Cosic M., Susic N., Folic R., Bancila R.: Probabilistic Analysis of Bearing Capacity of Piles with Variable Parameters in CPT Test and Calculation According to the Requirements of Eurocode 7 (EN 1997-1: 2004) Regulations, Structural Integrity and Life, Vol. 16, No. 1, 2016. pp. 25-34.

Abstract

The paper presents a probabilistic concept for determining the pile bearing capacity, taking into account the variability of CPT test parameters and methodology of calculation according to the requirements of Eurocode 7 (EN 1997-1:2004) regulations. Based on a single initial (real) CPT test, a higher number of generated (simulation) CPT tests were introduced drawing on the solutions of statistics and probability theory. The research found that the best solutions are achieved using the DA 2 design approach for n(CPT)≥10 tests. Taking into account the deterministic and probabilistic approach in the analysis pile bearing capacity, it was found that for the DA 2 design approach the ratio of pile bearing capacity obtained from the simulation and the capacity as determined through three methods (Mazurkiewicz, Van der Veen and hyperbolic approximation) is Rc,d/Pu=1.148. Using the reliability index, the following values of partial resistance factors were obtained: γb,β≈1.1, γs,β≈1.1, which also points to the DA 2 design approach.

Keywords

pile, bearing capacity, CPT test, probability theory, Eurocode 7 (EN 1997-1: 2004)