Load bearing steel structures for industrial fabric buildings

The thesis deals with fabric structures, which are made of aluminium or steel frames covered with PVC membrane. First, we analyzed and according to the standard EN 1999-1-1 checked design of existing aluminum structures, which consist of specially designed extruded hollow sections. Such buildings are used for storage and sports facilities, they have low total mass and are very easy and quickly assembled. We analyzed structures of various spans and with different design loads and found out they are all optimally designed. In the next step we focused on a design of steel structures according to standard EN 1993-1-1 with the same technical characteristics as aluminium structures. Structures with different spans, grids, design snow loads and with a use of different strengths of structural steel were analyzed. To ensure smooth outer lines of the building use of rectangular and square hollow sections was dictated. Main goal of design was optimal consumption of material. In the last part of the thesis we dealt with concept and design of improved and optimized solutions for joints. Simple production and fast assembly had to be assured in order to get closer to competitive aluminium structures. We evaluated the results and came to the conclusion that\ud use of steel in industrial fabric buildings with larger spans is better and thus also more competitive than the aluminium

De ratione studii: Educational vision of Erasmus of Rotterdam

Erazem Rotterdamski je kot ena izmed vodilnih osebnosti renesančnega humanizma napisal več vplivnih del s področja vzgoje in izobraževanja. V njih je predstavil svoja stališča o tem, kako je treba zastaviti vzgojo in pouk, da bi bili učenci deležni karseda kakovostne izobrazbe. Ta temelji predvsem na pridobivanju spretnosti v izražanju v klasičnih jezikih ter na branju antične literature, s pomočjo katere se učencu izoblikuje kreposten značaj. V svojih delih Erazem veliko pozornosti posveča pravilni usposobljenosti učitelja, ki mora biti vsestransko razgledan in načitan, pomembna pa je tudi njegova osebnost, saj mu mora biti učenec naklonjen, da učenje poteka čim učinkoviteje. Erazem se v svojih nasvetih zgleduje predvsem po antičnih in renesančnih piscih, saj meni, da je v obdobju srednjega veka kakovost izobraževanja upadla. Pričujoče magistrsko delo vsebuje tudi prevod Erazmovega priročnika za učitelje, naslovljenega O metodi pouka, v katerem povzema svoja stališča glede različnih vidikov izobraževanja.Erasmus of Rotterdam is one of the leading figures of the Renaissance humanism. He wrote several influential works concerning upbringing and education. They contain his views about the correct forms of raising and teaching children that are necessary for obtaining optimal education. It should be based on acquiring an advanced knowledge of classical languages and on reading classical, which helps to form a child\u27s character. In his works Erasmus often focuses on the optimal qualifications of a teacher, who needs to be well-read in a wide spectre of different disciplines. He needs to have a pleasant personality, so the children will be fond of him and the learning will be as efficient as possible. In his writings on education Erasmus follows the examples of writers from antiquity and renaissance, as he considers the education of the middle ages to be of inferior quality. The present master thesis also contains a translation of Erasmus\u27 handbook for teachers, titled On the method of study, which contains author\u27s views on various aspects of education

Ultimate limit state analysis of FRP composite sandwich plates – development of a semi-analytical method

The development of Sandwich PULS, a semi-analytical calculation tool for predicting the ultimate limit state (ULS) of FRP composite sandwich plates is presented. This was done by extending DNV GL’s semi-analytical calculation tool Composite PULS, which is used for quick estimation of the ULS for unstiffened composite plates. ULS was evaluated in terms of the first buckling load and the first ply failure (FPF). The Sandwich PULS code was developed by implementing formulations for sandwich plate theory. First-order shear deformation theory (FSDT) was implemented to include the transverse shear deformations that are highly important for sandwich plates with poor shear stiffness of the core. The Sandwich PULS code was evaluated against nonlinear finite element analyses (FEA). It was concluded that Sandwich PULS shows good agreement with FEA-predicted critical buckling loads. For all inspected plates, Sandwich PULS shows improved results compared to Composite PULS. Differences between Sandwich PULS and FEA are caused by the difference in evaluating shear stiffness. It has been shown that neglecting shear stiffness of faces results in good agreement between Sandwich PULS and FEA, while use of conventional shear correction factors proved to be unfavourable for sandwich plates. It was found that Sandwich PULS is limited in terms of slenderness. Sandwich plates with soft core should not have slenderness below 20 to assure an accurate solution

Optimus Pr\ue5m - Semi-submersible wind farm installation vessel for Blekinge Offshore

In Sweden the government is investing lots of resources in order to meet the energy need with clean and renewable alternatives. Since wind is an unlimited source of energy the exploitations of wind farms is of great interest. This report describes a conceptual design of an innovative offshore wind turbine installation vessel for inland sea conditions, with highest possible energy efficiency and environmental friendly performance in every detail. The customer, Blekinge Offshore, main requirement is to receive a concept with an as low installation cost as possible.The final concept Optimus Pr\ue5m includes one installation vessel, which is a semi-submersible barge, and one support vessel that supply the installation vessel with power and propulsion. The power is distributed from the support vessel to the installation vessel through a power cable. The installation vessel will be self-propelled during the installation phase using electrical motors and thrusters.The installation vessel shall be able to handle gravity foundations and fully assembled wind turbines, transported vertically to the installation site. Foundations and windmills will be fully assembled in Karlshamn port before transit to site. During transit the installation and support vessel are connected to each other in all motions except pitch. This almost total fixed connection makes the two vessels acts like one, which gives the joint vessel excellent manoeuvrability. When installing foundations, the installation vessel and the support vessel disconnect. The installation vessel places the foundation at the planned location by ballasting until the foundation has reached the seabed. After de-ballasting the installation vessel and support vessel connects again and transit back to the harbour. When installing wind turbines the two vessels are kept connected and makes highly accurate positioning for the installation possibl