Postbuckling behavior of infinite beams on elastic foundations using Koiter's improved theory (Q1099675)

This study deals with the postbuckling behavior of infinite beams on nonlinear elastic foundations subjected to axial compression. The analysis utilizes an improved Koiter postbuckling theory such that the postbuckling coefficients are evaluated at the actual applied load rather than at the classical buckling load. The improved postbuckling paths are found to agree well with the nonlinear large deflection solution using the Ritz procedure. This paper substantiates Koiter's conjecture that the general theory of elastic stability may be improved. The implications of various lower-bound buckling loads are examined.