Studies were initiated for a simplified design procedure for ultimate limit state of hyperbolic cooling tower（HCT）shell

which considersvarious wind directions at present.The internal forces due to each load

especially the wind load

are simplified based on the analysis of internal forces under every single load of a HCT

including their dominating internal forces and their latitude distributions.Then a simplified reinforcement calculation procedure is proposed on the basis of axisymmetrical design principle.Compared with the conventional method

this simplified one can not only avoid the combination calculation of load directions

but also avoid reinforcement calculation in the whole latitude.For a certain height

just one group of internal forces is needed for the final reinforcement calculation.So

the computational effort is greatly reduced with just slight increase of reinforcements.