English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In modern offshore installations, thin walled columns are used for energy absorption in accident situations. When this advanced offshore shock absorber is subjected to axial compressive load, plastic hinges are developed on the sides of column and the column crushes with repeatable patterns. It can absorb considerable impact energy due to large and continuous plastic deformation. This paper develops a new closed form, energy based, solution for the prediction of accurate collapse curves of plastic folding of square section columns under axial impact load. New formulations for square section tube plastic folding, with respect to contributions from hinge curvature, strain hardening, second force oscillation and sensitivity to imperfection, are presented. The behaviour of a column in dynamic load is investigated using a simplified model of an offshore impact with dynamic corrections, including strain rate modelling. Good agreement between experimental and theoretical load-displacement and velocitytime curves verifies the accuracy of the proposed formulation.

New analysis of square section column plastic folding under axial impact for offshore shock absorbers