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|Language of final thesis:||Slovak|
|Title of the thesis:||Buckling resistance of steel members and frames. Applications of new methods from Eurocodes|
|Summary:||The European standards for design of steel and aluminum constructions being implemented in the present contain some of the methods that were missing in the former standards. Therefore, these methods have not been used sufficiently yet in order to verify their correctness (accuracy). The aim of the first part of this work is to valuate and verify of correctness of an approximate method of calculating critical force in the case of a torsional-flexural buckling of a thin-walled, centrically compressed member. This method is based on an approximate solution of a system of differential equations (expressing the equations of equilibrium of a member) that were derived by Vlasov in his thesis . In order to be able to calculate a bigger amount of critical forces, a computing program based on the finite element method (FEM) was created. The second part of the work deals with buckling resistance of longitudinally or transversally welded aluminum members according to the standard . Regarding to a reduction in strength properties of aluminum in a heat affected zone (HAZ) caused by welding, there are certain particularities. Besides this, the method of effective thickness of an element's cross-section is implemented here, what is different from the method used in the case of steel members, where effective width of an element's cross-section is used. In the third part of the work I analyze the method of verifying buckling resistance of members with a non-uniform cross-section and/or with a non-uniform axial compression force and frames containing this kind of members based on the second order theory with an imperfection derived according to a buckling mode of a member or frame in an elastic condition. According to the possibility to use this method also in the case of members with a uniform cross-section and a uniform axial force and frames containing these members, there is a comparison with other methods of verifying buckling resistance from the standard .|
|Key words:||torsional-flexural buckling, critical force, thin-walled member, global analysis, imperfection, buckling mode, aluminium members with welds, buckling resistance|
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