Um painel sanduíche consiste essencialmente em duas faces, podendo inclusive possuir reforços metálicos e um núcleo formado normalmente por um polímero celular. As faces deste tipo de painel podem estar unidas por um adesivo estrutural, ou por espuma rígida de poliuretano (PU) injetado diretamente sobre os substratos, quando a união ocorrerá naturalmente. A propriedade de maior relevância que o painel sanduíche deve ter para o transporte de cargas congeladas (0ºC a -30ºC) ou refrigeradas (7ºC a 1ºC) é a condutividade térmica (k). Dentro deste contexto o objetivo deste trabalho foi propor e caracterizar painéis sanduíches que possam ser utilizados em câmaras frigoríficas. Este trabalho apresenta as seguintes alternativas para compósito sanduíche: amostra 1 (PRFV/PU/PRFV); amostra 2 (AG/PU/AG); amostra 3 (Frisado/PU/PRFV); e amostra 4 (Al/PU/Al), onde PRFV é poliéster reforçado com fibra de vidro, PU é espuma rígida de poliuretano, AG é aço galvanizado, Frisado é alumínio frisado, e Al é alumínio. Estes painéis foram caracterizados quanto às propriedades físico-mecânicas, térmicas, morfológicas e custo. Foi possível concluir que o sistema (AG/PU/AG) mostrou o melhor custo versus desempenho dentre os compósitos propostos. / A sandwich panel consists essentially of two face sheets and may even have metal reinforcements and a core formed, usually by a cellular polymer. The faces of this type of panel may be joined by a structural adhesive or in cases where the core is a rigid polyurethane foam injected directly on the substrates the union will occur naturally. The most relevant property of the sandwich panels for the transport of frozen (0ºC a -30ºC) or chilled (7ºC a 1ºC) cargo is thermal conductivity (k). Within this context the objective of this work is to obtain and characterize sandwich panels which can be used in refrigerated chambers. This work presents four alternatives for composite sandwich, sample 1 (PRFV/PU/PRFV), sample 2 (AG/PU/AG), sample 3 (Al Crimpy/PU/PRFV) and sample 4 (Al /PU/Al), were PRFV is a glass fibre reinforced plastics, PU is a rigid polyurethane, AG is galvanized steel, Al Crimpy is crimpy aluminum and Al is aluminum. These composites were characterized by physicalmechanical, thermal, morphologic and cost. It could be concluded that the AG/PU/AG showed the best cost versus performance.

This thesis aims to design a bearing composite steel structure for five-storey administration building with ground plan dimensions 35,00 x 50,00 m. Designed building has L-shaped plan, flat roof and attic all the way around. The largest part of the plan area occupies office zone with dimensions of 48,60 x 18,90 m. Contiguous zone communication and sanitation has dimensions of 13,50 x 15,90 m. Floor height is designed 3,60 m, the total height of the building is 18,70 m. Composite steel floor structure consists of transverse primary beams and hinge-connected secondary beams. Integrated formwork (trapezoidal sheet) has ribs oriented perpendicular to the secondary beams. Coupling is bidirectional. Construction will be done in two variants. Variant No.1 assumes primary and secondary beams (at the columns) hinge-connected with columns. In variant No.2 will be frame connection between primary beams and columns and together they will create 2D transverse frames with hinge-connected secondary beams. The supporting structure of the roof is designed similarly to ceiling, but reinforced concrete slab will be replaced with bracing in the roof plane and self-bearing rib sandwich panels. Vertical sheathing of the building provide sandwich panels and strip windows. The type of steel is S355. The building is designed for the site Hradec Králové. Standards and documents used in design of the bearing structure are included in the list of sources. The result of this work is a static analysis with an assessment of all elements of the selected (best) variant of the structure, drawing documentation and technical report.

