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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)

ISSN:2141-7016

Article Title: EMERGING TRENDS IN ENGINEERING AND TECHNOLOGY ON THE USE OF EIFFEL TYPE WIND TUNNEL FOR THE ASSESSMENT OF A RIGID BRACED FRAMED MULTI-STOREY BUILDINGS SUBJECTED TO WIND INDUCED MOTION
by L.O.Onundi

Abstract:
Dimensional analysis has been successfully applied to investigate multi-storey building subjected to wind induced motion. Although many Scholars earlier applied same; but such solutions did not include the influence of the structures deflection (?). The research work show that single or composite materials can be used to construct a model for testing the multi-storey buildings to investigate the relevant structural parameters under laboratory conditions; on condition that, the physical and mechanical properties are known. It also uses miniaturized model sizes that are simple to machine, construct, safe, effective and portable enough for the laboratory investigation of aerodynamically induced structural systems. It is therefore flexible, economical and supportive of researches on human resource and sustainable developments goals; as the models can easily be constructed by students, lectures, researchers and practicing engineers to support their teaching, research and various investigative or practical requirements at very low cost. In assessing the factors that influences the human comfort criteria most especially at the topmost floors; it was discovered that dynamic models of 72m and 100m gave accelerations of 186.174 ms-2 and 178.825 ms-2 which are respectively less than 250-294 ms-2 (i.e. < 3 milli-g). The velocity for 72m was 553.5ms-1 while 100m was 726 ms-1 which is 21% higher than the limiting value of 600 ms-1 conventionally recommended as upper limit to prevent norcia and phobia due to excessive vibration at the topmost floors of a tall building. Similarly, when the base moments for the BS 6399 (2005) and MOIP were compared with the result of the physical model; the differences were +5.07% and -0.81% respectively which are within acceptable limits. Therefore, the lesson learnt conforms to the conventional norm; that a braced rigidly framed steel multi-storey building should not exceed 25 storeys. Therefore, it was suggested that, in other to enhance the general stability, reliability and economy of a multi-storey building, it may be necessary to encourage an improved architectural and structural efforts to either reduce the model mass close to the top by reducing the model general dimensions, fluid-structure interaction or strengthen and stiffening by pre-stressing dynamic part of the structural system.
Keywords: dimensional analysis; strouhal number; bernoulli universal constant; wind tunnels; multi-storey buildings; aero-elastic damping; human comfort criteria.
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom

 

 

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