The Wood method, also known as the Merchant–Rankine–Wood method, is a structural analysis method which was developed to determine estimates for the effective buckling length of a compressed member included in a building frames, both in sway and a non-sway buckling modes. It is named after R. H. Wood. According to this method, the ratio between the critical buckling length and the real length of a column is determined based on two redistribution coefficients, η 1 {\displaystyle \eta _{1}} and η 2 {\displaystyle \eta _{2}} , which are mapped to a ratio between the effective buckling length of a compressed member and its real length. The redistribution coefficients are obtained through the following expressions:
η i = K c + K i K c + K i + K i 1 + K i 2 , i = 1 , 2 {\displaystyle \eta _{i}={\frac {K_{c}+K_{i}}{K_{c}+K_{i}+K_{i}1+K_{i}2}},\quad i=1,2}
where K i {\displaystyle K_{i}} are the stiffness coefficients for the adjacent length of columns. Although this method was included in ENV 1993-1-1:1992, it is absent from EN 1993-1-1.
See also EN 1993 Merchant–Rankine method Horne method
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