Case Histories in Offshore Engineering, 1st Edition by G. Maier (eds.)

By G. Maier (eds.)

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Extra resources for Case Histories in Offshore Engineering, 1st Edition

Sample text

Tions should be taken into account. 'Ibis was the case with "Alexander L. Kielland". ima and the natural period of the system. 02 s. ima. 6. These findings substantiate the conc1usions of the previous section regarding over1oad fai1ure of braces after the fracture of the D6 brace. 38 T. Moan

Np:>rtance of the actual area - and to inadequate thorooghness of the the required inspections. mich were mt inspected. Only the rnajor inspection every foorth year seemed to have a potential of detecting cracks, if looked for. But it is mt even likely that the hydrcphone support area \\Ollld have been included in the rnajor inspection of Alexander L. Kielland 11 11 that was due, because there was no evidence regarding predicted crack praneness or cracks experienced before the Alexander L. Kielland" accident to suggest attention to 11 these welds cxxrpared to the nany kilareters of other welds in the platfonn.

Nanina1 stress, O'n in the brace at various positions 9 ( see fig. 10) along the hydrcphone support we1d on the inner side of the brace p1ating. Stress CCA'lpOnent1) Pos. 2 1)For the case of an intact we1d, stresses were ca1cu1ated at a position oorresponding to the toe of the we1d. For a (catpletely) cracked we1d stresses were ca1cu1ated at the edge of the cut-out. L. Kielland Platform Also, a three-dirnensional FEM ITOdel was applied for the case with intact fillet welds, using solid elements in the vicinity of the hydrophooe su:wort, arrl thick-shell elerents for the remaining of the brace.

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