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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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Modal transformation tools in structural dynamics and wind engineering
Solari, Giovanni ; Carassale, Luigi ;
Wind and Structures, volume 3, issue 4, 2000, Pages 221~241
DOI : 10.12989/was.2000.3.4.221
Structural dynamics usually applies modal transformation rules aimed at de-coupling and/or minimizing the equations of motion. Proper orthogonal decomposition provides mathematical and conceptual tools to define suitable transformed spaces where a multi-variate and/or multi-dimensional random process is represented as a linear combination of one-variate and one-dimensional uncorrelated processes. Double modal transformation is the joint application of modal analysis and proper orthogonal decomposition applied to the loading process. By adopting this method the structural response is expressed as a double series expansion in which structural and loading mode contributions are superimposed. The simultaneous use of the structural modal truncation, the loading modal truncation and the cross-modal orthogonality property leads to efficient solutions that take into account only a few structural and loading modes. In addition the physical mechanisms of the dynamic response are clarified and interpreted.
Galloping of overhead transmission lines in gusty wind
Ohkuma, Takeshi ; Marukawa, Hisao ;
Wind and Structures, volume 3, issue 4, 2000, Pages 243~253
DOI : 10.12989/was.2000.3.4.243
To develop galloping suppression devices, it is important to understand the effects of wind turbulence on galloping and to establish an evaluation method which takes `large conductor deformations` into account. This paper introduces some findings on galloping in gusty wind obtained by numerical simulation using a model based on the Mogami Test Line of the Tokyo Electric Power Co. The equations of motion of the conductor are based on the Lagrangian formulations by Simpson, and they are made discrete in accordance with a finite element method.
Generalization of wind-induced interference effects for two buildings
Khanduri, Atul C. ; Stathopoulos, Theodore ; Bedard, Claude ;
Wind and Structures, volume 3, issue 4, 2000, Pages 255~266
DOI : 10.12989/was.2000.3.4.255
Wind-induced interference effects on a building are the result of one or more adjacent buildings modifying the flow of wind around it, which may result in a significant increase or decrease in wind loads on the building. Wind loading standards and codes of practice offer little guidance to the designer for assessing the effects of interference. Experimental results on interference effects indicate that code recommendations may be significantly low (unsafe) or uneconomically conservative. The paper presents results of an extensive experimental program to study the wind flow mechanisms and to quantify the extent of wind load modifications on buildings due to interference effects. These results have been simplified and presented from the point-of-view of design and codification for the case of two buildings. Based on these results, general guidelines and limiting conditions defining wind interference are formulated and discussed.
Recent topics on bridge aerodynamics
Matsumoto, Masaru ; Shirato, Hiromichi ; Yagi, Tomomi ;
Wind and Structures, volume 3, issue 4, 2000, Pages 267~277
DOI : 10.12989/was.2000.3.4.267
This paper aims to describe the aerodynamic vibrations of various structural elements of bridges, which are particular issues at present. The aerodynamic countermeasures for those vibrations are also discussed considering the generation mechanisms of the aerodynamic instabilities. In this paper, an example of vortex-induced oscillation of bridge deck and its lesson are discussed. Next, the wind-induced cable vibration and its aerodynamic countermeasures are reviewed. Then, the aerodynamic characteristics on two edge girders and their feasibility for application to long span cable-stayed bridges are considered. Furthermore, the bridge decks for future long span bridges are proposed and their aerodynamic characteristics are also discussed.
Wind load combinations and extreme pressure distributions on low-rise buildings
Tamura, Yukio ; Kikuchi, Hirotoshi ; Hibi, Kazuki ;
Wind and Structures, volume 3, issue 4, 2000, Pages 279~289
DOI : 10.12989/was.2000.3.4.279
The main purpose of this paper is to demonstrate the necessity of considering wind load combinations even for low-rise buildings. It first discusses the overall quasi-static wind load effects and their combinations to be considered in structural design of low-rise buildings. It was found that the maximum torsional moment closely correlates with the maximum along-wind base shear. It was also found that the instantaneous pressure distribution causing the maximum along-wind base shear was quite similar to that causing the maximum torsional moment, and that this asymmetric pressure pattern simultaneously accompanies considerable across-wind and torsional components. Secondly, the actual wind pressure distributions causing maximum quasi-static internal forces in the structural frames are conditionally sampled and their typical pressure patterns are presented.
A new ALE finite element techniques for wind-structure interactions
Choi, Chang-Koon ; Yu, Won-Jin ;
Wind and Structures, volume 3, issue 4, 2000, Pages 291~302
DOI : 10.12989/was.2000.3.4.291
A new finite element technique to solve the problem of wind and structure interactions is presented. Conventionally, wind analysis is performed on the Eulerian description in which the finite element mesh would not move in accordance with the wind flow. However, it is not the case in wind-structure interaction problems because nodes attached to the surface of structure should move with the displacement of structure. The arbitrary Lagrangian-Eulerian (ALE) method treats the mesh and flow independently, and allow the mesh to move. In this study, the analysis domain is divided into regions of the structure, air around the structure and the interface of two regions. To satisfy the compatibility and equilibrium conditions between separated regions and to carry out the efficient analysis, the rigid link is used. Also the equation of wind and that of structure are arranged in a single matrix equation.