Parametric study of stressed skin for supporting individual members against lateral buckling
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Parametrinen tarkastelu levyrakenteille terässauvojen nurjahdustuentana
In this thesis, support against lateral elastic buckling of steel members is examined using trapezoidal sheeting and faced sandwich panels. The main issue is to study, what kind of members can be supported with different stiffening solutions and how various parameters affect the usability of the solutions. The thesis presents theories for calculating elastic buckling length and connector forces. Buckling length of members supported by trapezoidal sheeting are calculated with Winkler foundation theory and connector forces are calculated with method from standard SFS-EN 1993-1-1. For members supported by sandwich panels, elastic buckling lengths and connector forces can be calculated with theory presented by Eva Hedman-Pétursson in her doctoral thesis. In this thesis, theory is presented also for different boundary conditions than simply supported beam. In the parametric study, different supporting solutions and related variables are examined. The results are presented for members with different lengths as a maximum normal force the member can resist before buckling resistance or shear resistance of connector gives utilization ratio one. The main variables affecting the axial force resistance of supported members are the buckling resistance of unsupported member, stiffness of connections and shear resistance of connections.