rigid offset option in 3D corotational transform

[seocy]

Hi, User,

I encountered a problem with rigid offset in 3D corotational transformation.
I am in the middle of creating a 3D frame model. Before creating elements, I checked whether nodes and geometric transformation were properly defined. I used Corotational transformation with jntOffset option but OS warned "rigid joint zones not implemented yet" and assigned zero values. Does corotCrdTransf actually have an option for joint offset? Thanks always..

[seocy]

I briefly looked into the source code for 3D corotational transformation. I found in the CorotCrdTransf3d.cpp that rigidoffsets are set to be zero in the constructor regardless of input command.

Code: Select all

// constructor:
CorotCrdTransf3d::CorotCrdTransf3d(int tag, const Vector &vecInLocXZPlane,
                                   const Vector &rigJntOffsetI,
                                   const Vector &rigJntOffsetJ):CrdTransf3d(tag, CRDTR_TAG_CorotCrdTransf3d),
vAxis(3), nodeIOffset(3), nodeJOffset(3), xAxis(3),
nodeIPtr(0), nodeJPtr(0), R0(3,3), L(0), Ln(0), 
alphaIq(4), alphaJq(4), 
alphaIqcommit(4), alphaJqcommit(4), alphaI(3), alphaJ(3),
ulcommit(7), ul(7),  ulpr(7),
nodeIInitialDisp(0), nodeJInitialDisp(0), initialDispChecked(false)
{


...
    // temporary
    if (nodeIOffset.Norm() != 0 || nodeJOffset.Norm() != 0)
    {
        opserr << "CorotCrdTransf3d::CorotCrdTransf3d: rigid joint zones not implemented yet\n";
        opserr << "Using zero values\n"; 
        nodeIOffset.Zero();
        nodeJOffset.Zero();
    }
...

Isn't it a bug? or Am I wrong to interpret the code? It says no matter what, the constructor sets nodeoffsets to be zero. Thanks for your comment in advance.

[fmk]

it has warning said has never been implemented.