Wood method

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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.[1][2] 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, and , 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:

where 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[edit]


  1. ^ Wood, R. H. (1974). "Effective Lengths of Columns in Multi-Storey Buildings. The Struct. Eng., Vol. 52, 7,". pp. 341–346. 
  2. ^ Simões, Rui (2007). Manual de Dimensionamento de Estruturas Metálicas. CMM – Associação Portuguesa de Construção Metálica e Mista. p. 119. ISBN 978-972-98376-9-2.