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Wind effects on tall building frames

 
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B.V.Harsoda
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PostPosted: Tue Nov 20, 2012 1:38 pm    Post subject: Wind effects on tall building frames Reply with quote

Wind Effects on tall building frames-influence of dynamic parameters


B. Dean Kumar
1
and B.L.P. Swami
2
1
Department of Civil Engineering, JNTU College of Engineering, Hyderabad-500085, India
2
Department of Civil Engineering, Vasavi College of Engineering, Ibrahim Bagh-500031, India
deankumar@yahoo.com

Abstract
In the recent past many tall buildings and high rise towers are being built in India. The impact of wind loads are to be considered for the design of these towers on par with steel towers like transmission towers, microwave towers, cooling towers and very tall multistoried building towers. Several failures of structures have occurred in India due to wind. The IS 875 Part-3 deals with wind loads on different types of structures. In the present work,the  Gust  Effectiveness  Factor  Method  is used ,which is more  realistic  particularly  for  computing  the wind  loads  on  flexible  tall  slender  structures and   tall  building towers. In this paper frames of different heights are anlaysed and studied

Source Link:-
http://www.indjst.org/archive/vol.3.issue.5/may10deankumar-18.pdf

Regards,
Er. B. V. Harsoda
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thirumalaichettiar
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PostPosted: Tue Nov 20, 2012 2:54 pm    Post subject: Reply with quote

Dear Er.Harsoda,

May I request you to place all these references under BOOKS and References so that it will be put under one head so that any one wishes to read or study go in continuously without searching the links.

If it is possible do it>

T.RangaRajan.
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B.V.Harsoda
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Joined: 19 Jan 2009
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Location: RAJKOT,GUJARAT, INDIA

PostPosted: Tue Nov 20, 2012 6:21 pm    Post subject: Reply with quote

Dear Sir,
I have found  network problem in Reply so I have reply as new topic earlier.
http://www.sefindia.org/forum/viewtopic.php?t=13170

Regards,
Er. B. V. harsoda

thirumalaichettiar wrote:
Dear Er.Harsoda,

May I request you to place all these references under BOOKS and References so that it will be put under one head so that any one wishes to read or study go in continuously without searching the links.

If it is possible do it>

T.RangaRajan.
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Dr. N. Subramanian
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PostPosted: Wed Nov 28, 2012 8:05 pm    Post subject: Effect of Hurricane Ike on 75-story JP Morgan Chase Tower Reply with quote

Effect of  Hurricane Ike on 75-story JP Morgan Chase Tower, formerly Texas Commerce Tower, at 600 Travis Street in downtown Houston, Texas.
On September 13, 2008, many of the tower's windows were blown out as Hurricane Ike moved through the area leaving desks exposed, metal blinds hanging in a twisted heap and smoky black glass covering the streets below. Police were forced to cordon off the area due to the amount of debris lying in the streets.

At first, it was speculated that the glass came off the building due to impact from debris or due to high-speed winds in the confined spaces. However, flying glass debris must be entirely governed by drag and lift forces that overcome gravity for a considerable time period. Also, the high speed in confined spaces theory is not entirely justified since the height of damage seen in the tower exceed too significantly the height of the Chase Center parking garage next to the tower. This theory was proposed because an increase in wind speed produce a drop in external pressure in the side and leeward walls and the pressure inside the building remained normal (high) thus resulting in a force that would overcome design pressures. Other interesting observations include those of ABS Consulting engineers who suggest that glazing damage may have been produced by "organized" vortices produced by the upwind Calpine Center and steady vortices between the Tower and the Chase Center parking garage.

The NatHaz Modeling Laboratory at the University of Notre Dame is currently conducting an investigation of the flow field around the structure, modeling the tower and the immediate area surrounding it using Computational fluid dynamics (CFD).

Preliminary findings suggest that the localized damage is the result of a confluence of multiple mechanisms arising from the arrangement of nearby buildings, critical flow directionality and the possible entrapment of debris within evolving flow structures.
Source: http://en.wikipedia.org/wiki/JPMorgan_Chase_Tower_%28Houston%29
See also:

  • http://www.absconsulting.com/resources/Catastrophe_Reports/HurricaneIke_ChaseTower.pdf
  • http://www.nd.edu/~nathaz/doc/NATHAZ_Ike_Glass_Dmg.pdf


A FEMA Report is enclosed!



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