CALIBRATING RESISTANCE FACTORS UNDER LOAD AND RESISTANCE FACTOR DESIGN METHOD (LRFD) USING MONTE - CARLO SIMULATION

Bach Duong; Pieter van Gelder

Bach Duong Faculty of Hydraulic Engineering, National University of Civil Engineering (NUCE)
Pieter van Gelder Faculty of Technology, Policy and Management, Delft University of Technology (TU Delft), Netherlands.

Abstract

Calibrating resistance factors is to ensure safety degrees for foundation structures with high load effects from a superstructure system with target reliability levels. There have been some reliability methods used to calibrate resistance factors under the Load and Resistance Factor Design method (LRFD), such as First Order Second Moment (FOSM) and First Order Reliability Method (FORM). In this paper, a Monte-Carlo simulation - based resistance factor calibration is proposed. These three reliability methods are used to calibrate resistance factors for 16 cases of calculation, which are based on a bored pile database covering various types of soil, resistance prediction methods and construction methods. Correlation analyses between calibrated resistance factors according to three reliability methods are also considered herein. Through obtained results, some extra findings are illustrated in this paper.

Keywords: LRFD; resistance factor calibration; monte-Carlo simulation; target reliability index.

Received: September 12^th, 2016, revised: September 26^th, 2016, accepted: October 13^th, 2016

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