**Moderators:** silvia, Moderators

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Dear OpenSees Community Members

I am using "nDMaterial FAReinforcedConcretePlaneStress" for modelling a framed shear wall, I used nonlinear beam column elements to model the beams and columns and used "nDMaterial FAReinforcedConcretePlaneStress" for modelling wall elements. Joined the common nodes of beam, columns and plane stress elements using EqualDOF command. I subjected the sehar wall to cyclic loading.

My problem is: Upto certain displacement cycles, analysis is working good but after that the norm value is becoming higher and higher, no convergence at all in the load-displacement plots. values of load-displacement looks like garbage values.

I as have attached the "nDMaterial FAReinforcedConcretePlaneStress" definition as below.

# set fc fy E

set wfc 32.2;

set wfyv 418;

set wfyh1 420.0;

set wE 200000.0;

set rouv 0.016;

set rouh1 0.002;

set rou1 0.0

set rou2 0.0

set eps_c 0.003

# UniaxialMaterial: steelZ01

# tag fy E0 fpc rou

uniaxialMaterial SteelZ01 11 $wfyv $wE $wfc $rouv

uniaxialMaterial SteelZ01 12 $wfyh1 $wE $wfc $rouh1

# UniaxialMaterial: concreteZ01

# ConcreteZ01 tag f'c ec0

uniaxialMaterial ConcreteZ01 14 [expr -$wfc] [expr -$eps_c]

uniaxialMaterial ConcreteZ01 15 [expr -$wfc] [expr -$eps_c]

set pi 3.14

nDMaterial FAReinforcedConcretePlaneStress 21 0.0 11 12 14 15 [expr 0.0*$pi] [expr 0.5*$pi] $rouv $rouh1 $wfc $wfyv $wE 0.003

Output values as shown below:

-1225.24 -5.29974

-1234.79 -5.39974

-1244.36 -5.49974

-1254.12 -5.59974

-1263.61 -5.69973

-1273.12 -5.79973

-1282.58 -5.89973

-1291.93 -5.99973

-1301.17 -6.09973 ## Upto here values are fine, after that garbage values came into picture, could any one please tell me where might be the wrong

-2543.54 -6.17473

442.817 -6.2978

33.3545 -6.40911

-782.957 -6.50552

4723.83 -6.68576

2381.25 -6.70998

2526.14 -6.79284

-2032.36 -7.123

I am using "nDMaterial FAReinforcedConcretePlaneStress" for modelling a framed shear wall, I used nonlinear beam column elements to model the beams and columns and used "nDMaterial FAReinforcedConcretePlaneStress" for modelling wall elements. Joined the common nodes of beam, columns and plane stress elements using EqualDOF command. I subjected the sehar wall to cyclic loading.

My problem is: Upto certain displacement cycles, analysis is working good but after that the norm value is becoming higher and higher, no convergence at all in the load-displacement plots. values of load-displacement looks like garbage values.

I as have attached the "nDMaterial FAReinforcedConcretePlaneStress" definition as below.

# set fc fy E

set wfc 32.2;

set wfyv 418;

set wfyh1 420.0;

set wE 200000.0;

set rouv 0.016;

set rouh1 0.002;

set rou1 0.0

set rou2 0.0

set eps_c 0.003

# UniaxialMaterial: steelZ01

# tag fy E0 fpc rou

uniaxialMaterial SteelZ01 11 $wfyv $wE $wfc $rouv

uniaxialMaterial SteelZ01 12 $wfyh1 $wE $wfc $rouh1

# UniaxialMaterial: concreteZ01

# ConcreteZ01 tag f'c ec0

uniaxialMaterial ConcreteZ01 14 [expr -$wfc] [expr -$eps_c]

uniaxialMaterial ConcreteZ01 15 [expr -$wfc] [expr -$eps_c]

set pi 3.14

nDMaterial FAReinforcedConcretePlaneStress 21 0.0 11 12 14 15 [expr 0.0*$pi] [expr 0.5*$pi] $rouv $rouh1 $wfc $wfyv $wE 0.003

