Xingyan Fan , Lianghao Zou , Gang Hu , Jie Song , Xingxia Wu , Rongjie Pan
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引用次数: 0
Abstract
Most of conventional forced vibration systems consider only one-dimensional (1D) structural vibration of high-rise buildings and do not account for aeroelastic coupling effects when determining aeroelastic parameters. In the present study, the motivation-feedback mechanism is introduced to account for aeroelastic coupling effects. In addition, synchronous three-dimensional (3D) vibrations of the building model are achieved by employing a 3D forced vibration system. Aeroelastic parameters including aerodynamic damping and aerodynamic stiffness ratios are determined using the wind pressure and structural displacement responses measured from wind tunnel tests. The two aeroelastic parameters obtained from 3D forced vibration wind tunnel test are then compared with those from 1D forced vibration wind tunnel test, to indicate the meaning of synchronous 3D vibrations. Effects of aeroelastic coupling on the aeroelastic parameters are investigated systematically. In addition, effects of structural vibration frequency and amplitude on the two aeroelastic parameters are examined, and an expression for the aerodynamic damping ratio is proposed based on regression analysis. Results show that alongwind aeroelastic parameters are barely influenced by vibrations in the crosswind and torsional directions. However, either crosswind or torsional aeroelastic parameters are significantly affected by vibrations in both crosswind and torsional directions, demonstrating the considerable aeroelastic coupling between these two directions. Within the range of vortex lock-in wind speeds, the absolute value of the minimum of both aeroelastic stiffness and damping ratios gradually decreases with the increase of structural vibration amplitude; whereas the absolute value of the minimum of both aeroelastic stiffness and damping ratios increases with the structural vibration frequency.
期刊介绍:
Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed.
The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering.
Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels.
Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.