Authors: Anil Misra Lance A Roberts Steven M Levorson
Publish Date: 2006/10/05
Volume: 25, Issue: 1, Pages: 65-77
Abstract
Load displacement analysis of drilled shafts can be accomplished by utilizing the “tz” method which models soil resistance along the length and tip of the drilled shaft as a series of springs For nonlinear soil springs the governing differential equation that describes the soilstructure interaction may be discretized into a set of algebraic equations based upon finite difference methods This system of algebraic equations may be solved to determine the load–displacement behavior of the drilled shaft when subjected to compression or pullout By combining the finite difference method with Monte Carlo simulation techniques a probabilistic load–displacement analysis can be conducted The probabilistic analysis is advantageous compared to standard factor of safety design because uncertainties with the shaft–soil interface and tip properties can be independently quantified This paper presents a reliability analysis of drilled shaft behavior by combining the finite difference technique for analyzing nonlinear load–displacement behavior with Monte Carlo simulation method As a result we develop probabilistic relationships for drilled shaft design for both total stress undrained and effective stress drained parameters The results are presented in the form of factor of safety or resistance factors suitable for serviceability design of drilled shafts
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