Output values as shown below:

-1225.24 -5.29974

-1234.79 -5.39974

-1244.36 -5.49974

-1254.12 -5.59974

-1263.61 -5.69973

-1273.12 -5.79973

-1282.58 -5.89973

-1291.93 -5.99973

-1301.17 -6.09973 ## Upto here values are fine, after that garbage values came into picture, could any one please tell me where might be the wrong

-2543.54 -6.17473

442.817 -6.2978

33.3545 -6.40911

-782.957 -6.50552

4723.83 -6.68576

2381.25 -6.70998

2526.14 -6.79284

-2032.36 -7.123

- polimeruvijay
**Posts:**25**Joined:**Fri Jan 29, 2016 10:20 pm

It looks like you should set the convergence tolerances to smaller values to force the analysis to converge and use adaptive solution strategies

- selimgunay
**Posts:**463**Joined:**Mon Sep 09, 2013 8:50 pm**Location:**University of California, Berkeley

Dear Selim Gunay

Right now I am using a tolerance of 0.01 (NormDispIncr) and KrylovNewton Algorithm for analysis. Could you please suggest any other algorithms which can help solving the error.

Thank you

Vijay

Right now I am using a tolerance of 0.01 (NormDispIncr) and KrylovNewton Algorithm for analysis. Could you please suggest any other algorithms which can help solving the error.

Thank you

Vijay

- polimeruvijay
**Posts:**25**Joined:**Fri Jan 29, 2016 10:20 pm

these materials cause problems .. i have some newer materials for modeling walls .. you might even try forgetting the beam elements with these .. here is some code copied from an example put together by Dr. Petrone

# Concrete

# Parameters for the new concrete model

set E [expr 36900e6*$Pa] ;#elastic modulus

set nu 0.2 ;#Poisson ratio

set fc [expr 56.0e6*$Pa] ;#compressive yield strength

set ft [expr 5.0e6*$Pa] ;#tensile yield strength

set Ap 0.1 ;#damage material data

set An 1.5 ;#damage material data

set Bn 0.75 ;#damage material data

set Beta 0.4

nDMaterial PlasticDamageConcretePlaneStress 10 $E $nu $ft $fc $Beta $Ap $An $Bn; #Boundaries

nDMaterial PlasticDamageConcretePlaneStress 11 $E $nu $ft $fc $Beta $Ap $An $Bn; #Web

#NONLINEAR BIDIRECTIONAL Steel

# STEEL

set Steel 2

set Fy [expr 457.5e+6*$Pa]

set E [expr 200000e+6*$Pa]

set b 0.011042

set R0 20.0

set CR1 0.925

set CR2 0.15

set a1 0.0

set a2 55.0

set a3 0.0

set a4 55.0

#uniaxialMaterial Steel02 $Steel $Fy $E $b $R0 $CR1 $CR2 $a1 $a2 $a3 $a4

#uniaxialMaterial Steel4 $Steel $Fy $E -kin $b 20 0.9 0.15

#uniaxialMaterial Steel02 $Steel $Fy $E $b $R0 $CR1 $CR2 $a1 $a2 $a3 $a4

uniaxialMaterial Steel01 $Steel $Fy $E $b $a1 $a2 $a3 $a4

nDMaterial PlaneStressRebarMaterial 12 $Steel 0; #vertical

nDMaterial PlaneStressRebarMaterial 13 $Steel 90; #horizontal

# define SECTION

set t [expr 6.*2.54*0.01]; #in m

nDMaterial PlaneStressLayeredMaterial 1 3 10 $t 12 [expr $t*.0278] 13 [expr $t*.0278];# Boundaries

nDMaterial PlaneStressLayeredMaterial 2 3 11 $t 12 [expr $t*.00367*1.0] 13 [expr $t*.00367*1.0];#Web FACTOR 1.3

