Rigid Diaphragm Constraint

1

Hi,

I seen CalculiX is growing rapidly to support dynamic analysis, for example in Mass and Base Motion features were implemented later. This can give large benefit and useful feature to conduct analysis of structure subjected to ground displacement e.g earthquake.

However, another important implementation of Rigid Diaphragm Constraint is not currently available. It simplified the model and reduced significantly in computational times, the constraint type may similar to Rigid Body or MPC Plane with some exception Dof’s released for out of plane displacement and rotation.

Hopefully, the developer or anyone experts in coding are interested to implement in the future of CalculiX.

Regards,

1 Like
2

Isn’t this the same as ?¿

*COUPLING
*KINEMATIC
1,2

3

Kinematic coupling can be similar in case of distributing concentrate loads, but it seems to be not in motion of a plane in global system. Another awareness from Abaqus user reporting in singularity… Even though i will try these approach in CalculiX about the possibility and limitation. Still using direct constraint of rigid diaphragm could make it more clear and useful.

4

It seems possible by Maximum distance MPC, there are fictitious nodes can be used as master and placed in the center of mass in each floor.

Need to define manually one by one, a bit different with Rigid Diaphragm definition by group of node as a slave.

Interesting to try, so many thanks.

5

HI Xyont,

This is an idea for rigid diaphragm that allows out of plane rotation, and it only takes one element and simple GUI definition for the whole set of nodes to build it.

What do you mean by out of plane displacement.? Do you have a real physical example I can visualize so maybe I can find how to generalize?

Run takes 15 sec on my laptop.

Regards

imagen
imagen504×625 4.06 KB

EDITED: inp Updated

6

Thanks @Disla about the ideas,

but, I’ll always keep away from stiffness modification to avoid numerical stability or unexpected behavior.

I look again, it seems more appropriates by generic approach using *Equation instead,

Diaphragm Constraint is commonly used to model of building structures, below figures taken from OpenSees and the explanation can be found here.

896
896460×550 21.7 KB

the command look like:

2023-08-11 05_17_06-Example5.1.tcl - SciTE
2023-08-11 05_17_06-Example5.1.tcl - SciTE759×397 25.7 KB

Translation of a rigid plane (floor) in X and Y direction is dependent to master node (9,14,19) and lead to consequently in beam axial force to be zero. Rotation in Z direction also, another DOF’s are independent of each other.

7

I see . Attached reviewed model. I’m not stiffening , the diaphragms are rigid bodies.
Why is beam axial force zero?. If each side is constrained at a fixed z and each side moves differently in horizontal direction , the beam is stretched.
¿Why is DZ constrained?. Doesn’t that remove all vertical Dead and Live Loads and any possibility of buckling on the columns?
Anyway, that’s another subject. I think this could be an equivalent model.

Rigid-Diaphragms

** Generated by Mecway 21.0
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*TIE,NAME=T_3,POSITION TOLERANCE=0.001
Slave2,Master2
*TIE,NAME=T_4,POSITION TOLERANCE=0.001
Slave3,Master3
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*RIGID BODY,NSET=Rigi2 ,REF NODE=103  ,ROT NODE=106
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0.0001,0.1,0,0.0005
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1,2,,1
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2,2,,1
*BOUNDARY,AMPLITUDE=A_1
3,2,,1
*BOUNDARY,AMPLITUDE=A_1
4,2,,1
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EAll,GRAV,0,1,0,0
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EAll,GRAV,0,0,1,0
*DLOAD
EAll,GRAV,-10,0,0,1
*NODE FILE,GLOBAL=YES
U
*EL FILE
S,NOE
*END STEP
8

my input examples above is specific to OpenSees, as in early I mentioned it may look similar but actually different.

your animated pictures shown, no curvature occurs at beam. So, there’s no bending and shear internally were it’s quite strange.

9

They have all three components.

screenshot.268
screenshot.268850×743 81.5 KB

screenshot.267
screenshot.267846×748 77.6 KB

screenshot.269
screenshot.269845×751 74.8 KB

10

The model approach is using *Rigid Body so, the behavior is not the same since it will treat all DOF’s to be dependent.

It seems only generic constraint using *Equation is possible, but it will be cumbersome to do manually. A specific keyword is commonly used by another FE solver, hopefully this feature is available in CalculiX someday.

11

I don’t think so.
None of the beam Dof’s are inside my NSET’s Rigid body definition.

12

i did not look into detail, since it’s too long and hard to copying. only see the output figures you’re shown.

no other element in rigid floor models, only beam and column. could you remove and adds beam element instead?

the purpose of diaphragm are to simplified the models, plate element of slab floor is not included. it represents implicitly by constraint.

13

it seem Abaqus separated the task by two keywords *Coupling type *Kinematic and *Kinematic Coupling and some report successful using the last keywords for many cases.

abaqus_kinematic_coupling
abaqus_kinematic_coupling1014×566 162 KB

2023-08-21 14_30_27-ABAQUS Analysis User's Manual (v6.6)
2023-08-21 14_30_27-ABAQUS Analysis User's Manual (v6.6)1063×565 24.8 KB

14

That’s right but the former (*COUPLING and *KINEMATIC) is currently recommended:

The preferred method of providing a kinematic constraint of this type is the *COUPLING option used in conjunction with the *KINEMATIC option.

Btw. recently a third type of coupling was added in Abaqus - uniform coupling constraint. However, it’s meant for nonmechanical DOFs such as temperature - it imposes their uniformity.

15

indeed, i’m also read about this from Abaqus documentation. However, both types are different, one approach is based on nodes (MPC) another is surfaces based constraint.

In the specific case of Rigid Diaphragm, surfaces based constraint is inappropriate.