Paper
presents the
reliability analysis of
eccentrically loaded reinforced concrete
columns. The analysis was
performed according to ACI 318 code provisions for
possible change of resistance factors. Change of the load model in the code,
and new statistical parameters for reinforcing steel and concrete are utilized in
estimation of resistance factors. New closedform sectional resistance formulas
were used in development of the new limit state function for
reliability analysis. The proposed approach allows for creation of reliability surface
covering all design cases, from axial compression to pure flexure. Several
concrete strengths, reinforcement ratios and cross-sections were investigated.
Plots of obtained resistance factor versus load eccentricity and load
combinations were prepared. Influence of basic parameters was discussed and
conclusions were drawn from the analysis. The results serve as a basis for
selection of new resistance factors for reinforced concrete columns.