University of Technology Sydney Reinforced Concrete Project

A reinforced concrete- column cross-section is shown in,Figure l.. Any appted design
moment is to be appliedabout the majorprincipal axis shown. The asprnehically
arranged reinforcement is N-bars and for the concrete f c : 32vIPawith y :0.822
and.Ec: 28500 MPa. The nominal axial compression loads on the colurirn are
permanent action ofNG:2200k].[, imposed action ofNQ : 1500k].[, and M* :
650kNm.   

And

An inverted T RC column is.proposed.”Its cross-section and reinforcement is shown in the sketch
below. The concrete characteristic strength is to be f”‘ = 32.MPa. The column can be considered to
be braced with an unsupported length Lu = 10.0 m. The idealised end restraint conditions are shown
in the sketch below. The nominal axial compression loads (including self-weight) that the column is
to carry are:
Permanent action (G), Na = 2000 Ltt *O Imposed action (Q), Nq = 1000 kN.
The line of action of the applied axial loads is at an eccentricity of e = 1 00 mm. The direction of the
eccentricity is such that the induced moment will cause tension at the face with 4N32 reinforcement.
The eccentricity and expected BMD for the column are shown in the sketch below (this BMD
represents single curvature along the length of the column). For consideration of the induced
moment, I have calculated that the radius of gyration is r = 221 mm about the horizontal axis.