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Different teqniques to analize wind effects on corner pressures of amedium-rise building

Different teqniques to analize wind effects on corner pressures of amedium-rise building

Mostra/Nascondi contenuto.
1 – Wind phenomenon ______________________________________________________________________ 4 1 Wind phenomenon The study of wind behavior and the determination of its intensity is extremely complicated mainly because it is impossible to represent physically the forces field. Whereas for the representation of almost every load acting on the structure is possible to use vectors or distributed load, for wind it is necessary to use a statistical approach. Even the regulation code requests a precise description of wind strength considering its dependence on a large amount of parameters and statistically analyzing the collected data. The horizontal load of wind on the vertical side structure will be considered; it is difficult to establish the response of a structure to this load due to the trouble in defining univocally the force for it is unknown in every time null . The modal analysis and the dynamic’s study of building requests the knowledge of the force and of its behavior in time. Those are the deterministic forces (periodic or non- periodic ones). In Appendix A there is a statistical approach to the study of this kind of deterministic forces. 1.1 The study of the wind The main characteristics of real turbulent wind is the subject of this paragraph. The complex wind behaviour requires a statistical explanation, as it was underlined above. Wind is caused by a difference in atmospheric pressure. At great heights the air movement is not influenced by earth surface, whereas below a certain height, called delta gradient height (or boundary layer), surface’s friction modifies wind flow, creating turbulence. The boundary layer changes according to the ground underneath.

Laurea liv.II (specialistica)

Facoltà: Ingegneria

Autore: Martino Carrettini Contatta »

Composta da 210 pagine.

 

Questa tesi ha raggiunto 71 click dal 18/02/2011.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.