Analysis of Column Collapse for Advanced Offshore Design
نویسنده
چکیده
In modern offshore installations, thin walled columns are used for energy absorption in accident situation. 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 prediction of accurate collapse curves of square section column under axial impact load. New formulations for square section tube collapse with respect to contributions from hinge curvature, strain hardening, second force oscillation and sensitivity to imperfection are presented. The behavior of a column in dynamic load is investigated using a simplified model of an offshore impact with dynamic corrections including strain rate modeling. Good agreement between experimental and theoretical loaddisplacement and velocity-time curves verifies the accuracy of the proposed formulation
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