The parameters for tubular members of offshore structures are yield stress, strain hardening, Young’s modulus, residual stresses, section parameters (diameter and thickness), out of roundness of the section and out of straightness of the member. Comparing API LRFD and ISO, the average reduction in combined axial tension and bending capacity of ISO was observed to be 9%; for axial compression, bending and pressure, the average reduction in ISO was found to be 7%; while for combined tension, bending and pressure, the ISO formulation showed increase of capacities of 10%.

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