New design approach for RC slender columns

Abstract

The recommended design methods for RC slender columns in the most current Codes and recent researches are mainly based on the moment magnifier approach. In these methods, the linear static moment acting on column section is increased by an empirical factor. This factor takes into account the slenderness ratio and end conditions of the column. Both geometric and physical nonlinear behaviors are not considered in most of the current Codes. Ignoring of the nonlinear behavior leads to inaccurate design output. In the present paper a critical review will be carried out for most of the recommended design methods in Codes and recent researches. Results of these methods will also be compared with experimental results. On the bases of this study a new simple and direct design approach will be recommended for the design of RC slender columns considering both geometric and material nonlinearity.