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- The plastic stress distribution method and the strain compatibility method are the two representative methods to calculate the P-M interaction strength of RCFT (rectangular conc rete filled tube) columns. The plastic stress distribution meth od is approximate while the stress compatibility method should approach the exact solution if accurate constitutive relations of t he materials involved are used. Recent study by the authors pointed out that, because of lack of accurate constitutive model for t he concrete confined by the rectangular steel tube, no strain compatibility method according to the current structural provisions provides a satisfactory prediction of the P-M interaction strength of RCFT columns under various material combinations. An empirical constitutive model which can capture the stress-strain characteristics of the confined concrete of RCFT columns is proposed based on analyzing extensive exisitng test database. The key idea was to define the concrete crushing strain as a function of steel-to-concrete strength ratio and width-to-thickne ss ratio of steel tube. It was shown that the proposed model l eads to more accurate and more consistent prediction of the P-M interaction strength of RCFT columns under general design conditions.

Constitutive Relation of Concrete to Predict P-M Interaction Strength of Rectangular CFT Short Columns