Reliability analysis of reinforced concrete columns with random eccentricity designed by Chinese code

Abstract

The reliability analysis of reinforced concrete (RC) columns has many different characteristics, including the relationship between bending moment and axial force eccentricity, and the random eccentricity. However, it is not fully considered in the current reliability analysis, or it is difficult to systematically and accurately reveal the reliability control level of the RC columns design by using overly simplified and approximate analysis methods (fixed eccentricity), or only considering certain specific situations (Consider the bending moment and axial force generated by different loads as a class). Due to the functions of reinforced concrete eccentrically compressed members have different forms under different conditions, and the determination results of member failure forms in design cannot represent the actual failure situation. Based on the above situation, this paper establishes a dimensionless reinforced concrete column analysis model and carries out reliability analysis through Monte Carlo simulation. The analysis results show that the model can obtain accurate reliability results, effectively predict the reliability changes under different design conditions, and also conveniently predict the ratio of failure probability to total failure probability under a given failure. For columns designed as large eccentric failure, the failure probability of large eccentric failure is dominant in the total failure probability, and the same is true for small eccentric failure. However, for columns with balanced failure, the failure probability of large eccentricity is dominant, while the failure probability range of small eccentricity is only a small part.