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Difference in wind load definition in staad

 
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sureshm_civil
SEFI Member
SEFI Member


Joined: 04 Oct 2013
Posts: 1

PostPosted: Fri Mar 21, 2014 5:22 pm    Post subject: Difference in wind load definition in staad Reply with quote

can any one suggest me what the difference

1)applying wind load manually by calculating the wind load (apply as member load)

2)wind load definition by staad

whether manual application is conservative
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lalitv74
SEFI Member
SEFI Member


Joined: 21 Mar 2014
Posts: 6

PostPosted: Sat Mar 22, 2014 6:19 am    Post subject: Reply with quote

Hey let me show you the proper way of calculating wind load
High winds can be very destructive. The speed of the wind--or wind velocity--acts as pressure when it meets with a structure. The intensity of that pressure is the wind load. Calculating wind load is necessary for the design and construction of safer, more wind-resistant buildings. There are many factors that need to be considered when calculating wind load, so see Step 1 below to get started.

All of this information is brought to you by Verma Dies Exports
please leave comment if you want to know more i will help off of those who are in need.
Lalit Verma



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7. Ce is a number taken from a table with three terrain exposures with various heights and Ce values for each.
>> Cq is the pressure coefficient or the drag coefficient.
>> Qs is the wind stagnation pressure, taken from another UBC table.
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6. Consider the UBC '97 formula, which is the 1197 version of the Uniform Building Code for wind calculation for load. The formula is the load or force in the area of the item by the wind pressure. The difference is that wind pressure (Psf) is calculated
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5. Use a newer version of the formula developed by the Electronic Industries Association, F = A x P x Cd X Kz x Gh. This formula also factors in:
>> Kz, which is the exposure coefficient calculated by [z/33]^(2/7) where z is the height from the grou
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4. Calculate wind load or force with the general formula of F = A x P x Cd. Multiply the area by wind pressure and by drag coefficient.
>> F is force.
>> A is the area.
>> P is the wind pressure.
>> Cd is the drag coefficient.
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3. Compute the drag coefficient. Drag is the pressure an object is subject to. One of the factors that determines drag is the drag coefficient, which is due to the shape and other factors of the object. The following drag coefficients are used in calculat
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2. Find the value for wind pressures with the formula, wind pressure (Psf) = .00256 x V^2.
>> V is the wind speed in miles per hour.
>> An alternative to calculating for wind pressure at a particular wind speed is to use the standard for vario
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1. Know that wind velocity varies at various distances from the ground
>> Wind speed increases with structural height.
>> Wind velocity is most unpredictable closer to the ground, because it is affected by interacting with things on the ground
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md zeeshan ali
SEFI Regulars
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Joined: 12 Nov 2013
Posts: 36

PostPosted: Sat Mar 22, 2014 12:34 pm    Post subject: difference between manual and STAAD.Pro wind load Reply with quote

DEAR SIR,
STAAD.pro has no option for calculating the wind load according to IS 875:2003-part:3. STAAD.pro can calculate only according to the Russian and American codes( ASCE 7:10 and previous version).
For applying the Indian code you have to use "custom option" and manually enter the wind intensity and their respective heights. And STAAD.pro apply these loads on the nodes,  not on the column or beam.

so, as far as you apply the manual load on the nodes as per STAAD.pro yo will  get very minor difference in the results.
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