Reliability based assessment of reinforced concrete columns under eccenric loads using refined first-order reliability method

Shahraki, Hossein; Reyhani, Ahmad

doi:10.61186/NMCE.2303.780

Reliability based assessment of reinforced concrete columns under eccenric loads using refined first-order reliability method

Document Type : Research

Authors

Hossein Shahraki ¹

Ahmad Reyhani ²

¹ Assistant Professor, Department of Civil Engineering, University of Bojnord, Bojnord, Iran

² M.Sc. of Structural engineering, Department of civil Engineering, University of Bojnord, Bojnord, Iran

10.61186/NMCE.2303.780

Abstract

This paper presents an efficient approach for the failure probability assessment of reinforced concrete (RC) columns under the combination of the gravity and seismic loads considering uncertainty in the load eccentricity. In the proposed approach, Limit State Function (LSF) are conditionally formulated for the load eccentricity in column and the conditional reliability index is assessed using Refined First-Order Reliability Method (R-FORM) based on cross-entropy optimization method. The conditional reliability index along with the probability density function of the load eccentricity have been used to estimate the failure probability of the column. The important feature of the proposed approach is precise find of the most probable failure point, which provide a precise estimation of the failure probability of the RC columns under different load eccentricities. The results indicate that the failure probability of the RC columns is sensitive to uncertainty in the load eccentricity as well as of structural system, particularly when the load eccentricity is in the tension failure region. The effect of longitudinal reinforcement varies depending on the probability density function of the load eccentricity and the region of the interaction diagram where the column is loaded.

Keywords

Reliability

RC column

Load eccentricity

Refined FORM

Cross-entropy optimization

Subjects

Structural Engineering

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