Uncertainties of the duration of strong winds and equations expressing fatigue damage induced by randam vibration make it difficult to evaluate windinduced fatigue damage. And the change of the load-deflection characteristics crossing the yield stress interferes with the brief estimation of elasto-plastic response . This paper concerns an expanded Typhoon Model, a brief calculation method of elasto-plastic response and the extrapolating fatigue equation for all stress levels including high stresses beyond yield point. As an example, the wind load, deflectiond and fatigue damage are calculated for the steel plate dampers to prevent the exceeding stress .
