Load-bearing behaviour wind suction loads

Principal load-bearing behaviour of a two-layer cushion under wind suction (according to Moritz and Schiemann (2008)). 

The reverse of wind suction load is snow load. Snow pushes the outer layer down and the sag and forces in the outer layer are decreased. The inner layer will be strained under increasing internal pressure from snow load, sag, and forces will increase, too. Especially for high snow loads, the inner layer has to be supported by cables. Rgure 6.33 shows the principal load-bearing behaviour under snow load. 

---