I have come unstuck in my dissertation, and cannot find any information/equations for the effects of shielding on wind loading in a structure (This is not an ordinary structure, it is an unsymmetrical sculpture made up of circular and Universal beams). So i would firstly like to find how the distance between beams affects the wind loading (the shielding) in the downwind beam - and any further downwind beams-. I need this for circular and non- circular sections. Any help on this topic would be greatly appreciated, as there has been many months of fruitless searching. Many thanks.