Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/6296
Title: ANALYSIS OF TALL BUILDINGS UNDER WIND LOADING
Authors: Sarraf, Shakti
Keywords: CIVIL ENGINEERING;FLUCTUATION PRESSURE;TALL BUILDING;WIND LOAD
Issue Date: 1995
Abstract: Under the influence of dynamic wind loads, typical high-rise buildings vibrate in the along-wind and across-wind directions. The along-wind motion primarily results from pressure fluctuations on the windward and leeward faces, which generally follow the fluctuations in the approach flow, at least in the low frequency range. The across-wind motion is introduced by pressure fluctuations on the side faces which are induced by the fluctuations in the separated shear layers and wake flow fields. Modern high-rise buildings designed to satisfy static lateral drift requirements, still may oscillate excessively during wind storm. The level of these oscillations may not be significant enough to cause structural damage but may cause discomfort to the occupants. So an accurate assessment of building motion is an essential perquisite for serviceability. Such an exercise ensures that the building remain functional under normal loading conditions. Extreme loading conditions resulting from dynamic wind effect are needed for the structural integrity. The aerodynamic loads in strength design to ensure along-wind direction are quantified analytically utilizing quasi-steady and strip theories. The dynamic effects are customarily represented by "Gust Factor Approach" in which, three spectra namely, Davenport, Kaimal and Harris have been used. Lack of convenient transfer function, between the velocity fluctuations in the incident turbulence and the pressure fluctuations on the side faces of a building with separated flow, has prohibited any acceptable (vi) formulation of the across-wind loads on structures. Hence, the curve relating these two , developed by Kareem and Saunders are digitized and used in analysis. These methods include a number of parameters on which the response of building depends (i.e. Height, depth and cross-section of buildings, Terrain turbulence etc.). These parameters are varied over a practical range, and the response is computed, for both along-wind and across-wind conditions in the first mode of vibration.
URI: http://hdl.handle.net/123456789/6296
Other Identifiers: M.Tech
Research Supervisor/ Guide: Kumar, Krishen
Krishna, Prem
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (Civil Engg)

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