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PressureDependMultiYield02 material is modified from PressureDependMultiYield material, with: 1) additional parameters ($contrac3 and $dilat3) to account for K? effect, 2) a parameter to account for the influence of previous dilation history on subsequent contraction phase ($contrac2), and 3) modified logic related to permanent shear strain accumulation ($liquefac1 and $liquefac2). Please visit http://cyclic.ucsd.edu/opensees for examples.
nDMaterial PressureDependMultiYield02 $tag $nd $rho $refShearModul $refBulkModul $frictionAng $peakShearStra $refPress $pressDependCoe $PTAng $contrac1 $contrac3 $dilat1 $dilat3 <$noYieldSurf=20 <$r1 $Gs1 …> $contrac2=5. $dilat2=3. $liquefac1=1. $liquefac2=0. $e=0.6 $cs1=0.9 $cs2=0.02 $cs3=0.7 $pa=101 <$c=0.1>>
$contrac3 |
A non-negative constant reflecting K? effect. |
$dilat3 |
A non-negative constant reflecting K? effect. |
$contrac2 |
A non-negative constant reflecting dilation history on contraction tendency. |
$liquefac1 |
Damage parameter to define accumulated permanent shear strain as a function of dilation history. (Redefined and different from PressureDependMultiYield material). |
$liquefac2 |
Damage parameter to define biased accumulation of permanent shear strain as a function of load reversal history. (Redefined and different from PressureDependMultiYield material). |
$c |
Numerical constant (default value = 0.1 kPa) |
Others |
See PressureDependMultiYield material above. |
NOTE:
The following values are suggested for the model parameters.
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Dr=30% |
Dr=40% |
Dr=50% |
Dr=60% |
Dr=75% |
rho |
1.7 ton/m3 or 1.59x10-4 (lbf)(s2)/in4 |
1.8 ton/m3 or 1.685x10-4 (lbf)(s2)/in4 |
1.9 ton/m3 or 1.778x10-4 (lbf)(s2)/in4 |
2.0 ton/m3 or 1.872x10-4 (lbf)(s2)/in4 |
2.1 ton/m3 or 1.965x10-4 (lbf)(s2)/in4 |
refShearModul (at p'r=80 kPa or 11.6 psi) |
6x104 kPa or 8.702x103 psi |
9x104 kPa or 1.305x104 psi |
10x104 kPa or 1.45x104 psi |
11x104 kPa or 1.595x104 psi |
13x104 kPa or 1.885x104 psi |
refBulkModu (at p'r=80 kPa or 11.6 psi) |
16x104 kPa or 2.321x104 psi (K0=0.5) |
22x104 kPa or 3.191x104 psi (K0=0.47) |
23.3x104 kPa or 3.379x104 psi (K0=0.45) |
24x104 kPa or 3.481x104 psi (K0=0.43) |
26x104 kPa or 3.771x104 psi (K0=0.4) |
frictionAng |
31 |
32 |
33.5 |
35 |
36.5 |
PTAng |
31 |
26 |
25.5 |
26 |
26 |
peakShearStra (at p'r=101 kPa or 14.65 psi) |
0.1 |
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refPress (p'r,) |
101 kPa or 14.65 psi |
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pressDependCoe |
0.5 |
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Contrac1 |
0.087 |
0.067 |
0.045 |
0.028 |
0.013 |
Contrac3 |
0.18 |
0.23 |
0.15 |
0.05 |
0.0 |
dilat1 |
0. |
0.06 |
0.06 |
0.1 |
0.3 |
dilat3 |
0.0 |
0.27 |
0.15 |
0.05 |
0.0 |
e |
0.85 |
0.77 |
0.7 |
0.65 |
0.55 |
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