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Can I use truss element connect one node with 3 ndf and other node with 6 ndf? Can I use zero-length element in this condition? Beside equalDOF which command can do this. I try to use rigidLink (rod) bar... ... failed. I already get results with equalDOF. But my prof. let me try something else to co...

Hi, ALL I need write a function by tcl to find all nodes within a certain scale, which was defined by a center node and 3 distance in 3 direction respectively. My problem is how to looking for the node number from global coordinate and how to get a certain node’s coordinate in tcl file. I'm familar ...

Actually I already enter Boris website though I forget to mention. Thanks Silvia wake me up that I should enter there again with more clear purpose. Thanks for Boris. I also readed Bathe's book "Numerical Methods in Finite Element Analysis" while developing a program for eigen value of bea...

Thanks a lot! So I plan set a if-else statement to make sure the node's order for different brick elements. It is great since I should add some more parameter to Brick8N element. At same time I plan to modify my tcl file to avoid repeat element command too much times. Another question is where I can...

I wonder why node's order of stdBrick is different with other brick elements? I set the variable "stdsoil" to consider the brick element. Firstly use stdBrick to bulid up the model. I plan later change the brick element Bbarbrick or other 8 points brick element. Since I notice that all the...

In my model, soil nodes and pile nodes are not exactly same coordinate, because the model is very complex. There're 24 foundations, each has 4 equivalent piles (different distance). The field including 19 layers soil. In order to simplify the model, the soil nodes be put in the center of 4 piles nod...

Thanks Berktaftali, I searched and found that message. I will try it.
The answer is from Boris
Take a look at solid02.tcl file in ExampleScripts, it does what you need...

I has another problem since it is a Soil-Structure-Interaction analysis. The upper structure and pile foundations were modeled by 3D beam elements and shell elements (ndm 3 ndf 6). How to combine these elements (ndf 6) with the brick elements (ndf 3) together? Could I use ndf 6 to consider the brick...

Thanks a lot, The Simlified model really work after I change ndf 3. Since the model is very big, around 4800 nodes and 4000 elements for the soil part. Could you please help me guess how long it takes to calculated the first 4 eigen value? I tried to run opensees in my computer. 3 hours later, I did...

The following is a simplified model. I've also sent you an email. Thanks a lot for your kind help. # onlySoilFreeSim.tcl # writen by jianping SUN # eigen value for simple free-field model wipe puts "**********************************************************" model BasicBuilder -ndm 3 -ndf ...

I used stdbrick elements in my model. So there is no zero-mass DOF except rotation degree, but I do not known how to add mass to rotation DOF. The model is complex, which includes several tcl files. I will try to simplify it and then post it. By the way, is there any way to attached several files wi...

While using OPENSEES setup a model to calculate eigen, I got a warning message: WARNING FE_Element::setID() - numDOF and number of dof at the DOF_Groups. After the warning, I got several error/warning messages: * BandArpackSolver::Error in dgbtrf_ * Warning FrequencyAlgo::solveCurrentStep() - the Ei...