency band aimed.

Diploma work analyzes the collective systems which are solving the disposal of photovoltaic's panels, classified as electrical equipment subject to recollection since last year, and tries to get answer to question if the collective systems should ensure a smooth disposal. Biggest wave of disposal photovoltaic's panels is expected in the next 15 -- 20 years. Operators and manufacturers have a statutory obligation to pay a fee, for every kilogram of photovoltaic's panels.The question under consideration is the check of the collective systems setting and also, comparative analysis of collective systems which are dealing with disposal of photovoltaic's panels and other electrical equipment. Furthermore, the survey conducted and processed according to the conclusions of the various groups (collective systems operators, operators of PV plants, lawmakers, and public) and also, the analysis of systems is presented.

Submitted by Jakeline Ortega (jakortega@unoeste.br) on 2018-09-21T18:11:45Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Jacqueline Roberta Tamashiro - resumo.pdf: 51113 bytes, checksum: 54bab18aa252772921b9b51e3a002aec (MD5) / Made available in DSpace on 2018-09-21T18:11:45Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Jacqueline Roberta Tamashiro - resumo.pdf: 51113 bytes, checksum: 54bab18aa252772921b9b51e3a002aec (MD5) Previous issue date: 2018-04-06 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The process of industrialization, population growth and globalization have led, over the decades, to the increase of industrial activities and intensive and mechanized agriculture, which consequently triggered in disorderly urbanization and increased consumption. These demands have generated until the present day, numerous environmental problems, ranging from the exploratory extraction of natural resources, many of them almost extinct, to the disposal of the residues generated by the manufactured products. This scenario has its aggravating, irregular accumulation of this waste. The construction industry uses non-renewable raw materials in abundance, consuming a large amount of energy in the extraction of inputs, in the production of materials and in the transportation of both. Appropriate treatment and recycling of the generated waste may be the most viable to stop the exploration of degraded areas caused by the disordered extraction. This research aims at the mechanical fabrication and characterization of recycled concrete prototypes and precast concrete panels from Presidente Prudente, and vinasse, a by-product of a sugar and alcohol mills in the Western Region of the State of São Paulo. The methodological process involves the sampling of the recycled concrete aggregate (RCA) and the characterization of the raw material (RCA, cement, sand and gravel) using grain size distribution, grains form, specific mass, water absorption and swelling tests. In sequence, the step manufacturing different traits reproduced in many lots of samples, as well as the physical characterization of the fresh mass by the slump test; setting time of paste (Vicat), pH value and the physical characterization of the test specimens through resistance to mechanical compression strength and mass monitoring. Subsequently, it follows the stage of the manufacture of new test specimens of the trace that presented better results in the previous stage. This trait was physically characterized by porosity; (X-Ray Diffraction (XRD), Fourier Transform Infrared Absorption, Attenuated Total Reflectance (ATR-FTIR)), optical microscopy, Scanning Electron Microscopy (SEM). Finally, the last step involved the fabrication of the prototype of the precast concrete panels and the physical tests (mass monitoring, strength of the surface hardness by the sclerometer and flexural tensile strength in a prismatic prototype). The results indicate the feasibility of use as a constructive material, they also indicate the possibility of minimizing the environmental impacts, by reusing them within the civil construction cycle. / O processo de industrialização, o crescimento populacional e a globalização acarretaram, ao longo das décadas, no aumento das atividades industriais e na agricultura intensiva e mecanizada, que por consequência, desencadearam na urbanização desordenada e no maior consumo. Tais demandas geraram até os dias atuais inúmeros problemas ambientais, que envolvem desde a extração exploratória de recursos naturais, muitos dos quais quase extintos, até o descarte dos resíduos gerados pelos produtos fabricados. Este cenário tem seu agravante, o acúmulo irregular destes resíduos. A indústria da construção civil utiliza em abundância matéria-prima não renovável, consome grande quantidade de energia na extração de insumos, na produção de materiais e no transporte de ambos. O tratamento adequado e a reciclagem dos resíduos gerados pode ser o meio mais viável para cessar a exploração de áreas degradadas provocadas pela extração desordenada. Esta pesquisa visa a fabricação e caracterização mecânica de protótipos e placas pré-moldadas de concreto reciclado do descarte de obras da construção civil, de Presidente Prudente e, vinhaça, subproduto de uma usina de açúcar e álcool da Região Oeste do Estado de São Paulo. O processo metodológico contempla a amostragem do agregado de resíduo de concreto (ARC) e a caraterização da matéria-prima (ARC, cimento, areia e brita basáltica) através das técnicas de granulometria, formato dos grãos, massa específica, absorção de água e ensaio de inchamento. Em sequência, a etapa fabricação de diferentes traços reproduzidos em lotes de corpos de prova, bem como a caracterização física da massa fresca pelas técnicas de consistência e abatimento (slump test); tempo de pega da pasta (Vicat) e potencial hidrogeniônico (pH) e a caracterização física dos corpos de prova via resistência à compressão mecânica e monitoramento da massa. Posteriormente, segue a etapa da fabricação de novos corpos de prova do traço que apresentou melhores resultados na etapa anterior. Este traço foi caracterizado fisicamente pelas técnicas de porosidade ou índice de vazios superficiais; caracterização estrutural (Microscopia Ótica (MO), Microscopia Eletrônica de Varredura (MEV), Difração de Raios-x (DRX), Absorção no infravermelho com transformada de Fourier modo ATR (ATR-FTIR)). Por fim, na última etapa compreendeu a fabricação do protótipo da placa pré-moldada e os ensaios físicos da mesma (avaliação da dureza superficial pelo esclerômetro de reflexão e resistência à tração na flexão em um protótipo prismático). Os resultados apresentados indicam a viabilidade de utilização como um material construtivo, indicam ainda a possibilidade de minimização dos impactos ambientais, através da reutilização dos mesmos dentro do ciclo da construção civil.

