Abstract
Abstract Usually, the analysis of structures under wind loading is performed using an equivalent static analysis, where the influence of floating response is taken into account by the gust factor. This methodology can be used in case of rigid structures for not presenting a considerable dynamic response. More flexible structures, in particular those lightly damped, may show an important resonant response and their dynamic properties must be considered in the analysis. The aim of this paper is to present a methodology for dynamic analysis of structures under wind loading considering the geometric nonlinearity, the vibration caused by the kinetic energy of wind gusts and the aerodynamic damping due to the relative movement between this structure and the wind. The formulation proposed is applied to a 180-meter-high concrete chimney and the results were compared with those obtained through the recommendation given in the standard ABNT NBR 6123:1988 [2] for the dynamic structural analysis.
Highlights
Accidents with structures subjected to wind which did not reach the design speed indicate that the collapse may have been caused by dynamic effects or errors in the estimation of wind force
The aim of this paper is to present a methodology for dynamic analysis of structures under wind loading considering the geometric nonlinearity, the vibration caused by the kinetic energy of wind gusts and the aerodynamic damping due to the relative movement between this structure and the wind
This paper aims to present a methodology for the evaluation of the dynamic effects caused by the kinetic energy of wind gusts, considering the fluid-structure interaction and the geometric nonlinearity
Summary
Accidents with structures subjected to wind which did not reach the design speed indicate that the collapse may have been caused by dynamic effects or errors in the estimation of wind force. Structural systems subjected to wind forces present themselves in different forms, for example: cables, low and high buildings, chimneys, towers, bridges, among others It is a complex task defining parameters for the evaluation of the necessity to perform dynamic analyses in the design of the most varied types of structures. Structures submitted to wind are evaluated through static analyses with equivalent loads, where the influence of the resonant response is taken into account by the gust response factor, proposed by Davenport [15] This methodology is relevant in structures with natural frequencies higher than 2.0 hertz, sufficiently rigid for not presenting significant resonant response [1]. For the dynamic evaluation of other structural typologies there are no procedures or guidelines in this standard
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