.... Then the monitoring data obtained during vibro driving were used adjust the soil model used for the initial simulation and to derive the pile capacity. Next the monitoring data for the Beginning of Restrike and the End of Impact Driving were used to assess the capacity yet again. The results as well as the soil...

... with an underwater impact hammer, or vibratory hammer, and are used for mooring floating structures. This paper presents a methodology to carry out a back analysis of mooring pile capacity based on pile driving data. The process involves two stages, the first is to assess the self-weight penetration of the pile...

... and in clay. Probabilistic calculations of the axial pile capacity for typical offshore piles using the above five design methods (API, Fugro, ICP, NGI and UWA methods) showed that method uncertainty is a major contributor to the uncertainty in pile foundation capacity. The method uncertainty has therefore...

... for fixed foundations and mooring anchors in API RP 2GEO and DNV. The static method of computing axial pile capacity described in API RP 2GEO (2011) is generally used to compute ultimate compressive and tensile capacities of pipe piles driven to a given penetration. Lateral soil resistance –pile deflection...

... life for the in-place conditions. weld in-place condition stress concentration factor calculation sn curve compressive stress butt weld upstream oil & gas fatigue life penetration subsea system offshore technology conference scf pile capacity pile section wall thickness...

..., taking into account the uncertainty in loads and pile capacities, is presented here as a basis for assessing wind turbine foundation reliability. For an example tripod structure in the North Sea, the annual probability of failure achieved with different design standards ranges over more than two orders...

... Presentation of OTC-24063-MS Presentation of OTC-24063-MS OTC 24063 Reliability of API, NGI, ICP and Fugro Axial Pile Capacity Calculation Methods S. Lacasse, F. Nadim, K. H. Andersen, Siren Knudsen, Unni K. Eidsvig, Norwegian Geotechnical Institute (NGI), Gülin Yetginer, Tom R...

... OTC 22983 The Effect of Grain Shape on Pile Capacity in Sand Robert F. Stevens, Fugro-McClelland Marine Geosciences, Inc. Copyright 2012, Offshore Technology Conference This paper was prepared for presentation at the Offshore Technology Conference held in Houston, Texas, USA, 30 April 3 May 2012...

... empirical design methods has been demonstrated through database studies, such as that conducted by Briaud and Tucker (1988), with measured and predicted pile capacities differing by up to 60%. It is worth noting that reliability studies of this type only consider the uncertainty in the design method...

... api percussion-sampling technique pile capacity undrained shear strength percussion 2 percussion boring termination depth api 2000 seafloor shear strength site investigation axial pile capacity upstream oil & gas otc 19569 capacity ratio interpretation foundation design...

... probabilistic approach risk assessment gilbert platform reserves evaluation engineering pipeline hurricane risk and uncertainty assessment drilling operation management chemical spill information pile foundation pile capacity risk management technology conference lower-bound...

... on six plain driven piles to measure variations in shaft resistance with time, and also to examine cyclic loading effects. Introduction The GOPAL project is investigating a new technology to increase pile capacity in sands. Jet grout bulbs are created below the toe of conventional driven steel piles...

... in pile capacity resulting from the lack of a site- specific boring. This reliability-based approach can be applied both to design a new pile foundation and to requalify an existing pile foundation. It can also be used to make cost- benefit decisions about the need for and optimal amount of additional...

... (for cohesionless soils) are considered, along with the bias and coefficient of variation of the pile capacity subjected to axial and lateral loads. Bias is defined as the ratio between true and computed values. The uncertainties in the parameters considered in the geotechnical problems are thus identified...

...-term pile capacity. However, a growing number of reports of longer-term changes in capacity are emerging. Much uncertainty surrounds the factors responsible for these changes. This paper describes static and dynamic load tests on four open-ended piles, 0.324m in diameter, 11 and 22m long, driven...

... of offshore piles (e.g. Refs. 1-5). As a result of these efforts, the 17th edition of API RP2A (Ref. 6) design guidelines completely revised the recommended procedure for evaluation of axial pile capacity in clay. Furthermore, in the commentary to API RF2A (17th edition or later), the necessity of separately...

...OTC 7974 @ . . The Applicability of the Ras Tanajib Pile Capacity Method to Long Offshore Piles by Robert F. Stevens, Fugro-McClelland Marine Geosciences, Inc., and Khelll A. A1-Shafei, Saudi Ammco copyright 1S98, OFFSHORE TECHNOLOGY CONFERENCE This paper was prepared for presentation...

... overail calculated ~ vaiue of 2.5 to 3. The actuai reliability index of structures may be higher than this due to factors not included in the computations. Probability of Failure The probability of a pile failing is a function of pile capacity (resistance, R) and applied loading (L). If we consider...

... statistical anafyses. Predictions of pile capacity made using this new method are shown to be more accurate than those made using conventional current design criteria. Introduction Various reviews of axiaf pile load test data on i YE ties Veninto clays were performed in the mid eighties . The results...

... facts as we perceive them. We write herein with the perspective (and bias) of members of the API RP 2A Geotechnical Resource Group who were involved in formulating these revisions. Bias and Uncertainty in Pile Capacity Predictions. As detailed below, we believe that the current prediction methods have...