Abstract: This paper discussed several issues in the design of leg supports for vertical vessels. It first conducted a detailed analysis of the forces acting on the leg supports and derived the calculation formula for the vertical load imposed by bending moments. Meanwhile, through rigorous geometric derivation, the precise solution formula for the bolt circle diame-ter D_b—a parameter essential for vertical load calculations in leg-type supports—has been obtained. Corresponding auxiliary calculation software was also developed using the Visual Basic.NET language. Additionally, it identified specific errors within the SW6—2011 v5.0 calculation software. This study can provide valuable references for designers to better understand leg support calculation methods and conduct non-standard leg support design.

Key words: leg supportlnon-standard designlmaximum vertical loadlseismic loadlanchor bolt circle diameterlexact solutionlsoftware development