Search found 84 matches

by Gholamreza
Fri Mar 05, 2021 7:00 am
Forum: OpenSees.exe Users
Topic: Overturning moment and Resisting Moment
Replies: 1
Views: 475

Overturning moment and Resisting Moment

Hello Engineers, I have modeled 20-story-5bays building with core wall. I'd like to calculate 1. Overturning moment and 2. Resisting Moment in Opensees? 1. Overturning moment: Should I calculate the shear of each floor (sum of shear forces in all columns in each story) x (distance from the base) ? 2...
by Gholamreza
Mon Feb 15, 2021 3:28 pm
Forum: OpenSees.exe Users
Topic: Support for a new damper
Replies: 2
Views: 1236

Re: Support for a new damper

$matTag_SD is my new material I developed in c++. My question is about the support of this damper! In the aim of simplicity, let say we use dashpot or Viscous material, uniaxialMaterial Viscous, instead of $matTag_SD......my question is if the way I use to mount the new damper/dashpot is correct? I ...
by Gholamreza
Wed Feb 10, 2021 7:46 am
Forum: OpenSees.exe Users
Topic: Support for a new damper
Replies: 2
Views: 1236

Support for a new damper

Hello everyone, I have developed a new material(C++) for a new damper to implement in OpenSees. The new damper does not have stiffness, like a dashpot, and I need to have a chevron frame as support to mount the damper but instead of chevron frame I modeled a very rigid link....... Is this the right ...
by Gholamreza
Tue Feb 09, 2021 3:20 pm
Forum: OpenSees.exe Users
Topic: The tolerance criteria used to check for convergence
Replies: 3
Views: 945

Re: The tolerance criteria used to check for convergence

Thanks selimgunay, I am using adaptive strategies you shared before but it seems it has to reduce the tolerance in almost every steps to converge....is this shows my model has some issues? I developed a new yielding material in C++ and I am using that in 9-story building.....the new material works j...
by Gholamreza
Mon Feb 08, 2021 3:20 pm
Forum: OpenSees.exe Users
Topic: The tolerance criteria used to check for convergence
Replies: 3
Views: 945

The tolerance criteria used to check for convergence

Hello Engineers, Can anyone tell me what is the best value for the tolerance in: test NormDispIncr $tol $iter <$pFlag> <$nType> I assume the smaller value, the more accurate response I get but I might face convergence issues. I modeled 9 story benchmark building, yielding material and I am using 1.0...
by Gholamreza
Wed Jan 27, 2021 6:47 am
Forum: OpenSees.exe Users
Topic: Equivalent viscous damping for new damper
Replies: 1
Views: 770

Equivalent viscous damping for new damper

Hello Engineers, I developed a new yielding material for a new damper in C++/Opensees which works just fine and the results are verified with MATLAB. I would like to evaluate the efficiency of this new damper in tall buildings but I don't know how many dampers per floor should I use!!.... is there a...
by Gholamreza
Fri Jan 08, 2021 11:29 am
Forum: OpenSees.exe Users
Topic: getStrainRate for velocity in new material
Replies: 1
Views: 712

getStrainRate for velocity in new material

Hello everyone,

I am trying to develop new material in c++. I am wondering if the getStrainRate(void) method is the right method to get velocity in my new material?
by Gholamreza
Wed Jan 06, 2021 6:20 pm
Forum: OpenSees.exe Users
Topic: SDOF with a dashpot
Replies: 3
Views: 1006

Re: SDOF with a dashpot

thank you selimgunay. this works. Why do I get different response when I put have nonlinear material there?
by Gholamreza
Wed Jan 06, 2021 7:25 am
Forum: OpenSees.exe Users
Topic: SDOF with a dashpot
Replies: 3
Views: 1006

SDOF with a dashpot

Hello Engineers, I have a very simple question that gets on my nerve: I want to model a SDOF structure with a dashpot (viscous material) and compare the response with MATLAB but I think I am making a mistake somewhere. Here is the code: ###############################################################...
by Gholamreza
Sat Jan 02, 2021 9:51 am
Forum: OpenSees.exe Users
Topic: Stiffness of new material (getTangent)
Replies: 2
Views: 819

Re: Stiffness of new material (getTangent)

Awesome, thanks. In order to calculate the force of the damper, I need to compute the velocity, v, and sign of the velocity, sgn(v). in order to that I use getStrainRate(void) to calculate velocity and signum(TVel): TVel = strainRate; double SandDamper::getStrainRate(void) { return TVel; } F = pR^2 ...
by Gholamreza
Thu Dec 31, 2020 7:49 am
Forum: OpenSees.exe Users
Topic: Stiffness of new material (getTangent)
Replies: 2
Views: 819

Stiffness of new material (getTangent)

Hello everyone, I am developing a new material for a novel damper and the force of the damper is: F = pR^2 [sgn(v) + z]; where p is pressure, R is length, v is velocity and z is the same as parameter z in Bouc-Wen model (I understand pR^2 has the unit of the force ). I have a hard time understanding...
by Gholamreza
Wed Dec 30, 2020 7:57 am
Forum: OpenSees.exe Users
Topic: New Material
Replies: 1
Views: 709

New Material

Hello Engineers, I am trying to develop a new material similar to Bouc-Wen Material but when I run for a SDOF in opensees I keep get this error WARNING: NewMat::setTrialStrain() -- did not find the root z_{i+1}, after 20 iterations and then after: 100 iterations current Norm: 6.37412e-09 (max: 1e-09...
by Gholamreza
Sun Dec 20, 2020 2:00 pm
Forum: OpenSees.exe Users
Topic: Bouc-wen model and ZeroLength Element
Replies: 3
Views: 885

Re: Bouc-wen model and ZeroLength Element

Thanks for your prompt response. I already did that. I connect nodes#1 and #2 by elastic material and nodes #2 and 3 by bouc-wen material assigned to zeroLength element. here is the related part of the code: ############################################################################################...
by Gholamreza
Sun Dec 20, 2020 8:50 am
Forum: OpenSees.exe Users
Topic: Bouc-wen model and ZeroLength Element
Replies: 3
Views: 885

Bouc-wen model and ZeroLength Element

Hello Engineers, I was wondering if we can assign Bouc-wen material to ZeroLength elements???? I tried but it seems the Bouc-wen material is ignored!! I use the following: (node#1)..........Elastic Material...............(node#2)Bouc-wen material(node#3) nodes #2 and #3 are connected with a ZeroLeng...
by Gholamreza
Mon Nov 02, 2020 3:03 pm
Forum: OpenSees.exe Users
Topic: Bouc-Wen Model
Replies: 1
Views: 465

Bouc-Wen Model

Hello Engineers, Can anyone explain how OpenSees calculate the yielding displacement (uy), yielding force (Fy), and also strength (Q) of structure when we use Bouc-Wen material? let say we have a SDOF structure with BW material with the known initial stiffness (ko) how to find the yielding point? Ob...