Reinforcing Steel Material

$matTag

integer tag identifying material

$matTag

unique material object integer tag

$fy

Yield stress in tension (see Figure 1)

$fu

Ultimate stress in tension

$Es

Initial elastic tangent

$Esh

Tangent at initial strain hardening

$esh

Strain corresponding to initial strain hardening

$eult

Strain at peak stress

-GABuck

Buckling Model Based on Gomes and Appleton (1997)

$lsr

Slenderness Ratio (see Figure 2)

$beta

Amplification factor for the buckled stress strain curve. (see Figure 3)

$r

Buckling reduction factor r can be a real number between [0.0 and 1.0] r=1.0 full reduction (no buckling) r=0.0 no reduction 0.0<r<1.0 linear interpolation between buckled and unbuckled curves

$gamma

Buckling constant (see Figures 3 and 4)