for {set j 0} {$j < $numX} {incr j 1} {

if {$j < $numEdge || $j >= [expr $numX-$numEdge]} {

element quad $eleTag $iNode $jNode $kNode $lNode 1.0 PlaneStress 1

} else {

element quad $eleTag $iNode $jNode $kNode $lNode 1.0 PlaneStress 2

}

# Concrete

# Parameters for the new concrete model

set E [expr 36900e6*$Pa] ;#elastic modulus

set nu 0.2 ;#Poisson ratio

set fc [expr 56.0e6*$Pa] ;#compressive yield strength

set ft [expr 5.0e6*$Pa] ;#tensile yield strength

set Ap 0.1 ;#damage material data

set An 1.5 ;#damage material data

set Bn 0.75 ;#damage material data

set Beta 0.4

nDMaterial PlasticDamageConcretePlaneStress 10 $E $nu $ft $fc $Beta $Ap $An $Bn; #Boundaries

nDMaterial PlasticDamageConcretePlaneStress 11 $E $nu $ft $fc $Beta $Ap $An $Bn; #Web

#NONLINEAR BIDIRECTIONAL Steel

# STEEL

set Steel 2

set Fy [expr 457.5e+6*$Pa]

set E [expr 200000e+6*$Pa]

set b 0.011042

set R0 20.0

set CR1 0.925

set CR2 0.15

set a1 0.0

set a2 55.0

set a3 0.0

set a4 55.0

#uniaxialMaterial Steel02 $Steel $Fy $E $b $R0 $CR1 $CR2 $a1 $a2 $a3 $a4

#uniaxialMaterial Steel4 $Steel $Fy $E -kin $b 20 0.9 0.15

#uniaxialMaterial Steel02 $Steel $Fy $E $b $R0 $CR1 $CR2 $a1 $a2 $a3 $a4

uniaxialMaterial Steel01 $Steel $Fy $E $b $a1 $a2 $a3 $a4

nDMaterial PlaneStressRebarMaterial 12 $Steel 0; #vertical

nDMaterial PlaneStressRebarMaterial 13 $Steel 90; #horizontal

# define SECTION

set t [expr 6.*2.54*0.01]; #in m

nDMaterial PlaneStressLayeredMaterial 1 3 10 $t 12 [expr $t*.0278] 13 [expr $t*.0278];# Boundaries

nDMaterial PlaneStressLayeredMaterial 2 3 11 $t 12 [expr $t*.00367*1.0] 13 [expr $t*.00367*1.0];#Web FACTOR 1.3

for {set j 0} {$j < $numX} {incr j 1} {

if {$j < $numEdge || $j >= [expr $numX-$numEdge]} {

element quad $eleTag $iNode $jNode $kNode $lNode 1.0 PlaneStress 1

} else {

element quad $eleTag $iNode $jNode $kNode $lNode 1.0 PlaneStress 2

}

- fmk
- Site Admin
**Posts:**5860**Joined:**Fri Jun 11, 2004 2:33 pm**Location:**UC Berkeley

Dear FMK

Thank you very much. It seems, "PlasticDamageConcretePlaneStress " and "PlaneStressLayeredMaterial " are available in the latest revisions. I downloaded the source codes. I will update the status on the new materials soon.

Could you please send the download details of Dr. Petrone's Input files and corresponding thesis/research papers for understanding the formulation details.

Thank you

Thank you very much. It seems, "PlasticDamageConcretePlaneStress " and "PlaneStressLayeredMaterial " are available in the latest revisions. I downloaded the source codes. I will update the status on the new materials soon.

Could you please send the download details of Dr. Petrone's Input files and corresponding thesis/research papers for understanding the formulation details.

Thank you

- polimeruvijay
**Posts:**25**Joined:**Fri Jan 29, 2016 10:20 pm

Hi Dr. McKenna,

I'm experimenting with this material as well for modelling walls... if there's any information about the "damage material data" parameters from the sample code you posted it would be very useful!

