Dear Friends,

I have PVElite 2007 With march Built.
I am facing problem While Calculating Wind load in IS875 with Gust Factor methed.
PVElite considers factor 'K2' from table-2 (Which is used for static loading due to load in Section:5 & 6), But as per IS875 Sec:8, factor 'K2' shuld be from Table-33 While considering Gust Factor & HMW.

Please Clearify.

Hirak R Gayakwad

Hirak,

The gust effect factor G is computed per IS-875 (Part 3 ) 1987 per paragraph 8.3. The equation for G is [1.0 + gfr * (B * (1 + phi)² + (Sope * Eope) / ßope)**½]. As you can see G is a function of several variables and graphs including figures 8, 9, 10 and 11. Experience had shown that this factor is very conservative and can increase wind loads by a factor of 2 or more. When designing tall vessels, this may be overly conservative. This calculation as you may have noted is optional. You can use the wind load scalar to increase the wind load by a factor that is agreeable to all parties who have an interest in the vessel.