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The aim of this master’s thesis is to design a footbridge across a river. The main objective is design and analysis of a footbridge supported by a steel arch. Stress ribbon is suspended on steel arch using hangers. The analysis of the structure has been carried out using ANSYS 12.0 and Nemetschek SCIA 2011.1 software, design checks using EXCEL in accordance with Eurocodes. Time dependent analysis was considered.

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No description available.

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No description available.

In recent years a significant portion of proton exchange membrane fuel cell (PEMFC) work has been focused on understanding and optimizing the functions of the microporous layer (MPL). Researchers have found that including this layer, composed of carbon black and TeflonTM (PTFE), between the gas diffusion layer (GDL) and catalyst layer (CL) of PEMFCs improves performance. The major benefit of the MPL in conventional fuel cells is that it improves water management and reduces contact resistances between cell layers. Although the functions of the MPL in conventional PEMFCs are well understood, the essential functions and optimal formulation of the layer in planar PEMFCs which operate without stack compression, are for the most part unknown. This work determines the essential functions and optimal composition, loading and sintering pressure of the MPL in a planar fuel cell design called a Ribbon Fuel Cell. Adhesion as well as performance data were gathered to determine the essential functions and formulation of the MPL which leads to high performance and durability in Ribbon Fuel Cells. Statistical models were created based on performance data of cells constructed with various MPLs; and a MPL composed of 45 wt% PTFE, loaded at 3.5 mg/cm° and sintered between 20 and 40 psi was found to exhibit optimal performance and durability. The reason why such a high PTFE content yields optimal results is because it strengthens the MPL, allowing it to successfully join various cell layers together, a function that is essential in Ribbon Cells which operate without external stack compression. / Master of Science

This thesis is a series of experiments performed on how ribbon-like bands of material can be folded to generate special volumes that can accommodate the functional aspects of a building program. / Master of Architecture

Operating within a dense urban context, a public building recognizes the activities that are contained within its boundaries... further tying the place to a larger urban spatial sequence. / Master of Architecture

The aim of this thesis is the design and analysis of pedestrian bridge across the deep valley. There were designed three variants. The variant of structure, which combines stress ribbon with concrete arch, was chosen for the analysis. The optimal geometry was found using iteration methods with VBA Excel. The calculation model was made in software Ansys 19.0, considering phases of construction. The Ultimate limit state and the service limit state were evaluated as well as dynamic behavior of construction – modal analysis (eigenfrequencies and eigenshapes) and response to harmonic excitation. The design and assessment are according to the European standards.