Figure

Flow chart for slender columns (nominal curvature method)

From Figure 2

Determine Kr from Figure 9 or from Kr = (nu - n) / (nu - nbat) s 1 where n = NEd / (Ac /cd), relative axial force NEd = the design value of axial force nu = 1 + w nbai = 0.4

As,est = the estimated total area of steel Ac = the area of concrete

Hef = the effective creep ratio B = 0.35 + /ck/200 - X/150 L = the slenderness ratio. See section on creep (page 6)

Calculate e2 from

E, = elastic modulus of reinforcing steel (200 GPa)

Revise value ofA.est e2 = 0.1 ( Kr ^ ) \ 0.45d E, 1 where

E, = elastic modulus of reinforcing steel (200 GPa)

M0e = 0.6 M02 + 0.4 M01 > 0.4 M02 M2 = Ntd e2 MEd = Max {M02, M0e + M2, M01 + 0.5 M2}

Use column chart to find As,req'd for NEd and MEd Alternatively, solve by iteration or by using RC Spreadsheet7

Figure 5

Effective lengths for isolated members

Figure 5

Effective lengths for isolated members

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