In response to the industry’s call for onboard use of a fast nonlinear analysis for on-deck container stacks, ABS developed a simplified analysis procedure and associated software. The procedure accounts for the nonlinearities due to twistlock clearances by modifying the linear solution while maintaining the equilibrium of stack forces. The results of the simplified procedure are in a very good agreement with the fully nonlinear analysis results for common external lashing patterns. The simplified procedure is iteration-free and provides a practical solution suitable for onboard use.

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