1) A FIBER BEAM-COLUMN ELEMENT FOR SEISMIC RESPONSE ANALYSIS OF REINFORCED CONCRETE STRUCTURES
by Fabio F. Taucer, Research Assistant, Enrico Spacone, Doctoral Student and Filip C. Filippou - Associate Professor
Report No. UCB/EERC-91/17
Earthquake Engineering Research Center
College of Engineering
University of California, Berkeley
December 1991
2) FIBRE BEAM-COLUMN MODEL FOR NON-LINEAR ANALYSIS OF R/C FRAMES: PART I. FORMULATION (ENRICO SPACONE, FILIP C. FILIPPOU AND FABIO F.TAUCER)
EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS, VOL. 25, 71 1-725 (1996)
3) FIBRE BEAM-COLUMN MODEL FOR NON-LINEAR ANALYSIS OF R/C FRAMES: PART 11. APPLICATIONS (ENRICO SPACONE, FILIP C. FILIPPOU AND FABIO F.TAUCER)
EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS, VOL. 25,727-742 (1996)
4) EVALUATION OF NONLINEAR FRAME FINITE-ELEMENT MODELS (Ansgar Neuenhofer and Filip C. Filippou)
Journal of Structural Engineering. Vol. 123, No.7, July, 1997. ©ASCE
5) GEOMETRICALLY NONLINEAR FLEXIBILITY-BASED FRAME FINITE ELEMENT (Ansgar Neuenhofer and Filip C. Filippou)
Journal of Structural Engineering, VoL 124. No.6. June. 1998. ©ASCE.
Search found 50 matches
- Tue Jun 08, 2021 11:15 pm
- Forum: OpenSeesPy
- Topic: Request scientific articles/reference of theoretical analysis for fiber section
- Replies: 1
- Views: 3433
- Tue Jun 08, 2021 9:39 pm
- Forum: OpenSeesPy
- Topic: Parametes from J2 plasticity model
- Replies: 2
- Views: 4251
Re: Parametes from J2 plasticity model
Thanks a lot !
I tried it - but it shows the message:
"More than 25 iterations in constituive subroutine J2-plasticity "
I tried it - but it shows the message:
"More than 25 iterations in constituive subroutine J2-plasticity "
- Mon Jun 07, 2021 11:03 pm
- Forum: OpenSeesPy
- Topic: Parametes from J2 plasticity model
- Replies: 2
- Views: 4251
Parametes from J2 plasticity model
Hi,
Can somebody tell me about the parameters in J2 plasticity.
nDMaterial('J2Plasticity', matTag, K, G, sig0, sigInf, delta, H)
What are delta and H ?
How to calibrate them from experimental stress-strain curve ?
Can somebody tell me about the parameters in J2 plasticity.
nDMaterial('J2Plasticity', matTag, K, G, sig0, sigInf, delta, H)
What are delta and H ?
How to calibrate them from experimental stress-strain curve ?
- Mon Jun 07, 2021 10:25 pm
- Forum: OpenSees.exe Users
- Topic: analyze failed
- Replies: 2
- Views: 3029
Re: analyze failed
Lapack errors are because - there is some discontinuity in your model or no proper support i.e. your model is moving as a rigid body
- Sat Apr 24, 2021 3:43 am
- Forum: OpenSeesPy
- Topic: Moment releases for 3-d elasticBeamColumn
- Replies: 0
- Views: 6785
Moment releases for 3-d elasticBeamColumn
Hi,
In the GitHub source of elasticBeamColumn3d, I see implementation of moment releases. Are they exposed to interpreters ?
OpenSeesPy documentation talks only about 2d case.
If anybody has used them in their local compilation, can you please tell me if they are working properly?
What does 0,1,2,3 commands correspond to?
In the GitHub source of elasticBeamColumn3d, I see implementation of moment releases. Are they exposed to interpreters ?
OpenSeesPy documentation talks only about 2d case.
If anybody has used them in their local compilation, can you please tell me if they are working properly?
What does 0,1,2,3 commands correspond to?
- Fri Apr 23, 2021 3:12 am
- Forum: OpenSees.exe Users
- Topic: Bridge Model with Truss and Beam-Column Elements OR End Moments Release
- Replies: 8
- Views: 6290
Re: Bridge Model with Truss and Beam-Column Elements OR End Moments Release
I think you should also fix out of plane DOF for 3-D truss elements.
For example if the pushover load is in x-y plane the for truss end nodes the fixity should be - fix(0,0,1,1,1,1) - arrest z movement
if the load is in x-z plane then fixity should be - fix(0,1,0,1,1,1) - arrest y movement
For example if the pushover load is in x-y plane the for truss end nodes the fixity should be - fix(0,0,1,1,1,1) - arrest z movement
if the load is in x-z plane then fixity should be - fix(0,1,0,1,1,1) - arrest y movement
- Sat Mar 06, 2021 1:33 am
- Forum: OpenSeesPy
- Topic: Kernel dead with node recorder
- Replies: 3
- Views: 4391
Re: Kernel dead with node recorder
Sorry sir,
Problem solved. The "-" before the "-disp" caused the kernel to be dead. Now its working.
The correct command is:
ops.recorder('Node','-file','disp.txt','-node',2,'-dof',1,'disp')
Problem solved. The "-" before the "-disp" caused the kernel to be dead. Now its working.
The correct command is:
ops.recorder('Node','-file','disp.txt','-node',2,'-dof',1,'disp')
- Fri Mar 05, 2021 10:27 pm
- Forum: OpenSeesPy
- Topic: Kernel dead with node recorder
- Replies: 3
- Views: 4391
Re: Kernel dead with node recorder
Dear Prof.Scott,
This is just the python version of the uniaxial material test
https://opensees.berkeley.edu/OpenSees/ ... 3Q8uvDfkvo
The pattern cab be found in the same link (first line of the code).
