A Study on the Superposition Method to Estimate the Ultimate Strength of Steel Reinforced Concrete Column Subjected to Axial Thrust and Bending Moment Simultaneously

Abstract

In this paper, considered is the further applicability of the "Superposition Method" to estimate the load carrying capacity of steel reinforced concrete column subjected to axial thrust and bending moment. The accuracy of the superposition method is checked in the combination use of various grades of concrete and steel. It is confirmed that the unsafe-side error of superposition method is not large even though steel portion with shallow depth is put in a cross section of a column and/or an asymmetrical steel shape is used, provided that the yield strength of steel is not too high. The unsafeside error of the superposition method is reasonably compensated by the reduction of ultimate strength of concrete which was specified in the design standard of AIJ for SRC structures.