MPC, rigid body, coupling, tie

Q1: Is it ok to use MPC-beam/tie to replace rigid body constraints?
A1: Yes. The results are the same.
Q2: Is it ok to use MPC to replace *tie (surface)?
A2: MPC-tie is fine. The result is almost same except a bit more computation time – more increments.
MPC-beam can run but the results are strange. It is not ok.
Q3: Is it ok to use MPC to replace tie and rigid body at the same time.
A3: Yes. No problem.
Q4: Is it ok to add MPC to constraint half of the footing (anchor) Part? So we can extract the reaction force on that half part?
A4: Can not use MPC, over constraints.
Can use coupling but (1) reference point as control point, odb has not output for reference point (in fact RP without used in constraints/boundary will not be counted in the odb).
(2) reference point as being controlled point, odb has output but reaction force is 0.
Q5: Can we move the whole anchor without rigid body constraint? at the time we add MPC Coupling to constrain part of anchor such that we get reaction force:
A5: MPC can calculate but can not give reaction force.
Coupling use reference point as control point gives error.
Coupling use reference point as being controlled point can compute but not reaction force.

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About yhtian

I am an academic researcher working on Offshore Geotechnical Engineering. My blog aims to write down some work related trivial things and tricks about software, programming. It is basically a memo for me to back up some thoughts and small details. But I am more than happy if someone would visit and discuss.
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