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In this paper, a simple  formulation  for current application  for the axial compressive strength determination  of  hot  rolled  circular  hollow  steel  sections,  with  sinusoidal  form  initial crookedness and values of the central deflection between 1/2,000 and 1/500 of the length, is proposed. In order to validate the analysis, several numerical models were generated by finite element method, considering members with 1/1,000 of the length initial crookedness, and the results were compared with the values obtained by EN 1993‐1‐1:2005. Using the methodology of modeling validated, many other members with initial crookedness of 1/2,000, 1/1,500, 1/750 e 1/500 of the length were analyzed, allowing to obtain the values of the reduction factor, , as a function of the reduced slenderness parameter,  ̅. The values of  of members with  initial crookedness between these two limits were evaluated by polynomial interpolation.

Axial compressive strength determination of hot rolled circular hollow steel sections with initial crookedness between 1/2,000 and 1/500 of the length