The OpenSees Community

Hi, all:

For the zerolength section element, we can input a fiber section to it. For this fiber section (eg. a reinforced concrete section), what we input should be a stress-strain of the material or force-deformation (use strain*plastic hinge length) of the material? Thank you for your help.

Hello, All: I have a quick question on modal analysis of a column in 3D domain. I built an elastic column in 3D domain. I fixed the column base and assign the mass to every node along the column in x direction. When I tried an eigen value analysis, it is very interesting that the first 6 modes are a...

Hello, all:

I have a question on using zerolengthsection element in 2D. I think the default orientation of zerolengthsection in 2D is horizontal x axis. If I want to change the orientation to vertical direction, is there anyone help me how to define the orientation vector?
Thank you for the help.

fmk wrote: > the results are only as good as your model .. as you are gettign > unreasonable results, your model is probably poor .. for example you talk > about buckling, but you will not get a single column to buckle unless you > create a model which will allow it to do so, which typically involes...

fmk wrote: > do you want to start over from scratch or from the state at the end of the > last analysis? Hello, Frank: I have similar question here. If I want to change the material property of steel02 (steel01, elastic material) at the end of one analysis (let's say Analysis 1), and then continue t...

Hi, Frank, Thank you for the help. Now I met a problem in getting element deformation. I saw the following codes in "RotationShearCurve.cpp" for getting the element force. void RotationShearCurve::getElemForces(void) { int trash; const char *forceType2[1] = {"localForce"}; Respon...

Hi, Frank: I met a problem on writing new material now. [I want to write a material which is able to adjust its constitutive depends on the element response (like stress and strain)] I wrote the new material and new criterion (the calculation inside the material depends on the information from crite...

Hi, Frank. Thank you very much for this help. Have a good time in Alaska.

Hi, Ssami: I am sorry, I also have no idea how to get the exact same flag shape in the paper.

Hi, Frank, Thank you for the reply. I did compile OpenSees successfully before adding the code. May I send my source code and relative changes in other files to you to see if you have time to have a look at it? I appreciate the help.

Hi, Ssami: My pleasure. From the paper, it seems the initial stiffness is super big, and the unloading part shoot even lower than the yield point. In my opinion, there are two options, one is parallel the Self-Centering with a very rigid elastic material, use this rigid material to model the initial...

Hi, Ssami:
Is it possible to get your wanted flag material by changing the parameters in the self-centering material? Is the shape of the 4th hysteresis pic what you are looking for?

Hi, Frank, thank you very much for replying. Sorry, please let me explain the steps I did first: the material I wrote is added to the whole source code which downloaded from website. It is R5621. I added TSCriterion.h and TSCriterion.cpp to the folder 'limitCurve', and I added TSLimitStateMaterial.c...

Hi: I followed the tutorial on adding new material. I wrote the new rule of judging criterion with the name 'TSCriterion.cpp', and a new material has relation to this rule with the name 'TSLimitStateMaterial.cpp'. I wrote the first part of the cpp following the way PinchingLimitStateMaterial.cpp, so...

No, Frank. I will try the newest revision. But I built this version successfully in a Win 8 PC, I don't know the reason why... By the way, I have another question regarding to the Node.cpp file. I saw the following in setTrialDisp, but I really didn't get why make the disp vector in the following wa...