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Difference Between Wind And Seismic Forces

 
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abhy_vivek
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PostPosted: Wed Aug 17, 2011 6:33 am    Post subject: Difference Between Wind And Seismic Forces Reply with quote

Difference Between Wind And Seismic Forces

    My colleague Mr. Aravind Ashok has prepared a document titled 'Difference Between Wind And Seismic Forces', which is enclosed herewith. Hope all of you will find it intersting.

To improve this document give suggestions to Aravind or Undersigned Directly

With Regards

Er. Vivek Abhyankar - C.Eng
स्थापत्य तथा वास्तुअभियंता
Mumbai-400053



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pradeep_hebbar
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PostPosted: Wed Aug 17, 2011 9:16 am    Post subject: Re: Difference Between Wind And Seismic Forces Reply with quote

Dear Er.Vivek,

That was a very nice & useful information!!



Pradeep Hebbar
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sakumar79
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PostPosted: Wed Aug 17, 2011 3:20 pm    Post subject: Reply with quote

Dear Sir,

  Very good compilation... Some minor corrections and additional points are there:


Minor Corrections:

1. In point no. 5, "Base shear value" may be corrected as "shear force" or "contribution of base shear value at a floor". Base shear value is constant, the shear force attracted at each floor level is varying.

2. In point no. 9, for wind load, "Wind load doesnt cause torsion in a structure" is not exactly correct. Wind load can cause torsion in a structure depending on the nature of exposed surface and the supporting mechanism. For example, if a hoarding is placed over a beam along its length, there will be torsion induced on the beam.



Additional points:


1. Wind load is designed for full amount of maximum estimated wind force in a specified duration but eq forces design is for a fraction of the estimated eq force

2. Effect of wind load is expected to be within elastic behaviour whereas ductility/plastic behaviour is essential to eq design

Arun
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anshugoel
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PostPosted: Wed Aug 17, 2011 7:21 pm    Post subject: Reply with quote

sakumar79 wrote:
Dear Sir,

  Very good compilation... Some minor corrections and additional points are there:


Minor Corrections:

1. In point no. 5, "Base shear value" may be corrected as "shear force" or "contribution of base shear value at a floor". Base shear value is constant, the shear force attracted at each floor level is varying.

2. In point no. 9, for wind load, "Wind load doesnt cause torsion in a structure" is not exactly correct. Wind load can cause torsion in a structure depending on the nature of exposed surface and the supporting mechanism. For example, if a hoarding is placed over a beam along its length, there will be torsion induced on the beam.



Additional points:


1. Wind load is designed for full amount of maximum estimated wind force in a specified duration but eq forces design is for a fraction of the estimated eq force

2. Effect of wind load is expected to be within elastic behaviour whereas ductility/plastic behaviour is essential to eq design

Arun


The author is pretty much inaccurate on point 20 to 24 for Wind effect.

There was a recent accident where 4 lives were lost due to wind effect (allegedly).

http://articles.cnn.com/2011-08-13/us/indiana.stage.collapse_1_stage-collapse-wind-gust-sugarland?_s=PM:US

I have also frequently experienced that weather guys get it very much wrong - in no time - thunder become severe thunder storm which escalates to Tornado warning with hail and other accompaniments.

This is quite common in the area where I live. So even with the best of technology - like with doppler radar and most advanced data collection instruments in place, weather forecasting goes wrong quite often - Many people die. Another recent example is Joplin, MO where entire community was wiped out.
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raveeleo
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PostPosted: Fri Aug 19, 2011 8:45 am    Post subject: Re: Difference Between Wind And Seismic Forces Reply with quote

really a very helpful....

convey the same to your friend.. and thank you for Thanks for Sharing...

ravee
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rohan_borges
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PostPosted: Sat Aug 20, 2011 1:22 pm    Post subject: Correction. Reply with quote

In the document sumbmitted by Mr. Arvind Ashok he says that "amongst
which the seismic force and the wind force are the common ones"
Wind forces are quite common. But earthquake is not very common though it is significant.
     The remaining part of the document is very well presented and quite useful.

Rohan Borges
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syedmuzaffer
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PostPosted: Mon Aug 22, 2011 6:45 pm    Post subject: Reply with quote

Very nice and informative...
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