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Evaluation of Pile Friction from Conductor Tests

H. G. Poulos / M. F. Randolph / R. M. Semple

The paper considers the results of load tests performed on conductor pipes installed at North Rankin 'A' offshore gas platform, with a view to evaluating the likely shaft capacity of the main driven piles. The average skin friction values measured from the conductor tests range from close to 20 kPa, down to as little as 4 kPa for a conductor that had been tested, redriven and then tested again. The low skin friction values are exacerbated by the slender nature of the conductor pipes and by the tensile direction of loading. Allowing for these factors, the average skin friction available to the main piles under monotonic loading is estimated as about 20 kPa. However, that value is liable to significant reduction under the action of cyclic loading.

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Evaluation of Pile Friction from Conductor Tests

H. G. Poulos / M. F. Randolph / R. M. Semple

The paper considers the results of load tests performed on conductor pipes installed at North Rankin 'A' offshore gas platform, with a view to evaluating the likely shaft capacity of the main driven piles. The average skin friction values measured from the conductor tests range from close to 20 kPa, down to as little as 4 kPa for a conductor that had been tested, redriven and then tested again. The low skin friction values are exacerbated by the slender nature of the conductor pipes and by the tensile direction of loading. Allowing for these factors, the average skin friction available to the main piles under monotonic loading is estimated as about 20 kPa. However, that value is liable to significant reduction under the action of cyclic loading.

Evaluation of Pile Friction from Conductor Tests

H. G. Poulos / M. F. Randolph / R. M. Semple

The paper considers the results of load tests performed on conductor pipes installed at North Rankin 'A' offshore gas platform, with a view to evaluating the likely shaft capacity of the main driven piles. The average skin friction values measured from the conductor tests range from close to 20 kPa, down to as little as 4 kPa for a conductor that had been tested, redriven and then tested again. The low skin friction values are exacerbated by the slender nature of the conductor pipes and by the tensile direction of loading. Allowing for these factors, the average skin friction available to the main piles under monotonic loading is estimated as about 20 kPa. However, that value is liable to significant reduction under the action of cyclic loading.

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Title:

Evaluation of Pile Friction from Conductor Tests

Contributors:

H. G. Poulos (author) / M. F. Randolph (author) / R. M. Semple (author)

Publication date:

1988

Size:

21 pages

Type of media:

Report

Type of material:

No indication

Language:

English

Keywords:

Ocean Sciences & Technology , Structural Analyses , Offshore structures , Pile structures , Friction piles , Pipes(Tubes) , Failure , Loads(Forces) , Static tests , Foreign technology , Conductors , Tapile computer program

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