Search found 15 matches

by xiell
Thu Jun 05, 2014 2:41 am
Forum: OpenSees.exe Users
Topic: Opensees 2.4.3 + shellMITC4: bug?
Replies: 3
Views: 1747

Re: Opensees 2.4.3 + shellMITC4: bug?

I think it is caused by stress concentration, you can try to subdivide this element, and then apply the vertical load on several top nodes in the central zone.
by xiell
Mon Dec 02, 2013 12:33 am
Forum: OpenSees.exe Users
Topic: Hysteretic material
Replies: 4
Views: 841

Re: Hysteretic material

According to my experience, it's stable, flexible and reliable.
by xiell
Thu Nov 28, 2013 11:05 pm
Forum: OpenSees.exe Users
Topic: Hysteretic material
Replies: 4
Views: 841

Re: Hysteretic material

by xiell
Sun Nov 24, 2013 6:43 pm
Forum: OpenSees.exe Users
Topic: modeling of prestressed concrete
Replies: 2
Views: 996

Re: modeling of prestressed concrete

You can simulate the pre-stresses reinforcing steel in the material level by using steel02.
uniaxialMaterial Steel02 $matTag $Fy $E $b $R0 $cR1 $cR2 <$a1 $a2 $a3 $a4 $sigInit>
define the parameter $siglnit to set the initial stress.
Good luck!
by xiell
Tue Nov 19, 2013 7:19 pm
Forum: OpenSees.exe Users
Topic: self weight
Replies: 2
Views: 607

Re: self weight

In OpenSees, you should define the mass and gravity respectively, you should use uniform load or node load to define the gravity
by xiell
Tue Nov 19, 2013 7:16 pm
Forum: OpenSees.exe Users
Topic: Hysteretic Material
Replies: 1
Views: 405

Re: Hysteretic Material

You can use it to model the hysteretic loop of element (force-disp relationship),or section (such as moment-curvature relationship), or material (stress-strain relationship).
by xiell
Mon Nov 18, 2013 7:24 pm
Forum: OpenSees.exe Users
Topic: indicate formation of plastic hinges in FBE, fiber section
Replies: 5
Views: 1192

Re: indicate formation of plastic hinges in FBE, fiber secti

Thank you for your generous help!
Appreciate.
by xiell
Mon Nov 18, 2013 9:17 am
Forum: OpenSees.exe Users
Topic: indicate formation of plastic hinges in FBE, fiber section
Replies: 5
Views: 1192

Re: indicate formation of plastic hinges in FBE, fiber secti

If we want to get the length of the plastic hinge as accurate as possible, maybe we should subdivide the specimen into several elements or increase the number of integration points. But this will bring some other issues such as convergence problem and soften phenomenon. Dear Scott, would you like to...
by xiell
Mon Nov 18, 2013 6:30 am
Forum: OpenSees.exe Users
Topic: indicate formation of plastic hinges in FBE, fiber section
Replies: 5
Views: 1192

Re: indicate formation of plastic hinges in FBE, fiber secti

I think this quite relys on the distribution of the integration points and the discretization of the specimen.
I'm also interested in this topic.
by xiell
Sat Nov 16, 2013 10:02 pm
Forum: OpenSees.exe Users
Topic: progressive collapse in opensees
Replies: 27
Views: 8494

Re: progressive collapse in opensees

Hi, everyone. I have also done some research on progressive collapse based on OpenSees recently. Firstly, for the model based on fiber element, you can use Steel02 and fatigue at the same time, because fatigue material does't change the stress-strain relationship of any material, just when the damag...
by xiell
Sat Nov 16, 2013 8:30 am
Forum: OpenSees.exe Users
Topic: Modified Ibarra-Medina-Krawinkler Deterioration Model
Replies: 6
Views: 1942

Re: Modified Ibarra-Medina-Krawinkler Deterioration Model

I have also done some research on this model, I think it is not due to the accumulation stuff. This model really works well in all static analysis, only not fit for dynamic analysis.
by xiell
Sat Nov 16, 2013 8:12 am
Forum: OpenSees.exe Users
Topic: Limit on Maximum Number of Recorders
Replies: 10
Views: 2157

Re: Limit on Maximum Number of Recorders

Dear frank, I also did some tests, it worked in the new version 2.4.2. I just wonder in which version you have implemented this command because I have checked the change log, but i can't find corresponding information. Thank you!
by xiell
Sat Nov 16, 2013 8:08 am
Forum: OpenSees.exe Users
Topic: How to model a frame-shear wall structure in 3D?
Replies: 16
Views: 7736

Re: How to model a frame-shear wall structure in 3D?

In the new version 2.4.2, a new shear wall model, multi-layer shell element, has been developed and implemented in OpenSees. 1)The detailed informations and some examples can be found on this website: http://www.luxinzheng.net/download/OpenSEES/En_THUShell_OpenSEES.htm we hope this will help you rep...
by xiell
Sat Nov 16, 2013 7:53 am
Forum: OpenSees.exe Users
Topic: Layered Shell
Replies: 6
Views: 2597

Re: Layered Shell

Hi, AHARSHIAN, I'm a PHD student of Prof. Lu who developed this element. If you have any further question about the new shear wall element, please don't hesitate to contact with me!
by xiell
Sat Nov 16, 2013 7:41 am
Forum: OpenSees.exe Users
Topic: rigid diaphragm
Replies: 7
Views: 2402

Re: rigid diaphragm

Firstly, rigid diaphragm can only be utilized in 3D model. Secondly, if you want to restrict the displacement of four nodes, you can add two truss elements with large axial stiffness between two nodes in the diagonal derection. I have validated the reliability of this method both in 2D and 3D model,...