Resistance Parameters Statistics for Jacket Platforms in Offshore Malaysia

This paper forms a part of the work on the reliability based calibration
of load and resistance factors for design of offshore jacket platforms in
Malaysia. The statistical parameters for the resistance of structural
members of platforms are discussed here. The data is obtained from ten
platforms which were fabricated in Malaysia for Offshore Malaysia.
Resistance capacity of structural members must be equal to or greater
than the action of external loads. Resistances depend upon material
property, geometric dimension of structural members and the model for
resistance, all of which are sources of randomness. The mean
coefficient, variation coefficient and type of distribution for
geometrical parameters (diameter, thickness, length) and material
parameters (yield strength, Young’s modulus and tensile strength) are
presented. This data is compared with the data available in literature.
The expressions for the stresses and stress combinations namely axial
tension, axial compression, bending and tension combined with and
without hydrostatic pressure, axial compression and bending with and
without hydrostatic pressure, and shear resistance are available in ISO
19902. The statistical parameters of the first four are determined. These
values are also compared to the values available in literature.