topic Re: It's possible assign forces to isolated nodes? in Robot Structural Analysis Forum

It's possible assign forces to isolated nodes?

Anonymous — Sat, 18 Mar 2017 00:54:49 GMT

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.

Re: It's possible assign forces to isolated nodes?

Romanich — Sat, 18 Mar 2017 06:30:42 GMT

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

Re: It's possible assign forces to isolated nodes?

Anonymous — Sat, 18 Mar 2017 06:56:55 GMT

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?

Re: It's possible assign forces to isolated nodes?

Romanich — Sat, 18 Mar 2017 07:36:38 GMT

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

Re: It's possible assign forces to isolated nodes?

Anonymous — Sat, 18 Mar 2017 13:56:46 GMT

Thank you Mr Zhelezniak

Re: It's possible assign forces to isolated nodes?

Anonymous — Sat, 18 Mar 2017 14:39:01 GMT

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.

Re: It's possible assign forces to isolated nodes?

Romanich — Sat, 18 Mar 2017 15:33:55 GMT

Try to block UX, UY and UZ directions.

Re: It's possible assign forces to isolated nodes?

Anonymous — Sat, 18 Mar 2017 22:03:46 GMT

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.

Re: It's possible assign forces to isolated nodes?

Rafacascudo — Sat, 18 Mar 2017 22:19:15 GMT

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.

Re: It's possible assign forces to isolated nodes?

Anonymous — Sat, 18 Mar 2017 23:41:45 GMT

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

Re: It's possible assign forces to isolated nodes?

Romanich — Sun, 19 Mar 2017 06:34:06 GMT

Maybe this will help

Re: It's possible assign forces to isolated nodes?

Rafacascudo — Sun, 19 Mar 2017 10:38:54 GMT

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