Helideck design

Project:www.sefindia.org
Component:Miscellaneous
Category:support request
Priority:critical
Assigned:gvcsekar
Status:active
Description

Dear All,
I'm designing Helideck for Offshore platform...
I''m considering 3 types of helicopter loads to the structure.
1.Helicopter at rest with wind operating and storm condition.
-4 wheels at a time (22% for fore & 78% for aft weight distribution
2.Helicopter at Heavy landing with wind operating and storm condition.
-2 wheels at a time (1.5 factor)
3.Helicopter at Emergency landing with wind operating and storm condition.
-2 wheels at a time (2.5 factor).

I have given one-third increse of stresses to storm condition... But members are failing for this standard type of helideck... Is there any additional increase of stresses that I have to be given? Is there any refernce for increse of stresses for these 3 conditions... Kindly reply me...

Regards,
Chandrasekar. V