Hi @Anonymous
I get stuck when dividing the cables. Nodes were created along all cables but during FEA they are shown as isolated nodes. As they are 1D components, how can I divide the cables properly to carry out the FEA?
I think there is no need to divide cables for for model but maybe @Rafacascudo can hive You more hints
I cannot see any numbers of calculation elements at this stage.
Cables are not divided automatically by nodes on them.
If You want to do it, You have to do it manually (Edit \ Divide or Edit \ Intersect)
Rafal Gaweda
That project was done on 2001. By then ,it was done considering the cables as normal bars . That was a valid aproximation as the bars were short and not very inclined (minimum sag).
You can do that with RSA for a preliminary stage to find the cables initial forces .
But for a true and complete Cable stayed bridge analysis you will have to dig further . See what is necessary now for a complete analysis here .
Rafael Medeiros
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Hi @Anonymous
Generally there are 2 ways of defining cables in Robot:
1/ defining them by force i.e. specifying tension (Force Fo) or
prestress (Stress SIGMA) - in such case program will search for
such lengths of each cable that the demanded tensions will be obtained
under assembling loads. After assembling load case for other load cases
these cable lengths are fixed (cables are "clamped").
2/ defining them by length i.e. specifying length (Length L), absolute
or relative elongation (elongation dl) or zero elongation (which
corresponds to nothing in text file). In such case cable lengths are
specified and fixed on the very start of analysis.
In the case 1/ program calculates regulation value as such cable
dilatation that will produce demanded tension under assembling loads for
displaced cable nodes.
In the case 2/ program calculates assembling force as such cable tension
that will be observed when cable ends will be not displaced under
assembling loads.
You may find the attached document helpful.
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Artur Kosakowski
