PROBABILISTIC FAILURE ANALYSIS OF DYNAMIC PILE CAPACITY USING HILEY AND JANBU FORMULAE

David A. Opeyemi.

Department of Civil Engineering Technology

 Rufus Giwa Polytechnic, Owo, Ondo State

E-mail: da_opeyemi@yahoo.com or davidopeyemi@gmail.com

ABSTRACT

The reliability assessment of the load carrying capacities of piles based on dynamic approach using Hiley and Janbu formulae is reported in this paper. Uncertainties are common phenomena in engineering, therefore all the interrelated variables in the load carrying capacities are treated as random variables with assumed practical probability density functions. The concept of the First-Order Reliability Method (FORM) is a powerful tool for estimating nominal probability level of failure associated with uncertainties and it is the method invoked for the reliability estimations. From the results, there is a correlation between the implied safety levels in Hiley and Janbu formulae. The safety level is clearly different with weight of pile and length of pile. Janbu formula leads to higher safety level than Hiley’s for increasing pile length.Key words: Probabilistic failure analysis, dynamic pile capacity, dynamic pile formulae