Análise da flambagem elástica e da resistência de telhas autoportantes de aço formadas a frio

Abstract

The present investigation addresses the main structural aspects related to the performance of large span orthotropic roofing system, based on thin-walled stiffened cold-formed sections, CFS. The study is focused on the structural performance under bending effects of stiffened trapezoidal CFS, strongly affected by the variation of its cross-section geometrical properties. The structural efficacy is estimated with the aid of elastic buckling analysis allowing identification of the concerned buckling modes and critical bending moments. The obtained results indicate the main geometrical aspects and dimensions of the intermediate stiffeners to be considered in order to improve the buckling behavior of the trapezoidal CFS. It was concluded that the design of improved trapezoidal CFS are deeply dependent of the shape, geometry and distribution of the intermediate stiffeners in the cross-section. Minor adjustments in the geometry of the intermediate stiffeners can significantly change the buckling behavior. The adopted methodology is described and the final results of improved trapezoidal CFS indicate the best sections for both structural resistance and roofing coverture efficacy.