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n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Resistance model uncertainty factors for ultimate limit state design of pile foundations : technical paper

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Abstract

The current limit state design procedure for pile foundations presented in geotechnical codes (e.g. SANS 10160-5, EN 1997-1) stipulates that, when the pile capacity is determined using an analytical approach, such as the static analysis using engineering properties of the soil as determined from laboratory or in-situ field testing, the prescribed partial resistance factors (γ) need to be corrected by a partial factor for the uncertainty in the resistance model (γ) or the resistance model uncertainty factor. The international position is to derive model uncertainty factors for both actions and resistances from available experimental data. Accordingly this paper makes use of a local pile load test database to derive the appropriate γ values for ultimate limit state design of pile foundations. The analysis indicates that γ values of 1.3 and 1.5 for piles in cohesive and non-cohesive materials respectively are appropriate. Alternatively, a single value of γ = 1.4 for all piles in all soils can be adopted with different γ values for the two distinctive pile classes of piles in cohesive and non-cohesive soils.

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/content/civileng/56/2/EJC158378
2014-08-01
2016-12-04
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