The OpenSees Community

Hi, everyone: I am running a 3D problem and it is taking a long time to get a converged solution. I was playing with the "algorithm" command and was thinking about using iterative solvers, but did not get anything to work other than "Linear" and "Newton". Any helps? Tha...

why don't you give an example of what you want to control and people can take a look.

Hi, I was wondering how spring can be modeled in OpenSees. What I need is to simulate Winkler's foundation under PCC slab. After looking and playing around, I found a way to accomplish this using the ZeroLength element in OpenSees. Basically I add a shadow node that has the same coordinates as the n...

Thanks Frank! That sure clear things up.

Next time I will first go into the constructor and there I will find which types of materials are supported.

I was looking at the code for FourNodeQuad, it appears to me that this element is not ready for axisSymmetric materials. AxisSymmetric materials takes a strain vector of four components, but FourNodeQuad is only giving three as in the member function "update". Besides, when calculating ele...

Got it. Thanks Frank!

Thanks Frank! But that is not true. Looking at the code below where deltaLambda is determined, it doesn't matter whether Jd is specified or not. If it is not specified, it will just be 1. However, I could just specify dLambdaMin and dLambdaMax to be exactly the same as the time step I want. But this...

well, it wouldn't work because you are invoking the standard Tcl shell, not OpenSees.

try running OpenSees in command prompt and use:

source ???.tcl

Hi, I want to do a static analyses where time increments uniformly with a given interval. However, I just found out that in OpenSees, time step dLambda is first determined by: dLambda(i) = dLambda(i-1)*Jd/J(i-1) where J(i-1) is the number of iterations it took to reach convergence for the previous s...

You seem to have the wrong Tcl Version, it has to be 8.4 and has the following flag for compilation

/D "_TCL84"

Thanks Silvia!

I was thinking an element should be able to know how to do the N(x)Tau(x)ds integral. I just need to ask all the element that has edges aligned with the supplied conditon to provide the equivalent nodal load. And then use the "load" command to actually add these nodal loads.

Looks like eleLoad has similar functionality, but is limited to single element and beams only.

I come to OpenSees as a FEAP user and want to use OpenSees to do some solid structure modeling, not just beam column. I miss the ability to add patch loads and add constraints by supplying edge etc. In case it is not listed in the online manual, does OpenSees provide a way to specify traction bounda...

I had the same question and Frank gave me answers on another post:

http://opensees.berkeley.edu/community/ ... php?t=4538

Hope this helps.

I believe it is just a matter of setting the right path for header files as well as library files. Looks like your studio might not be installed correctly. Try do a file search for the missing .h and .lib files, and add the corresponding path into the studio. This can be found in "Tools"->...