Adhesion factors for pile foundations in residual soils of Southern Africa

IngenieursweseSiviele IngenieurswesePlease help us populate SUNScholar with the post print version of this article. It can be e-mailed to: [email protected]

Comparison of Methods for Reliability Calibration of Partial Resistance Factors for Pile Foundations

Uncertainties are a hall mark of engineering design leading to the development of risk and reliability informed basis for decision making. Accordingly three different but related levels of approach, namely a risk based, a reliability based and a semi-probabilistic approach have been proposed in ISO 2394. However, for code development the semi-probabilistic approach has been internationally embraced. The approach constitutes verification method in which allowance is made for the uncertainties and variability assigned to the basic variables by means of partial factors. A number of methods for reliability calibration of partial resistance factors have been reported in the literature. These include: Advanced First-Order Second Moment Approach (A-FOSM), Mean Value First-Order Second Moment Approach (MV-FOSM), Approximate First-Order Second Moment Approach and the Design Value method. These four methods are used to derive partial resistance factors. Published resistance statistics based on a comprehensive pile load tests from the geologic region of Southern Africa are used as input in the reliability calibration process. Comparison of results shows that resistance partial factors from a full scale reliability method are comparable to those obtained from approximate methods

Reliability basis for adopting Eurocodes as South African standards

The merit of accepting Eurocode as reference for the next generation of South African standards for structural design is generally accepted locally. Due to wide differences in construction, environmental and institutional conditions, such implementation of Eurocode requirements and procedures into South African standards is not a straightforward process. The only rational manner in which standards from elsewhere could be adopted, adapted and calibrated for a specific set of conditions is to base the process on the principles of structural reliability. The paper describes the way in which calibration procedures are used to assess action combinations schemes and associated partial factors, and for structural resistance procedures with special reference to geotechnical design, concrete and water retaining structures. © 2011 Taylor & Francis Group, London

Mitigation of geotechnical uncertainties through a reliability-based design frame work

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Analysis of uncertainties in analytical pile design methods in South Africa.

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Characterization of model uncertainty in the static pile design formula

10.1061/(ASCE)GT.1943-5606.0000401Journal of Geotechnical and Geoenvironmental Engineering137170-8