about zerolengthcontact3D

[yinxia3690]

Dear everyone,
I need the zerolengthcontact3D in my bridge model which is 6DOF.I release DOF like this "equalDOF 55 81 1 2 3",but I always got the warning "WARNING ZeroLengthContact3D::setDomain cannot handle 6dofs at nodes in 6 d problem". Why?I don't know what's the matter.
Are you sure I coulde release DOF of the zerolengthcontact3D element like that of the beamcolomn element?
Thank you !

[vesna]

Would you try to make and post a 3D cantilever column model with zerolengthcontact3D so I can understand what you are doing.

[yinxia3690]

wipe;
model BasicBuilder -ndm 3 -ndf 6;
#
#3----------4 7----------8
# 2| 6|
# | |
# | |
# |1 |5


node 1 -20 0 0;
node 2 -20 60 0;
node 3 -40 60 0;
node 4 0 60 0;

node 5 20 0 0;
node 6 20 60 0;
node 7 0 60 0;
node 8 40 60 0;

#zeroLenghtContact3Ddummy node
node 9 0 60 0;
node 10 0 60 0;


fix 1 1 1 1 1 1 1;
fix 5 1 1 1 1 1 1;

equalDOF 4 9 1 2 3;
equalDOF 7 10 1 2 3;

set GJ 1.0e20;
geomTransf Linear 3 0 0 1;
element elasticBeamColumn 1 1 2 3.5 3.45e10 1 $GJ 2.475 0.2605 3;
element elasticBeamColumn 2 3 2 3.5 3.45e10 1 $GJ 2.475 0.2605 3;
element elasticBeamColumn 3 4 2 3.5 3.45e10 1 $GJ 2.475 0.2605 3;
element elasticBeamColumn 4 5 6 3.5 3.45e10 1 $GJ 2.475 0.2605 3;
element elasticBeamColumn 5 7 6 3.5 3.45e10 1 $GJ 2.475 0.2605 3;
element elasticBeamColumn 6 8 6 3.5 3.45e10 1 $GJ 2.475 0.2605 3;
element zeroLengthContact3D 7 9 10 1.5e5 1.5e5 0 0 0
puts "done"


This is my test model.Still,I got the warning "WARNING ZeroLengthContact3D::setDomain cannot handle 6dofs at nodes in 6 d problem". Please tell me why.
Thank you very much.

[vesna]

zerolengthcontact3D element can be used to connect brick elements but not beam column elements. That is why you get the message that it can not handle 6 dofs at node.

[yinxia3690]

Then how could I do?
My bridge is composed of beam column element,and I must consider the contact.So any suggestions?
Thank you!

[yinxia3690]

OK, I decide build the bridge using brick element,so I think this problem could be solved.
But I have another question:how could I consider the mass in the brick element?
Thank you!

[yinxia3690]

I knew how to consider the mass in the Brick element.
I am so sorry to disturb you,but my mannual is out of time!