Rigid links - two master nodes connected to the same slave node

[skellyRSA2023]

Hi,

i was wondering could somebody help me. Can i have a rigid link master node connected to slave nodes at the top of a wall using a rigid (which i am applying a horizontal load to the master node) and then have a second master node connected to the same slave nodes on the top of the wall using a rigid link i.e. Can slaves nodes be associated with two different master nodes? 

The reason i ask is that i want to apply two different point load cases to the master nodes in the same model but rsa wont let me? I.e. Say i have a wind load case and notional load case which act on the same walls but at the different locations? I.e. Two separate master nodes connected to the same slave nodes?

Help or comments on this would be appreciated. 

Thanks,

Simon. 

[Romanich]

Hi @skellyRSA2023 ,

Unfortunately, it is not possible.

[Rafacascudo]

Not sure of what you need to do . A sketch or a picture of your model would help. But if it is not possible to do it with rigid links , then you can try using ultra rigid weightless bars instead ,to simulate the rigid links

[skellyRSA2023]

Rafa,

See attached pdf to give you an idea of what I am trying to do. I would be trying node 183 as a masternode to the nodes on the tops of the walls as a slave node so as to distribute the horizontal point load applied into the walls based on there stiffness which theres no issue doing this. However I would also like to use node 184 as a masternode connected to the nodes on the tops of the walls also, so as these act as slave node and apply a separate load case to node 184 and see how much is distributed into the walls? However Robot doesn't seem to let me connect two masternodes to the same slave nodes?

Thus it is difficult to have different loads analysed in the same model? i.e. same wind and notional loads which act on stability cores at different locations as an example.

Simon.

[Rafacascudo]

Use rigid links for one node and ultra rigid bars for the other one.

Test if your rigid bars are acting as expected .Use bar releases to simulate your free rigid links direction.

Compare results between model with Rlinks and same model with rigid bars to check if results are the same.

Also test making one of the two nodes also a slave node.

Your master nodes don´t need to be a support

[skellyRSA2023]

Rafa,

thanks for gettng back. When you say ultra rigid bar are you refering to a superbar? I have of superbars but never used them or are you talking about a normal general bar and making it extremely rigid and stiff? Would you have an example of this ultra rigid bar? 

Simon. 

[Rafacascudo · Accepted solution]

regular general bar with very high properties or/and very large E ( Young modulus)