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hi,
can anyone tell me the function of rigidlink?
what is the difference between rigidlink and equalDoF?

Plus can I use both commands in a model like:
equalDoF 5 7 1 2
rigidLink beam 6 7

Dear Silvia,

I didnt get your point of veiw. could you please explain me in a simple way, as I am a new user.

Kind Regards

Shahram

yes, it should be.

Dear Silvia, Thanks alot for reply. As you mentioned in the previouse email, I have corrected the mistakes in the attached files but when the cyclic loading is applied, it does the analysis only for 1 cycle ad after 1 cycle there are errors in the analysis as follows: WARNING - ForceBeamColumn2d::up...

but in a 2d model which means it has 3 degree of freedom, we can not talk about 6th direction.
plus in my own model which is in 2d, I get error when I have zero length in 6th direction.

hi , In the limit state material model "CenterCol_basicModel.tcl" in the manual, the structure was modelled as a 2D structure (which means every node has 3 DOF’s) but in the definition of zero length elements they used 6th direction which is as followed: # Define the zero-length end spring...

Dear Silvia, is this comment correct: for modelling rotational spring, we need to tell the program direction 3 instead of 6, like: element zeroLength 2 1 3 -mat 4 -dir 3 Another question is in the example of limit state material, Ken used 2D model and with " -ndm 2 -ndf 3" and for introduc...

using model builder for a 2D problem,
model BasicBuilder -ndm 2 -ndf 3
which mean that we have trasfomation in X and Y direction and rotation in Z axis.
how the program knows that the third one is rotation in Z axis(direction 6)?

especially when we need to model rotational spring in direction 6?

Dear Silvia, My model is a 2D model and using ur manual, page 387 says that "For a 2-D problem, you really only need three degrees of freedom at each node, the two translations in the plane and the rotation about the plane's normal: model basic -ndm 2 -ndf 3" and in my model direction 6 is...

and when I run the model I have error message as below: OpenSees > source slab.tcl WARNING LagrangeMP_FE::setID(void) - unknown DOF 5 at Node WARNING LagrangeMP_FE::setID(void) - unknown DOF 5 at Node WARNING LagrangeMP_FE::setID(void) - unknown DOF 5 at Node WARNING LagrangeMP_FE::setID(void) - unk...

Dear Silvia,

I dont understand what do u mean. As I know I have 2 transormational in X & Y direction and 1 rotational in Z axis

# Example 3. 2D Cantilever -- Build Model # nonlinear Slab-Column Connction, uniaxial inelastic section # Shahram Derogar, Feb. 2008 # Sheffield - UK # # ^Y # 7 | Number----Node # | __ | ()---- Element # (4)| | # | |hCol # (5) | (6) | # 4------------ 5 -----------6>x|-- # | | # |(3) |hCol # | | # (1...

Dear Frank,
I have sent the file to ur email and waiting for your reply and thanks in advance for ur help.

can any body tell me what does this error means: OpenSees > source slab.tcl WARNING PenaltyMP_FE::setID(void) - unknown DOF 5 at Node WARNING PenaltyMP_FE::setID(void) - unknown DOF 5 at Node WARNING PenaltyMP_FE::setID(void) - unknown DOF 5 at Node WARNING PenaltyMP_FE::setID(void) - unknown DOF 5 ...

Dear Silvia,

do you know how can I ask the program to record the force in a specific node? As I am doing a reversed cyclic analysis and I apply a lateral force to a specific node.