Rosario-Galanes, Osvaldo

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Modeling of wind induced fatigue of thinwalled folded plates
(2011) Rosario-Galanes, Osvaldo; Godoy, Luis A.; College of Engineering; López, Ricardo R.; Saffar, Ali; Department of Civil Engineering; Pérez, Néstor
During high wind events thin-walled folded plates such as roof claddings suffer extensive damage due to fatigue failure at their screwed connections. Currently, damage prediction is based on fragility curves and semi-empirical models where there is no direct relation between loads and failure parameters. In this research a finite element model and fatigue criteria were validated in correlating a wind loading protocol to a specific fatigue failure mechanism. The 3D fatigue process was reduced to a one-dimensional problem by using one or two strain and stress parameters from the finite element model. These parameters were used on a fatigue stress-based and strain-based criteria to establish a fatigue failure mechanism. The fatigue life, and crack directions were predicted as a function of loading parameters and specific cladding configuration. As a result a roofing assembly can be evaluated and rated to withstand a specific wind resistance according to a specific loading protocol.