This thesis describes the design and solution of the object for education of preschool aged children The nursery school situated in Ostrava consists of two classes, each with capacity of 20 children. Outdoor playground and parking lots for visitors and employees are included in the project. Building is designed as double-storeyed with partial basement and with extensive green roof. Floor plan is irregular, corresponds to few slipped (blended?) rectangles. Walls are made of ceramic blocks, ceilings is made of precast cencrete panels Spiroll.

The subject of this thesis is the design and assessment of steel sports hall in the town of Krnov. The main structural material is steel S355JR. The ground plan dimensions of the object is 48,0 metres to 36,0 metres, the height of the object is 16,78 metres. There is a sport facilities unit adjusted to the construction . The dimension of such an object is 30,0 metres to 8,0 metres. The support system consists of columns and an arched trussed rafter. The axial distance of cross-links is 8,0 m. The spatial rigidity is ensured by the transverse and longitudinal bracings. The hall is founded on reinforced concrete strip footings. The perimeter and roof cladding consists of sandwich panels. In this work is processed a static calculation of structural elements including connections and drawing documentation.

Corrosion of reinforcement in reinforced concrete is a huge problem. Corrosion of reinforcement has a great effect on the service life of reinforced concrete structures. The subject of this work is to verify the inhibitors properties and their efficiency using physical and electrochemical methods. The aim of this work is the design of formwork panels with corrosion protection. The formwork panels are on different material basis. Corrosion protection is ensured by the use of migration corrosion inhibitors.

The subject of the master thesis is a new hotel building. The hotel is a three-storey, non-basement building with a flat roof, which serves for temporary accommodation for 42 guests. On the first floor is a restaurant with all necessary facilities for guests and staff, lobby with a reception and a small shop. The other two floors are designed to accommodate guests. The hotel is based on foundation passports. The vertical load-bearing structures are made of ground brick blocks. They are insulated by contact insulation system ETICS. Horizontal structures are made of prestressed ceiling panels. Part of the master thesis is thermal engineering assessment, fire safety solutions and assessment in terms of acoustics and daylight. The master thesis contains a drawings and technical documentation.

The aim of this master's thesis is suggest and construct regulator for charge NiMH storage battery from photovoltaic (PV) panel. Function regulator is tracking maximum power point from PV panel (MPPT), control charge and evaluation full charge of battery.

The purpose of the dissertation is to develop selected parts of technologically – building project of residential houses in Rosice. The building will be used for living. The building has nine building sites, in the dissertation eight building sites are solved. Main building site SO 01 – Apartment house first and second is solved in detail. The dissertation includes a technical report about technologically-building project, the time and financial plan, a study of the realization of the main stage of its construction. The coordination of the building and site equipment including the principles of organisation building are solved graphically. The dissertation also includes a suggestion of the major building machine, plan of securing material source, technological regulations and the check and test plan for performing piles. A part of the dissertation is the budget of the building and safety risks on the building site and during performing piles.