On the normal section design of doubly reinforced flexural members,tension members with large eccentricity and compression members with large eccentricity,the balanced section is designed in general,of which the equifinal depth of compression zone equals to the balanced depth of compression zone.

On the normal section design of doubly reinforced flexural members,tension members with large eccentricity and compression members with large eccentricity,the balanced section is designed in general,of which the equifinal depth of compression zone equals to the balanced depth of compression zone.

This paper presents calculation methods for reinforced concrete eccentric compression member with ring section, its contents are determination of longitudinal steel for new design member and calculation of carrying capacity for already reinforced members.

In this paper, the defining methods of the bearing capacity (R) of a reinfoed concrete eccentrically compressed member are analysed and compared diagrammatically.

The paper presents an approximate method of calculating ξ by using a first order multinomial of best approximation to simplify the basic formula in section design of symmetric reinforcement for compression member with small eccentricity,which results indicate that the method was higher accuracy and relative lower error than that of code s formula.