Equivalent lengths of struts (for use in buckling calculations).
Abstract:ESDU 92038 gives equivalent lengths that may be used in place of the true length in the Euler buckling equation for a uniform section strut pinned at both ends, so taking account of end conditions and loading type in the assessment of the buckling load of practical struts having initial bow and offset loading. The equivalent lengths are provided for a wide range of end conditions for uniform section struts, struts tapered continuously or tapered at both ends with a uniform section centre portion. They are also given for struts with an intermediate support at which the strut is pinned and there may also be a step section change, and for struts with an intermediate elastic support.. The loadings include simple end loads and axially distributed loadings that vary linearly or to a power law; they may be conservative (fixed in direction) or non-conservative (tangential to the strut axis). Non-conservative distributed loads that are reacted by a conservative load at one or both ends are also included. The special case of a cantilevered uniform section strut that is clamped and has a direct loading inclined to the strut axis acting through a point on the neutral axis is treated. The equivalent length for dynamic buckling under a non-conservative loading is also given.
|Data Item ESDU 92038|