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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Wind and Structures
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Volume 3, Issue 4 - Dec 2000
Volume 3, Issue 3 - Sep 2000
Volume 3, Issue 2 - Jun 2000
Volume 3, Issue 1 - Mar 2000
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A comparison of numerical simulations and full-scale measurements of snowdrifts around buildings
Thiis, Thomas K. ;
Wind and Structures, volume 3, issue 2, 2000, Pages 73~81
DOI : 10.12989/was.2000.3.2.073
Snowdrifts around buildings can cause serious problems when formed on undesirable places. The formation of snowdrifts is highly connected to the wind pattern around the building, and the wind pattern is again dependent on the building design. The shear stress on the surface and snowdrifting around different buildings are investigated through CFD analysis and compared to measurements. The computations of shear stress shows local minima in the same areas as snowdrifts are formed. The snowdrifting computations utilises a drift-flux model where a fluid with snow properties is allowed to drift through a fluid with air properties. An apparent dynamic viscosity of the snow/air mixture is defined and used as a threshold criterion for snowdrifting. The results from the snowdrifting computations show increased snow density where snowdrifts are expected, and are in agreement with previous large-scale snowdrift measurements. The results show that computational fluid dynamics can be a tool for planning building design in snowdrifting areas.
Response of fiber reinforced plastic chimneys to wind loads
Awad, A.S. ; El Damatty, A.A. ; Vickery, B.J. ;
Wind and Structures, volume 3, issue 2, 2000, Pages 83~96
DOI : 10.12989/was.2000.3.2.083
Due to their high corrosion and chemical resistance, fiber reinforced plastics (FRP) are becoming widely used as the main structural material for industrial chimneys. However, no national code currently exists for the design of such type of chimneys. The purpose of this study is to investigate analytically the response of FRP chimneys to wind loads. The classical lamination theory is used to substitute the angle-ply laminate of a FRP chimney with an equivalent orthotropic material that provides the same stiffness. Dynamic wind loads are applied to the equivalent chimney to evaluate its response to both along and across wind loads. A parametric study is then conducted to identify the material and geometric parameters affecting the response of FRP chimneys to wind loads. Unlike the across-wind response, the along-wind tip deflection is found to be highly dependent on the angle of orientation of the fibers. In general, the analysis shows that FRP chimneys are very vulnerable to across-wind oscillations resulting from the vortex shedding phenomenon.
Aspects of the use of proper orthogonal decomposition of surface pressure fields
Baker, C.J. ;
Wind and Structures, volume 3, issue 2, 2000, Pages 97~115
DOI : 10.12989/was.2000.3.2.097
The technique of proper orthogonal decomposition is potentially useful in specifying the fluctuating surface pressure field around structures. However there has been a degree of controversy over whether or not the calculated modes have physical meanings. This paper addresses this issue through consideration of the results of full scale experiments, and through an analytical investigation. It is concluded that the lower, most energetic modes are likely to reflect different fluctuating flow mechanisms, although no mode is likely to be associated with just one flow mechanism or vice versa. The higher, less energetic modes are likely to represent interactions between different flow mechanisms, and to be significantly affected by the number of measurement points and measurement errors. The paper concludes with a brief description of the application of POD to the problem of building ventilation, and the calculation of cladding pressures.
Dynamic response of a bridge deck with one torsional degree of freedom under turbulent wind
Foti, Dora ; Monaco, Pietro ;
Wind and Structures, volume 3, issue 2, 2000, Pages 117~132
DOI : 10.12989/was.2000.3.2.117
Under special conditions of turbulent wind, suspension and cable-stayed bridges could reach instability conditions. In various instances the bridge deck, as like a bluff body, could exhibit single-degree torsional instability. In the present study the turbulent component of flow has been considered as a solution of a differential stochastic linear equation. The input process is represented by a Gaussian zero-mean white noise. In this paper the analytical solution of the dynamic response of the bridge has been determined. The solution has been obtained with a technique of closing on the order of the moments.
A review of tropical cyclone wind field models
Wills, J.A.B. ; Lee, B.E. ; Wyatt, T.A. ;
Wind and Structures, volume 3, issue 2, 2000, Pages 133~142
DOI : 10.12989/was.2000.3.2.133
Engineered structures such as buildings and bridges in certain regions of the world need to be designed to withstand tropical cyclone winds, otherwise known as typhoons or hurricanes. In order to carry out this design, it is necessary to be able to estimate the maximum wind speeds likely to be encountered by the structure over its expected lifetime, say 100 years. Estimation of the maximum wind involves not only the overall strength of the tropical cyclone, but the variation of wind speed with radius from the centre, circumferential position, and with height above the ground surface. In addition, not only the mean wind speed, but also the gust factor must usually be estimated as well. This paper investigates a number of recent mathematical models of tropical cyclone structure and comments on their suitability for these purposes in a variety of scenarios.