The OpenSees Community

why are you doing the condensation .. you should just leave it as a 3 noded element .. people leave the 27 noded brick and 9 noded quad as is w/o any condensation .. when you get to transient analysis you are not gonna get what you expect if you do the static condensation .. (A+B)^-1 != A^-1 + B^-1

the ElasticIsotropicMaterial can take 4 args .. rho is the 4'th .. if pass it 3, rho is taken to be 0.0 .. hence 0 mass .. have a look at the material header file.

you can also use the logFile <fileName> command in the script .. this does pretty much the same thing .. the o/p appears on the screen and is also sent to a file .. only output after logFile command appears.

multi-point constraints do work with equalDOF .. it's just that you have to be careful as we don't follow constraints with transformation, e.g. if one node is constrained to another which is constrained to another.

don't know how .. why do you need the basic stiffness in getBasicIncrDisp()? .. if you do
need it and this may happen again we might need to change our interface.

the message that is printed out is not an error .. just a print statement someone left in to check on memory requirements .. do you have any
mass defined?

are you asking if OpenSees can handle 'polyhedral cells with N faces' elements or are you asking if there are any existing elements in OpenSees that can be used to
create your model if your mesh generator outputs n-cells? .. if the question is the first then yes you can, if the second then no.

excuse my ignorance .. but what are n-cells?

it does beceause i was playing around with graphics awhile back to see what i could do easily .. there has since been a PEER sponsored project to provide some graphics .. nothing has yet come of it.

no .. you can record the plasticRotation at the elements .. we don't mention the graphics in the manual because that area needs some work and we don't have the resources to work on it.

no you don't have to do a gravity load analysis.

the examples do gravity analysis befor a transient because most people would want to perform a gravity load analysis before transient .. we are just showing them how it would be done.

how many nodes do you have .. and what is the largest node number you have?

i try and upgrade the windows .exe after some important bug fix or after enough new features have been added .. typically about once a month or so .

you will see (i hope) an out-of-memory message .. there is no fixed limits on model sizes in OpenSees .. all memory is requested from the heap .. in the code we try to ensure that after every call to the os for more memory,we check that memory was available .. if no memory is avail we (i hope) print...

did you install the tcl files in the correct location .. you cannot take the default tcl installation paths .. you have to set it as shown in the getting started guide.