new Joint element

For developers writing C++, Fortran, Java, code who have questions or comments to make.

Moderators: silvia, selimgunay, Moderators

Post Reply
CMiculas
Posts: 27
Joined: Wed Oct 25, 2017 6:23 am
Location: University of Coimbra

new Joint element

Post by CMiculas » Tue Feb 05, 2019 5:12 am

Dear Community Members,

I am trying to build a 4 nodes joint model, based on BeamColumnJoint2D element.
After creating and loading a frame using the joint created, it looks like the 4 nodes are not connected.
I thought the error comes from setDomain() function but it's not.
Does anyone of you have an idea where my bug could be?
Thank you in advance:

photo: before loading https://www.dropbox.com/s/j4ira0ct6m0ul ... oading.PNG
photo: after loading https://www.dropbox.com/s/z87jywsb71kf7 ... oading.PNG

CMiculas
Posts: 27
Joined: Wed Oct 25, 2017 6:23 am
Location: University of Coimbra

Re: new Joint element

Post by CMiculas » Tue Feb 26, 2019 4:17 am

This is the setDomain() method.
The 4 nodes are identified, but somehow the element is created only with 2 node. Any ideas?

void
SPPlastic::setDomain(Domain *theDomain)
{
if (theDomain == 0)
{
opserr << "ERROR : SPPlastic::setDomain -- Domain is null" << endln;
return;
}

// first ensure nodes exist in Domain and set the node pointers
Node *end1Ptr, *end2Ptr, *end3Ptr, *end4Ptr;

int Nd1 = connectedExternalNodes(0);
int Nd2 = connectedExternalNodes(1);
int Nd3 = connectedExternalNodes(2);
int Nd4 = connectedExternalNodes(3);

opserr << "Nd1" << Nd1 << endln;
opserr << "Nd2" << Nd2 << endln;
opserr << "Nd3" << Nd3 << endln;
opserr << "Nd4" << Nd4 << endln;

end1Ptr = theDomain->getNode(Nd1);
end2Ptr = theDomain->getNode(Nd2);
end3Ptr = theDomain->getNode(Nd3);
end4Ptr = theDomain->getNode(Nd4);

if (end1Ptr == 0) {
opserr << "WARNING DoublePanel::setDomain() - at DoublePanel " << this->getTag() << " node " << Nd1 << " does not exist in domain\n";

return; // don't go any further - otherwise segmentation fault
}
if (end2Ptr == 0) {
opserr << "WARNING DoublePanel::setDomain() - at DoublePanel " << this->getTag() << " node " << Nd2 << " does not exist in domain\n";

return; // don't go any further - otherwise segmentation fault
}
if (end3Ptr == 0) {
opserr << "WARNING DoublePanel::setDomain() - at DoublePanel " << this->getTag() << " node " << Nd3 << " does not exist in domain\n";

return; // don't go any further - otherwise segmentation fault
}
if (end4Ptr == 0) {
opserr << "WARNING DoublePanel::setDomain() - at DoublePanel " << this->getTag() << " node " << Nd4 << " does not exist in domain\n";

return; // don't go any further - otherwise segmentation fault
}
nodePtr[0] = end1Ptr;
nodePtr[1] = end2Ptr;
nodePtr[2] = end3Ptr;
nodePtr[3] = end4Ptr;

// call the base class method (DomainComponent class method) THIS IS VERY IMPORTANT
this->DomainComponent::setDomain(theDomain);

// ensure connected nodes have correct number of dof's
int dofNd1 = nodePtr[0]->getNumberDOF();
int dofNd2 = nodePtr[1]->getNumberDOF();
int dofNd3 = nodePtr[2]->getNumberDOF();
int dofNd4 = nodePtr[3]->getNumberDOF();


if ((dofNd1 != 3) || (dofNd2 != 3) || (dofNd3 != 3) || (dofNd4 != 3))
{
opserr << "ERROR : SPPlastic::setDomain -- number of DOF associated with the node incorrect"<< endln;
exit(-1); // donot go any further - otherwise segmentation fault
}

// now determine the area
const Vector &end1Crd = nodePtr[0]->getCrds();
const Vector &end2Crd = nodePtr[1]->getCrds();
const Vector &end3Crd = nodePtr[2]->getCrds();
const Vector &end4Crd = nodePtr[3]->getCrds();

Vector Node1(end1Crd);
Vector Node2(end2Crd);
Vector Node3(end3Crd);
Vector Node4(end4Crd);


// set the height and width of the element and perform check
Node2 = Node2 - Node4;
Node3 = Node3 - Node1;

dc = fabs(Node2.Norm());
db = fabs(Node3.Norm());

opserr << "dc: " << dc << endln;
opserr << "db: " << db << endln;

Aweb = (sqrt(db*db))*(sqrt(dc*dc));
Alpha = atan(fabs(Node3.Norm()) / fabs(Node2.Norm()));

opserr << "Aweb: " << Aweb << endln;
opserr << "Alpha: " << Alpha << endln;

if ((db <= 1e-12) || (dc <= 1e-12))
{
opserr << "ERROR : SPPlastic::setDomain -- length or width not correct, division by zero occurs"<< endln;
exit(-1); // donot go any further - otherwise segmentation fault
}

getBCJoint();
getdg_df();
getdDef_du();
}

peterlee
Posts: 4
Joined: Thu Jan 24, 2019 9:53 pm
Contact:

Re: new Joint element

Post by peterlee » Thu Apr 18, 2019 4:11 am

Thanks for giving the deatail.

radekos
Posts: 2
Joined: Thu Mar 04, 2021 8:59 am
Contact:

Re: new Joint element

Post by radekos » Thu Mar 04, 2021 9:03 am

it is a bug:

getBCJoint();
getdg_df();
getdDef_du();
}

more } add

sahrahurma
Posts: 1
Joined: Sat Apr 10, 2021 7:18 am
Location: türkiye
Contact:

Re: new Joint element

Post by sahrahurma » Sat Apr 10, 2021 7:22 am

Thanks

Post Reply