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Additional reinforcement of wood elements
Janoušek, Radek ; Vejpustek,, Zdeněk (referee) ; Vaněrek, Jan (advisor)
This diploma thesis deals with the possibilities of additional reinforcement of wooden elements using different types of BFRP materials. In the practical part, an experiment of reinforcing plywood with external reinforcement using BFRP fabrics with different basis weights was performed. As part of the strength tests performed, the specimens were subjected to bending and shear stresses. To verify the bonding quality of the plywood, the bodies were exposed to the effect of elevated temperature and a delamination test was performed to determine the bonding quality of the plywood joints. The achieved values were evaluated and compared with the available literature.
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Development of wood-based board materials applying thermal modification process
Buriánek, Vlastimil ; Pipíška,, Tomáš (referee) ; Vaněrek, Jan (advisor)
This diploma thesis deals deals with the effectiveness of polyurethane and phenol-resorcinol-formaldehyde adhesives when applied in bonded joints of thermally treated sheet materials. The thermal resistance of commercially used adhesives was analysed as part of a research activity. Furthermore, the changes in the properties of wood materials after heat treatment were described. In the practical part, the effectiveness of the used adhesives on densified birch plywood was verified with respect to the shear strength of the resulting composite. Based on the results obtained, it was proceeded to verify the effectiveness of densification on spruce plywood.
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Analysis of the landslide area on the Odlezelské lake
Sachr, David ; Jerman, Jan (advisor) ; Roháč, Jakub (referee)
This thesis deals with the analysis of landslide areas in the vicinity of Odlezelské Lake, which is located in the western Limnic Permocarboniferous basin of the Žihel Basin. In this area, slope movements are not a frequent natural phenomenon. In the Czech Republic, this is the only slope deformation that has created a 'landslide lake' due to the damming of the Mladotický stream, which flows through this area. The geological conditions play a fundamental role here - the overlying strata consist mainly of arkosic sandstones, sandstones and siltstones. Layers of clay or claystone lie 20-30 metres below the ground surface and the average slope of the layers in the area is 10ř to the north-west, very close to the average slope in the landslides studied. An engineering geological analysis of the landslide areas in the area of Lake Odlezel was carried out. The area was depicted using LiDAR and DMR 5G in QGIS software and thus new morphological maps of the landslide areas were created. Data from the ČÚZK and 48 years old geomorphological maps, which were mapped by Prof. Janský, were used as a basis. Furthermore, a supplementary field survey was carried out, on the basis of which, in combination with LiDAR analysis, the contours of slope deformations of the previous authors were refined. Furthermore,...
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Influence of Climatic Factor for Landslides Formation
Olejár, Filip ; Novotný, Jan (advisor) ; Kudrna, Zdeněk (referee)
TITLE INFLUENCE OF CLIMATIC FACTOR FOR LANDSLIDES FORMATION ABSTRACT Slope movements are divided into several groups, either by speed, method of movement or by factors causing their formation. The climate conditions of different territories are one of the main reasons that significantly affect the formation of slope movements. The most important climate factor that causes slope movements is precipitation. However, the effect of freezing soil can also be included here because water in the soil changes its volume and after thawing changing geomechanical properties of the material. In this work, the impact of precipitation will be discussed as the most significant climatic factor that induces breaking of the slopes. Rainwater can either gradually infiltrate into the slope, or can infiltrate in the single event with a high amount of rainfall, until it reaches a critical stage during which the weight of watered zone together with pore pressure are being increased whereas the effective shear strength is being reduced. This causes subsequent disintegration of the slope and movement of material along the slip surface in case of sliding movements and along the native surface in case of debris flows. This work summarizes the available knowledge about the precipitation as a significant factor which affects the...
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Additional reinforcement of wood elements
Janoušek, Radek ; Vejpustek,, Zdeněk (referee) ; Vaněrek, Jan (advisor)
This diploma thesis deals with the possibilities of additional reinforcement of wooden elements using different types of BFRP materials. In the practical part, an experiment of reinforcing plywood with external reinforcement using BFRP fabrics with different basis weights was performed. As part of the strength tests performed, the specimens were subjected to bending and shear stresses. To verify the bonding quality of the plywood, the bodies were exposed to the effect of elevated temperature and a delamination test was performed to determine the bonding quality of the plywood joints. The achieved values were evaluated and compared with the available literature.
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Influence of Climatic Factor for Landslides Formation
Olejár, Filip ; Novotný, Jan (advisor) ; Kudrna, Zdeněk (referee)
TITLE INFLUENCE OF CLIMATIC FACTOR FOR LANDSLIDES FORMATION ABSTRACT Slope movements are divided into several groups, either by speed, method of movement or by factors causing their formation. The climate conditions of different territories are one of the main reasons that significantly affect the formation of slope movements. The most important climate factor that causes slope movements is precipitation. However, the effect of freezing soil can also be included here because water in the soil changes its volume and after thawing changing geomechanical properties of the material. In this work, the impact of precipitation will be discussed as the most significant climatic factor that induces breaking of the slopes. Rainwater can either gradually infiltrate into the slope, or can infiltrate in the single event with a high amount of rainfall, until it reaches a critical stage during which the weight of watered zone together with pore pressure are being increased whereas the effective shear strength is being reduced. This causes subsequent disintegration of the slope and movement of material along the slip surface in case of sliding movements and along the native surface in case of debris flows. This work summarizes the available knowledge about the precipitation as a significant factor which affects the...
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