Simple way to get total force transferred from walls to diaphragms (RSA) 1

ggcdn · Jan 6, 2023

Anyone know of a simple way to get the total force transferred between walls and diaphragms when utilizing response spectrum analysis?

If it were static or time history, I could subtract the shear in the walls above/below the diaphragm. But in response spectrum analysis this isn't quite correct. I would have to extract the shear from each mode, and do the modal combination outside of ETABS, which is doable, but kind of tedious.

-JA
try [link calcs.app]Calcs.app[/url] and let me know what you think

rscassar · Jan 6, 2023

Section cuts are good. I like to assign section cuts thru groups. Where you selected the area objects and the nodes where u want the section cut to be used. The other way would be to get the nodal forces for each area object, this will derive the same result as the section cuts.

ggcdn · Jan 9, 2023

Thanks rscassar, I’ve been using section cuts for internal forces elsewhere in the diaphragm but was hoping to use a more automated method. I think I will just extract the modal pier forces and recombine in a spreadsheet.

-JA
try [link calcs.app]Calcs.app[/url] and let me know what you think

Trenno · Jan 9, 2023

How about the step in the shear force diagram for the wall pier is equal to the diaphragm shear being delivered at that level?

ggcdn · Jan 9, 2023

Trenno, that method is exactly what I wish I could do - it's great for static cases. For response spectrum cases its not going to be correct, since you are using forces which have already undergone modal combination and are not necessarily in equilibrium.

-JA
try [link calcs.app]Calcs.app[/url] and let me know what you think

sticksandtriangles · Jan 9, 2023

JA,

You could try using this code make a lot of slices through your diaphragm with the section cut tool.

https://re-tug.com/post/diaphragm-slicer-etabs-api/8

Hopefully eliminates the tedious nature of section cuts.

S&T -

http://www.re-tug.com

rscassar · Jan 10, 2023

That's a good looking website, nice scripts as well.

ggcdn · Jan 11, 2023

thanks S&T, I've come across your script before and have been meaning to try it out. It would be a fun project to try and make a plugin out of it.

-JA
try [link calcs.app]Calcs.app[/url] and let me know what you think

sticksandtriangles · Jan 11, 2023

ggcdn said:
It would be a fun project to try and make a plugin out of it.

That's a good idea JA, I have not dived into making a plugin yet in ETABs, but it is on my to-do list.

I have seen your github on the starter kit...

https://github.com/jchatkinson/ETABS-plugin-starter-kit

I will dig in the future. Would be a fun collab.

S&T -

http://www.re-tug.com

steelnz2003 · Apr 6, 2023

How to apply the escipt in Etab please
I try to add it under tools it only shows plugin

sticksandtriangles · Apr 6, 2023

steelnz, I assume you are trying to use the C# diaphragm slicer?

Reach out to me on the site and I will send you a .dll file for use.

S&T -

http://www.re-tug.com

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