Abstract
This paper describes the research on the mechanical behavior of a container crane subjected to variable wind loading. In the first step the wind action was studied and defined. Stochastic wind loading was simulated by means of power spectrum method. Preliminary analyses were carried out on a chimney (100 m) because its geometry is very simple. Many different schematizations were implemented both to evaluate the results convergence and to define the correct finite element method schematization. At the end, the results were compared with those obtained by classical methodology, i.e. by response to an equivalent force which was evaluated by multiply the wind pressure with the front area and defined coefficients. The next step was to design the crane (pay load =50 t) and to study the mechanical response of the structure to the dynamic wind actions defined in the previous step. The results (displacement) of numerical analyses show that the classical method used to study the wind actions applied on the structures overestimates those determined by power spectrum method.
Highlights
The lifting equipment and in particular the crane machine are subject to different load conditions; as well as the actions induced by the pay load many other forces acting on the structures
FME Transactions (2018) 46, 299-305 299 can be represented by means of equivalent load distributions which, statically applied to the construction or its elements, provide maximum values for the displacement and stress generated by the dynamic wind action
The numerical analyses performed by the stochastic wind actions method is more complex than the classical equivalent static force method
Summary
The lifting equipment and in particular the crane machine are subject to different load conditions; as well as the actions induced by the pay load many other forces acting on the structures Some of these are actions induced by moving load (lift and lower) or moving the structure or part of it [1,2,3,4], snow and ice, temperature variation, wind, earthquake [5], thermal action, actions that arise during assembly, construction or removal of the crane, etc. The first part of this paper reports the study conducted on a simple geometry like chimney to define a wind numerical model and study the influence by the main
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