It's possible assign forces to isolated nodes?

[Anonymous]

Hi, I want assign forces to isolated node but when I run the analysis the forces don't act in others RC elements on story.

I want make a seismic analysis by FHE(Force Horizontal Equivalent) method manually. By this reason I just assign the unique forces to a isolated node, whatever, this node in each story od the structure is the mass center.

Any idea is important for me,  thanks.

[Romanich]

You have to connect this node with other nodes using rigid links.

[Anonymous]

Right but if I do it,  that rigid links must be RC elements like beams? and further if I put rigid link to conect it, the stiffness of story change. Then How I can solve it?

[Romanich · Accepted solution]

Try to use Geometry - Additional Attributes  - Rigid Links dialog.

[Anonymous]

Thank you Mr Zhelezniak

[Anonymous]

I do it and now I have a question, this diaphragm must be blocked in UX, UY and UZ directions or UX and UY only? Because when I defined it blocked in UX nad UY, I have inestability of type 1 on nodes.

[Romanich]

Try to block UX, UY and UZ directions.

[Anonymous]

How can I show tables with displacements for envelope values only for the MAX and MIN value in each node?

In the below image we can see a table for envelope value for each node (white color cell) but further there is other values that are not the biggest or smallest in the node (gray colour cell).

Then I just want to obtain a table with  white cells values.

[Rafacascudo]

The 》and《 symbols are max and min values and the other values of that same line are the cocomitants of when that max or min occur.

[Anonymous]

That's right but how can I a table with this max and min values just them?

[Romanich]

Maybe this will help

Or

[Rafacascudo]

Don't exacly know what you are aiming but ,

1- try the "global extremes" tab down below

Or

2- on the envelopes tab , right click , choose "table columms" and select only the displacement/rotation direction you want to show