Robot Structural Analysis

## Robot Structural Analysis

Contributor
Posts: 16
Registered: ‎07-28-2011
Message 1 of 4 (238 Views)

# Connection problem: column base design

238 Views, 3 Replies
01-20-2012 03:46 AM

I'm facing an issue with the following setup:

node 1: 0,0 (support type: fixed)

node 2: 0,2000

node 3: 2000,2000

bar 1: column from node 1 to node 2

bar 2: bracing from node 1 to node 3

the rest of the construction is not meaningful for this issue.

After doing the FEM analysis I want do to a connection column base design. When doing this design the connection is designed for the bar forces from bar 1 (column) only. The forces from bar 2 (bracing), which, in practice, need to be guided trhough the base plate of the column to the concrete, are not included in this calculation.

This seems logical as both bar 1 and bar 2 end directly in a fixed support and thus the forces from bar 2 will never work on bar 1 and thus not on the connection.

I can solve this by adding an extra node 4: 10,0 and let bar 2 going from node 4 to node 3, so that the force from the bracing will affect bar 1 (column). However, my design has centerlines running exactly to node 1.

So if I make my centerline model correct, the connection forces are wrong. If I make the model such that the connection forces are correct, the centerlines are not correct and I need extra nodes.

What is the best solution for such an issue?

Secondly, I have modelled the connections in the beginning of the project. After that I ran the analysis and the connection calculations. Then an update on forces was done, so a recalculation was needed. I ran the analysis and re-ran the connections. I expected Robot to auto-update the forces in the connections calculations after the analysis was re-ran. Apperently this doesn't happen and I have to update the connections and then re-run them to get correct forces in the calculations. Is this how it should be done?

Product Support
Posts: 3,619
Registered: ‎12-17-2010
Message 2 of 4 (236 Views)

# Re: Connection problem: column base design

01-20-2012 04:00 AM in reply to: corne_mo

What is the version of Robot that you use please?

Artur Kosakowski
Contributor
Posts: 16
Registered: ‎07-28-2011
Message 3 of 4 (232 Views)

# Re: Connection problem: column base design

01-20-2012 04:25 AM in reply to: Artur.Kosakowski

Robot Structural Analysis Professional 2011 (24.0.6.3598).

Product Support
Posts: 3,619
Registered: ‎12-17-2010
Message 4 of 4 (224 Views)

# Re: Connection problem: column base design

01-20-2012 05:38 AM in reply to: corne_mo

It's time to upgrade to v.2012

You can update the forces by  pressing the indicated button:

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Artur Kosakowski

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