Design interaction formula for eccentric concrete columns

Abstract EN

This paper presents an interaction formula for eccentrically loaded slender concrete columns.

This formula considers the relationships between the slenderness and the ultimate load of the reinforcement concrete columns for variable length.

The method of nonlinear analysis used to establish the ultimate load of slender concrete columns was proposed by Badr [1].

Both material and geometric nonlinearities are taken into consideration.

The method applied herein investigates the column behavior with low, medium and high strength concrete, and taking into consideration changing the end conditions and different values of eccentricities.

The results are compared with previous experimental and theoretical work, Poon [2,3].

The failure loads predicted by the proposed method are close to these predicted by the P-Delta method (Poon method) and show a good agreement with the experimental values.

A proposed interaction formula is suggested to help the designer predicting the ultimate load of slender concrete columns of low, medium and high strength concrete.

This equation is valid for a compression failure of concrete columns where e / t less than 0.4.