Une caisse automobile est un ensemble complexe formé de plusieurs éléments qui sont souvent constitués de matériaux différents et assemblés principalement par points soudés, généralement à plus de 80%. Au stade de la conception, plusieurs critères doivent être vérifiés numériquement et confirmés expérimentalement par le prototype de la caisse, dont sa tenue en endurance. Dans le contexte économique actuel, la politique de réduction des dépenses énergétiques ou autres a conduit les constructeurs automobiles à optimiser les performances des véhicules actuels, en particulier en réduisant de façon très conséquente la masse de leur caisse. Des problèmes liés à la tenue structurelle ou à la tenue en fatigue de la caisse sont alors apparus. Afin d'être validé, le prototype de caisse doit avoir une résistance suffisante pour supporter les essais de fatigue. Les tests de validation sur bancs d'essais réalisés en amont sur un prototype sont très coûteux pour l'industriel, en particulier lorsque les tests d'essais en fatigue sur la caisse ne permettent pas de confirmer les zones d'apparition des fissures identifiées par simulations numériques. Le sujet de la thèse se limitera à ce dernier point. Il porte sur l'ensemble des analyses à mettre en oeuvre afin d'étudier la tenue en endurance de caisses automobiles soumises à des profils de mission sévérisés. L'objectif principal est de mettre au point un processus d'analyse en simulation numérique permettant de garantir un bon niveau de prédictivité de tenue en endurance des caisses automobiles. On entend par bon niveau de prédictivité, le fait d'être en mesure de corréler correctement les résultats d'essais associés aux profils de missions sévérisés classiquement utilisés dans les plans de validation de la caisse. Cette thèse a conduit à :_ analyser le comportement mécanique de la caisse et les forces d'excitations appliquées au cours de l'essai de validation,_ établir une nouvelle méthode de réduction d'un chargement pour les calculs en endurance,_ mettre au point une nouvelle modélisation EF des liaisons soudées par points,_ améliorer les modèles de prédiction de durée de vie des PSR. Les études menées ont ainsi permis d'améliorer le niveau de prédiction des calculs en fatigue de la caisse afin :_ d'identifier la majorité des zones réellement critiques sur la caisse,_ d'évaluer de manière fiable de la criticité relative de chacune de ces zones,_ d'estimer de façon pertinente la durée de vie associée à chacune de ces zones / A body-in-white (biw) is a complex structure which consists of several elements that are made of different materials and assembled mainly by spot welds, generally above 80%. At the design stage, several criteria must be verified numerically and experimentally by the car prototype, as the biw durability. In the current economic context, the policy of reducing energy and other costs led automotive companies to optimize the vehicle performances, in particular by reducing very consistently the mass of the biw. As a consequences, some structural design problems appeared. In order to be validated, validation test benches are carried out upstream on a prototype vehicle. They are very costly to the manufacturer, especially when fatigue tests do not confirm the cracks areas identified by numerical simulations. The thesis is focused on numerical biw durability analysis. It covers all the numerical analysis to be implemented to study the biw durability behavior. The main objective is to develop a numerical simulation process to ensure a good level of durability prediction. It means to be able to have a good correlation level between test bench results and numerical fatigue life prediction. This thesis has led to:_ analyze the biw mechanical behavior and the excitation forces applied to the biw during the validation tests,_ establish a new fatigue data editing technique to simplify load signal,_ create a new finite element spot weld model,_ develop a new fatigue life prediction of spot welds. The studies have thus improved the level of biw fatigue life prediction by:_ identifying the majority of critical areas on the full biw,_ reliably assessing the relative criticality of each area,_ accurately estimating the lifetime associated with each of these areas

This master´s thesis deals with the issue of the building from a clay. It is focused on defects and rehabilitations of these constructions. The introductory parts concerns with probable defects especially of clay buildings, furthermore with causes of the creation of defects, its depictions and the relevance. In the following part the methods of rehabilitation not only of clay buildings are presented. In this part the rehabilitative methods of foundation, vertical and wood constructions, which create mainly the structural support of the buildings, are described. In the second part, the structural and technical research of the current structure with farm part – barn is executed. The part of research is creation of the drawing documentation, description of disposition and structural and constructional solution of building, structural calculation of a part of construction, assessment of actual state of structure and prospective plan of proceeding and rehabilitation.

The aim of this diploma thesis is the design of bearing construction of the Exhibition gallery in Olomouc. The building is of irregular shape with the biggest span of 50 m. The bearing structure in the highest point goes up to 14,6 m. The main design material is the glue-laminated timber GL24h and GL32h. The optimization of chosen parts of the structure has been made and the best option was then used in the detailed structural calculation. The bearing structure consists of circular columns to which the floor beams and roof trusses are connected. The irregular structure of the gallery comprises of three different roof types – flat trafficable roof, double-pitched glass roof formed by pitched cambered trusses and single-pitch roof spanning over the central part of a 20,7 m span. Within the thesis the design and check of the main structure members and connections has been made. The entire structure is pinned and its stiffness is secured by the system of tension rods and rigid floor and roof construction respectively.

The master's thesis deals with design and static assessment of loadbearing structure the timber viewtower on the hill Hostyn. The shape of the structure is very close oblate spheroid. Towers plan shape is a regular octagon whose outer diameter varies along the height. Tower in the footing and in the top measure 10,5 meters, at mid-height measure 6.5 meters. The height of the viewtower is 35 meters and view floor is located at a height of 30.5 meters. The main structure of tower consists outer towers curved wooden columns and interior steel column. Columns support the horizontal beams and bracing provide rigidity of the structure. The roof has a pyramid shape towers and tends to 17 °. Outer columns are designed from glued laminated wood GL24h, others carrying wooden beam are designed from solid timber C24 steel rods are designed from steel S235. Connections are solved using steel components. The work includes structural calculation, technical report and drawings.