A Method for Estimation of Probable Flexural Strength of R/C Columns

Abstract

A Method for Estimation of Probable Flexural Strength of R/C Columns In this study, the effects of uncertainties on column flexural moment capacity are investigated taking into consideration the statistical distributions of effective parameters on column flexural moment capacity M. For this purpose, the variability on material strengths, section properties and analytical moment curvature responses (M-max) which use different confined and unconfined concrete models are modeled with Monte Carlo simulation. Flexural overstrength ratios based on ultimate moment capacity M-r (lambda(r)=M-max/M-r) are obtained for sample column sections with different reinforcement configuration, section dimension, concrete strength, reinforcement strength and mechanical index of lateral reinforcement with a computer program and statistical evaluation is performed for analysis results. Also, the effects of basic design variables on column moment capacity are investigated and a simple expression is derived for the estimation of the probable flexural strength ratio with the 10% probability of being exceeded (lambda(r,%10)) using characteristic material strengths. Finally, the proposed method is compared to ACT 318, Eurocode 8 and Turkish seismic design code provisions.