Long-Term Random Deflection of Eccentrically Loaded RC Column

Owing to the randomness of shrinkage and creep of concrete, random analysis method should be adopted to provide probabilistic guarantee for the analysis of concrete long-term random deflection. Stochastic variables for the long-term analysis with GL2000 model about creep and shrinkage of concrete were presented. Combining Monte Carlo sampling with the response surface method, the stochastic analysis model was established, which is on time-variant deflection of concrete structure. The long-term deflection of reinforce concrete (RC) columns were analyzed using this model. The influences of tensile strength of concrete on long-term deflection of RC columns were considered. The case study shows that when eccentricity ratio is increased to 1.0, the sensitivity of tensile strength reaches a peak of near 0.6 and then decreases gradually. Afterwards, when eccentricity ratio is 1.6, the sensitivity value is reduced to zero. The tensile strength of concrete has no effect on long-term deflection of columns prior to the crack of concrete. With the increase of eccentricity ratio, the effects of tensile strength of concrete will grow to peak and drop down gradually.