Main goals of this master thesis are following: to perform the state of the art research of overpressure constructions (especially space habitats, plane fuselages); to create an own concept of the functional inside ending (hole) in the sandwich panel for a door; to perform stress-strain analysis of this concept; to perform the design optimalization of this concept in order to minimise the weight. To solve the problems above software Ansys 17.2 is chosen, because it allows to: model the material of the honeycomb core of sandwich panel as homogenous linear orthotropic material; evaluate reserve factors of all critical limit states; perform the design optimalization; perform Monte Carlo simulation. First and second design optimalizations discover, that with defined parameters: 0,635 mm width of aluminium sandwich face sheets and inner overpressure 0,1 MPa, a creation of the model, that would be safe by changing the values of design variables is not possible. Specifically, the maximum value of shear stress on the glued areas between aluminium face sheets and honeycomb core is higher than the shear strength of the glue. Therefore, two new concepts are created. First for inner pressure 0,03 MPa and bigger width of aluminium face sheets 3,175 mm, second for inner pressure 0,02 MPa and same width of aluminium face sheets 0,635 mm. For both these concepts, an overall reserve factor is calculated. First, the value of an overall reserve factor is calculated deterministically. Secondly, the value of an overall reserve factor is calculated stochastically considering the variance of material properties of the honeycomb core ± 10 % by Monte Carlo simulation. An overall reserve factor of the concept with inner pressure 0,02 MPa is determined as 1,21. An overall reserve factor of the concept with inner pressure 0,03 MPa is determined as 1,20. The weight of the concept for inner pressure 0,03 MPa is though 4 times bigger than the weight of the concept for inner pressure 0,02 MPa. In the concept for inner pressure 0,02 MPa the maximum value of HMH stress in aluminium components is critical, stochastically considered material properties of the honeycomb core don’t have a significant influence on this value. In the concept for inner pressure 0,03 MPa the value of maximum shear stress on the glued areas between aluminium face sheets and the honeycomb core is critical, stochastically considered material properties of the honeycomb core have a significant influence on this value. In the concept for inner pressure 0,03 MPa an absolute error of overall reserve factor is 8 % (overall reserve factor calculated deterministically was 1,28) which is significant. Monte Carlo simulation is also used to find that the value of Poisson ratio XY of the honeycomb core doesn’t have statistically significant influence on all limit states. Value of the reserve factor of the honeycomb core is higher than 2 in both concepts. Monte Carlo simulation discovers that this value can be significantly lower. Using Tsai-Wu failure criteria the reserve factor in the concept for inner pressure 0,02 MPa is determined as 2,72 deterministically x 2,41 stochastically (absolute error 31 %), in the concept for inner pressure 0,03 MPa the reserve factor is determined as 6,85 deterministically x 6,17 stochastically (absolute error 68 %).

No description available.

Die Anwendung von textilbewehrtem Beton ermöglicht vorgefertigte, filigrane und leichte Betonkonstruktionen von hoher Dauerhaftigkeit und Oberflächenqualität. Stand der Technik in der Anwendung sind hinterlüftete Fassadenplatten mit Dicken von 20-35 mm und Größen von bis zu 12,3 m², die aufgrund der geringen Querschnittssteifigkeiten nur mit metallischen oder monolithischen Aussteifungen realisierbar sind. Steife, tragfähige und dennoch leichte Querschnitte lassen sich mit Sandwichkonstruktionen erreichen, die große Spannweiten und zusätzliche Einsparpotentiale im Betoneinsatz und der Gesamtbauteilstärke ermöglichen. Insbesondere selbsttragende Sandwichkonstruktionen bieten ein hohes Anwendungspotenzial im Fassadenbereich. Der vorliegende Beitrag berichtet über Lastannahmen, Tragverhalten, Herstellung und Anwendung beim Hallenneubau des Instituts für Textiltechnik, RWTH Aachen.