From code:

set Ap 0.1 ;#damage material data

set An 1.5 ;#damage material data

set Bn 0.75 ;#damage material data

set Beta 0.4

Thanks in advance,

Josh

I'm experimenting with this material as well for modelling walls... if there's any information about the "damage material data" parameters from the sample code you posted it would be very useful!

From code:

set Ap 0.1 ;#damage material data

set An 1.5 ;#damage material data

set Bn 0.75 ;#damage material data

set Beta 0.4

Thanks in advance,

Josh

- joshwoods
**Posts:**7**Joined:**Thu Jan 24, 2013 6:47 am**Location:**Carleton University

joshwoods wrote:

> Hi Dr. McKenna,

>

> I'm experimenting with this material as well for modelling walls... if

> there's any information about the "damage material data"

> parameters from the sample code you posted it would be very useful!

>

> From code:

> set Ap 0.1 ;#damage material data

> set An 1.5 ;#damage material data

> set Bn 0.75 ;#damage material data

> set Beta 0.4

>

> Thanks in advance,

>

> Josh

---------------------------------------------------------------------------------------------------------------------

Dear JoshWoods

How are you experimenting with the above mentioned models, as they are not in the OpenSEES 2.5.0 Version. Do you have any latest version of opensees.exe application? I downloaded the source code's latest revision but it is showing some python and tcl86 errors. if you have the latest versions of working opensees source codes or simply opensees.exe fie, could you send me to "vijaypolimeru@gmail.com"

Thanks in advance

> Hi Dr. McKenna,

>

> I'm experimenting with this material as well for modelling walls... if

> there's any information about the "damage material data"

> parameters from the sample code you posted it would be very useful!

>

> From code:

> set Ap 0.1 ;#damage material data

> set An 1.5 ;#damage material data

> set Bn 0.75 ;#damage material data

> set Beta 0.4

>

> Thanks in advance,

>

> Josh

---------------------------------------------------------------------------------------------------------------------

Dear JoshWoods

How are you experimenting with the above mentioned models, as they are not in the OpenSEES 2.5.0 Version. Do you have any latest version of opensees.exe application? I downloaded the source code's latest revision but it is showing some python and tcl86 errors. if you have the latest versions of working opensees source codes or simply opensees.exe fie, could you send me to "vijaypolimeru@gmail.com"

Thanks in advance

- polimeruvijay
**Posts:**25**Joined:**Fri Jan 29, 2016 10:20 pm

See this thread, there is a recent version of OpenSees 3.0, which I think should have this material model.

Let me know if it works: viewtopic.php?f=2&t=64140

Josh

Let me know if it works: viewtopic.php?f=2&t=64140

Josh

- joshwoods
**Posts:**7**Joined:**Thu Jan 24, 2013 6:47 am**Location:**Carleton University

Dear Joshwoods

Thank you very much, I Just downloaded the Opensees 3.0.0a version .exe file. I will soon let you know about the input file, status.

Could you please send any two dimensional model (such as shear walls, hollow columns etc...) example input file(ndm 2), if you have any.

Regards...

Vijay

Thank you very much, I Just downloaded the Opensees 3.0.0a version .exe file. I will soon let you know about the input file, status.

Could you please send any two dimensional model (such as shear walls, hollow columns etc...) example input file(ndm 2), if you have any.

Regards...

Vijay

- polimeruvijay
**Posts:**25**Joined:**Fri Jan 29, 2016 10:20 pm

Hi Vijay,

I am currently working on developing my first model using this element. I think it shouldn't be too hard to use.

Let me know if you run into any problems.

Josh

I am currently working on developing my first model using this element. I think it shouldn't be too hard to use.

Let me know if you run into any problems.

Josh

- joshwoods
**Posts:**7**Joined:**Thu Jan 24, 2013 6:47 am**Location:**Carleton University

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