This is the code
This is just the python version of the uniaxial material test
https://opensees.berkeley.edu/OpenSees/ ... 3Q8uvDfkvo
The pattern cab be found in the same link (first line of the code).
This is the code
Code: Select all
import openseespy.opensees as ops
import numpy as np
import matplotlib.pyplot as plt
ops.wipe()
ops.model('BasicBuilder','-ndm',1,'-ndf',1)
ops.node(1,0.0)
ops.node(2,1.0)
ops.fix(1,1)
ops.uniaxialMaterial('Concrete01',1,-5.0,-0.002,1.0,-0.004)
ops.element('Truss',1,1,2,1.0,1)
dt = 1
filename = 'pattern1.txt'
factor = 1
ops.timeSeries('Path',1,'-dt',1.0,'-filePath','pattern.txt','-factor',1.0)
print('reached')
ops.pattern('Plain',1,1)
ops.sp(2,1,1.0)
ops.recorder('Node','-file','disp.txt','-node',2,'-dof',1,'-disp')
ops.recorder('Element','-file','force.txt','-ele',1,'force')
ops.system('UmfPack')
ops.constraints('Penalty',1.0e12,1.0e12)
dl = dt
ops.integrator('LoadControl',dl,1,dl,dl)
ops.test('NormDispIncr',1.0e-6,10)
ops.algorithm('Newton')
ops.numberer('RCM')
ops.analysis('Static')
ops.analyze(10000)
disp = np.genfromtxt('disp.txt')
force = np.genfromtxt('force.txt')
plt.plot(disp,force)
plt.show()
- Fri Mar 05, 2021 1:16 am
- Forum: OpenSeesPy
- Topic: Kernel dead with node recorder
- Replies: 3
- Views: 4391
Kernel dead with node recorder
I am using node recorder as
"ops.recorder('Node','-file','disp.txt','-node',2,'-dof',1,'-disp')"
If I comment out this line code runs properly, but if I include this the message shows up - "kernel dead...."___"Restarting kernel"..
Did anyone face this issue..? Can you help me out..?
Thank you.
"ops.recorder('Node','-file','disp.txt','-node',2,'-dof',1,'-disp')"
If I comment out this line code runs properly, but if I include this the message shows up - "kernel dead...."___"Restarting kernel"..
Did anyone face this issue..? Can you help me out..?
Thank you.
- Tue Mar 02, 2021 9:21 pm
- Forum: OpenSees.exe Users
- Topic: large displacement large strain
- Replies: 7
- Views: 7847
Re: large displacement large strain
Can you include that effect in your material model ?
As far as my understanding goes with OpenSees - it is strong in material modelling. So when using OpenSees always think - can I convert this phenomenon into a material model..? At least I tend to think like that - personally.
As far as my understanding goes with OpenSees - it is strong in material modelling. So when using OpenSees always think - can I convert this phenomenon into a material model..? At least I tend to think like that - personally.
- Tue Mar 02, 2021 9:15 pm
- Forum: OpenSees.exe Users
- Topic: ShellMITC4 and zeroLength Element
- Replies: 1
- Views: 2219
Re: ShellMITC4 and zeroLength Element
I think yes. You can give very small rotational stiffness...
- Tue Mar 02, 2021 9:11 pm
- Forum: OpenSees.exe Users
- Topic: Composite Section Using Two Elements
- Replies: 1
- Views: 2250
Re: Composite Section Using Two Elements
Instead of going for two elements - I think it's better to go for two materials in a same beam element cross section. This is possible using fiber section.
https://opensees.berkeley.edu/wiki/inde ... on_Example
See this presentation for visualizing a composite fiber section (slide 24)- this doesn't give the code though. https://openseesforfire.github.io/Downl ... ebinar.pdf
I hope this helps.
https://opensees.berkeley.edu/wiki/inde ... on_Example
See this presentation for visualizing a composite fiber section (slide 24)- this doesn't give the code though. https://openseesforfire.github.io/Downl ... ebinar.pdf
I hope this helps.
- Mon Feb 15, 2021 1:19 am
- Forum: OpenSees.exe Users
- Topic: Step time dependent material
- Replies: 5
- Views: 4248
Re: Step time dependent material
Sorry, here is the image
https://drive.google.com/file/d/1tvaq2V ... sp=sharing
https://drive.google.com/file/d/1tvaq2V ... sp=sharing
- Mon Feb 15, 2021 1:17 am
- Forum: OpenSees.exe Users
- Topic: Step time dependent material
- Replies: 5
- Views: 4248
Re: Step time dependent material
Dear Prof. Scott,
One more question. After formulating the material and running the test analysis(https://opensees.berkeley.edu/OpenSees/ ... U8yPeZbHdU) - I am getting a plot like shown in the figure. Everything is fine - except one point goes somewhere astray... Can you guess the reason behind this ??
Thank you,
Ashok
One more question. After formulating the material and running the test analysis(https://opensees.berkeley.edu/OpenSees/ ... U8yPeZbHdU) - I am getting a plot like shown in the figure. Everything is fine - except one point goes somewhere astray... Can you guess the reason behind this ??
Thank you,
Ashok
- Fri Feb 12, 2021 9:57 pm
- Forum: OpenSees.exe Users
- Topic: Step time dependent material
- Replies: 5
- Views: 4248
Re: Step time dependent material
Thanks a lot. It worked.