The doctoral thesis focuses on problem of stability of steel thin-walled beams with lateral and torsional restraints along the spans. Theoretical background of lateral-torsional buckling of an ideal beam with and without restraints preventing out-of-plane buckling is briefly described. In the following chapters the problem of stabilization of steel thin-walled beams by planar members is dealt with. The state of the art in this field is summarized and some open questions are identified. The research in this field could bring new findings about actual behavior of these structural systems. The rate of stabilization can be quantified using values of shear and rotational stiffness provided to a thin-walled member by a planar member. In the frame of the thesis the problem of torsional restraint given to steel cold-formed members by sandwich panels under load is discussed. In case of the uplift load applied on the sandwich panels the torsional restraint should be verified by experimental analysis. To contribute to this field, experimental verification of rotational stiffness provided to steel cold-formed beams by sandwich panels was proposed and performed. Torsional restraint under no external load as well as under uplift load applied on the panels was investigated. The purpose was to obtain the values of the rotational stiffness provided by planar members. The performed tests indicate significant and practically applicable rate of the torsional restraint even in case of the uplift load on the surfaces of the panels. Utilization of the values of the rotational stiffness might result in more economical, effective and reliable structural design. Selected problems were investigated using numerical modeling in a finite element method based software.

The master‘s thesis concerns about the freestanding multipurpose sport hall with a base for sportsmen and spectators and its associated sport and regeneration centre. The object is situated in a city district Brno Bohunice. The designed building is divided into a single storey multipurpose sport hall and an outbuilding with two above-ground floors and a partial third floor above the entrance part of the building. Object’s plan shape forms a rectangle with recessed entrance part. The load-bearing structure consists of a combined column and wall construction system. The main multipurpose hall is roofed with arched glulam laminated trusses, which are supported by steel columns covered by sandwich panels. The outbuilding’s vertical load-bearing structure is formed by clay blocks. The horizontal load-bearing structure is formed by prestressed concrete floor slab. The building is based on shallow foundations. The object is designed to be barrier-free for sportsmen and visitors as well.

This diploma thesis is being solved for documentation of building in the stage of execution. The building is designed as a showroom with car repair shop. The building site is located in the land registry of Ostrava – Vítkovice. Project documentation is designed accordingly to the valid Czech Republic’s laws, bills and building standards. The building is divided into two objects the first one is showroom with administration and the second one is the car repair shop with washing room and restrooms. These two objects are structurally and operationally connected. The largest plan dimensions are 68,56 x 38,36 m. The building is designed as a reinforced concrete frame in the administrative part and a reinforced concrete wall system in the car repair part. The roof is in both cases realized by using steel trusses. The reinforced concrete frame is lined with aerated concrete masonry. In the roof part it is cladded with sandwich steel panels. The building is founded on reinforced concrete foundation pads with combination of strip foundations. The car repair shop is designed as one floor building, whereas the administrative part is designed as two floor.

This master´s thesis deals with a complete renovation of a shop in Vyškov. A part of this thesis represents a technical report of the worksite facilities, technological standard, inspection and test plan, machine design, plan of safety and protection of environment, contract for work, budget and schedule.

The subject of this master thesis is the elaboration of project documentation for the construction of a car showroom & service. This building is located in Brno, cadastral area of city Brno: Královo Pole. It is a detached building without a basement built on a trapezoid shaped area with a flat terrain. Object is divided into two functional parts: the car showroom and the car service. These two parts are constructionally and operationally connected. The car showroom is designed as a two-storey object, which serves as car exhibition, technical and hygienic facilities and mainly the administrative parts of both objects. The car service is designed as a single-storey object without a basement, which serves as a workspace of the car service and a warehouse. The load-bearing structural system of the car showroom is made of reinforced concrete pillars with ceramic masonry. The load-bearing structural system of the car service is made of reinforced concrete pillars with light sandwich panels. The foundation slab consists of prefabricated stepped foundation pad, prefabricated reinforced concrete grade beam and concrete strip footing. Insulation system of the building is made of insulation boards from basalt wool cladding by ventilated facades with perforated steel panels. Insolation in the car showroom is secured by glass curtain wall in combination with plastic windows and doors. Ceiling structures are designed as prestressed ceiling panels Spiroll. Roofing structure of both objects is supported by prestressed reinforced concrete roof girder in combination with trapezoidal sheet and insulation boards from basalt wool and PIR boards. The roof of the objects is flat with ordinary layer order with waterproof layer from softened PVC.