ON THE BUCKLING OF SLENDER PILES

概要

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The published analyses of axially loaded piles are based on the notion that the buckling load is P_<cr> ; the so-called critical load that is obtained from a linear eigenvalue problem. The purpose of this paper is to show that generally this assumption is not justified for slender piles. Since the main aim of the presentation is to clarify the basic features of the pile buckling phenomenon, and to show how they are related to the various buckling analyses, this study is conducted on a simple model that exhibits the essential buckling mechanism of the pile but is amenable to an exact non-linear analysis. One presented analysis is based on the common assumption that the lateral soil resistance increases linearly with the lateral displacement. It shows that P_<cr> may, or may not, be the true buckling load depending on the lateral stiffness of the soil and the bending stiffness of the pile. Thus, in some cases the buckling load has to be established from a non-linear analysis. Another analysis assumes that the lateral resistance stiffens non-linearly with increasing pile displacements. It shows that if the stiffening effect is strong enough, P_<cr> may be considered as the buckling load. Thus, for the stability analysis of slender piles, the actual soil response to lateral pile displacements is needed.
社団法人地盤工学会の論文
1988-06-15