Goran Radoicic, Miomir Jovanovic

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Climate changes on the planet have led to the appearance of extreme natural influences on large structures in ports and shipyards, as well as at-sea structures. One of the most variable meteorological effects in space and time is the wind. This paper provides the manner of dynamic modelling of wind loads on a tall portal-rotating crane structure. The gust of wind is modelled as a wave quantity variable in time and altitude of flow. Dynamic wind activity on tall structures is used to obtain a structure’s behaviour with regard to extreme climate events when frequently resonant influences occur. This is performed by non-linear transient FEM analysis. Structural damping is modelled by conversion to the equivalent viscous damping. Eigenfrequencies are obtained by applying the Lanczos method which combines the tracking method and the transformation method. The paper contains an originally developed dynamic model, experimentally verified stiffness, and internal static quantities. The aim of the paper (Case Study) is to obtain the wind activity which would cause the loss of dynamic stability of the crane due to multiple resonant gusts of wind. Such analyses can be employed to determine the real risk from a potential failure in tall structures caused by environmental, meteorologically registered activities.

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