Reinforcing Steel Material: Difference between revisions

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| '''-GABuck''' || Buckling Model Based on Gomes and Appleton (1997)
| '''-GABuck''' || Buckling Model Based on Gomes and Appleton (1997)
|}
|}
<blockquote>
<blockquote>{|
{|
|  style="width:150px;"  |  '''$lsr''' || Slenderness Ratio (see Figure 2)
|  style="width:150px;"  |  '''$lsr''' || Slenderness Ratio (see Figure 2)
  |-
  |-
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|  style="width:150px;"  |  '''-DMBuck''' ||  Buckling model based on Dhakal and Maekawa (2002)
|  style="width:150px;"  |  '''-DMBuck''' ||  Buckling model based on Dhakal and Maekawa (2002)
|}
|}
<blockquote>
<blockquote>{|
 
{|
|  style="width:150px;"  |  '''$lsr''' ||  Slenderness Ratio (see Figure 2)
|  style="width:150px;"  |  '''$lsr''' ||  Slenderness Ratio (see Figure 2)
  |-valign=top
  |-valign=top
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:Default: alpha=1.0, this parameter is optional.
:Default: alpha=1.0, this parameter is optional.
|}
</blockquote>
{|
|  style="width:150px;"  |  '''-CMFatigue''' ||  Coffin-Manson Fatigue and Strength Reduction
|}
<blockquote>{|
|  style="width:150px;"  |  '''$Cf''' ||  Coffin-Manson constant C (see Figure 5)
|-
| '''$alpha''' ||  Coffin-Manson constant a (see Figure 5)
|-
| '''$Cd''' || Cyclic strength reduction constant (see Figure 6 and Equation 3)
|}
</blockquote>
   
   
{|
|  style="width:150px;"  |  '''-IsoHard''' || Isotropic Hardening / Diminishing Yield Plateau
|}
<blockquote>{|
|  style="width:150px;"  |  '''$a1''' ||  Hardening constant (default = 4.3)
|-
| '''$limit''' || Limit for the reduction of the yield plateau. % of original plateau length to remain (0.01 < limit < 1.0 )
:Limit =1.0, then no reduction takes place (default =0.01)
|}
</blockquote>


-MPCurveParams
Menegotto and Pinto Curve Parameters  see Fig 6b
$R1
(default = 0.333)
$R2
(default = 18)
$R3
(default = 4)
{|
|  style="width:150px;"  |  '''-MPCurveParams''' || Menegotto and Pinto Curve Parameters  see Fig 6b
|}
<blockquote>{|
|  style="width:150px;"  |  '''$R1''' ||  (default = 0.333)
|-
| '''$R2''' ||  (default = 18)
|-
| '''$R3''' ||  (default = 4)
|}
|}
</blockquote>
</blockquote>

Revision as of 06:19, 7 December 2009

Contact Authors: Jon Mohle M.S., P.E.
Sashi Kunnath: http://cee.engr.ucdavis.edu/faculty/kunnath/kunnath.htm


This command is used to construct a ReinforcingSteel uniaxial material object. This object is intended to be used in a reinforced concrete fiber section as the steel reinforcing material.

uniaxialMaterial ReinforcingSteel $matTag $fy $fu $Es $Esh $esh $eult < -GABuck $lsr $beta $r $gama > < -DMBuck $lsr < $alpha >> < -CMFatigue $Cf $alpha $Cd > < -IsoHard <$a1 <$limit> > >

$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)

{|

| style="width:150px;" | $lsr || Slenderness Ratio (see Figure 2) |- | $beta || Amplification factor for the buckled stress strain curve. (see Figure 3) |-valign=top | $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) |}

-DMBuck Buckling model based on Dhakal and Maekawa (2002)

{|

| style="width:150px;" | $lsr || Slenderness Ratio (see Figure 2) |-valign=top

| $alpha || Adjustment Constant usually between 0.75 and 1.0

Default: alpha=1.0, this parameter is optional.

|}


-CMFatigue Coffin-Manson Fatigue and Strength Reduction

{|

| style="width:150px;" | $Cf || Coffin-Manson constant C (see Figure 5) |- | $alpha || Coffin-Manson constant a (see Figure 5) |- | $Cd || Cyclic strength reduction constant (see Figure 6 and Equation 3) |}



-IsoHard Isotropic Hardening / Diminishing Yield Plateau

{|

| style="width:150px;" | $a1 || Hardening constant (default = 4.3) |- | $limit || Limit for the reduction of the yield plateau. % of original plateau length to remain (0.01 < limit < 1.0 )

Limit =1.0, then no reduction takes place (default =0.01)

|}


-MPCurveParams

Menegotto and Pinto Curve Parameters  see Fig 6b

$R1

(default = 0.333)

$R2

(default = 18)

$R3

(default = 4)

-MPCurveParams Menegotto and Pinto Curve Parameters see Fig 6b

{|

| style="width:150px;" | $R1 || (default = 0.333) |- | $R2 || (default = 18) |- | $R3 || (default = 4) |}