## Robot Structural Analysis

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic to the Top
- Bookmark
- Subscribe
- Printer Friendly Page

# Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

Good morning,

I'm posting this to ask several things related with "RC Design"->"RC Members -> Required Reinforcement".

By default you can have required reinforcement along b and h, this is valid for rectangular/square sections, how can have required reinforcement to circular columns?

When defining R/C member type i've selected nominal curvature to second order analysis...i tried help to get more information but it says page not found...what is happening?

How can i see detailed calculations related to second order analysis...displacements, slenderness and other parameters defined on point 5.8.8 of Eurocode 2 (EN 1992-1-1)?

Thanks in advance.

Solved! Go to Solution.

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

By default you can have required reinforcement along b and h, this is valid for rectangular/square sections, how can have required reinforcement to circular columns?

http://docs.autodesk.com/RSA/2013/ENU/filesROBOT/G

UID-84324591-17D9-460E-AF1E-DBD2AF363F8C.htm

When defining R/C member type i've selected nominal curvature to second order analysis...i tried help to get more information but it says page not found...what is happening?

The method follows point 5.8.8 of EC2.

How can i see detailed calculations related to second order analysis...displacements, slenderness and other parameters defined on point 5.8.8 of Eurocode 2 (EN 1992-1-1)?

The detailed calculation note is generated by the RC Column design module only. The RC member required reinforcement does not create it.

*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**

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

*The detailed calculation note is generated by the RC Column design module only. The RC member required reinforcement does not create it. *

* *

Ok, i experimented that. Is there a way to see the values in table shape or just as calculation note?

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

This kind of result is available in the note only.

**Artur Kosakowski**

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

Hi again Artur,

I was trying to understand better RC Design looking the values i was talking. But i've some bug on calculation note...

What i'm making:

1. After defining R/C member type i select bar 4 (example)

2. Design -> Provided Reinforcement of RC elements

3. Manual Combinations -> I select just Case 35 (__here i don´t understand why othe combinations doesn´t appear, per example combination 26__)

4. Select column 4 -> Run calculations

5. I got the warning that column is in tension __(that's not possible to combination 35)__

6. Looking to "column - note" i see load cases that i haven't selected (case 24/25/26)

7. On point 2.5.1 i see that force are multiplied by -1!? Saying also Conditioning Combination (i don't know if this is text on english version): -1.0026 (A)....__what is this?__

__ __

Model in attachement.

Thanks again

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

In addition to selected combination 35 Robot imported also combinations 24, 25 and 26. Please delete them from the load table in the RC Column module before running design of the column.

*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**

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

I cannot see that table...where can i find it?

How about what i refer on point 3: "Manual Combinations -> I select just Case 35 (here **i don´t understand why other combinations doesn´t appear**, per example combination 26)"

Thanks

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

I cannot see that table...where can i find it?

How about what i refer on point 3: "Manual Combinations -> I select just Case 35 (herei don´t understand why other combinations doesn´t appear, per example combination 26)"

This is currently under investigation but as I wrote they can be easily deleted from the load table of the RC Column module instead.

**Artur Kosakowski**

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

Ok, i already found it.

Regarding point 7: 7. *"On point 2.5.1 i see that force are multiplied by -1!? Saying also Conditioning Combination (i don't know if this is text on english version): -1.0026 (A)....*__what is this?"__

__ __

I see that robot makes this when load combinations are defined in "nature of case" as seismic...why?

I have other possibilities to nature of case:

- structural (that seems ok)

- non-structural

- category A

(...)

- category H

If nature of case influence column analysis...what is the effect on design for each one of this categories?

P.S.: i kow that category A to cat. H refers to live loads categories on EC2

# Re: Rc Members - Required Reinforcement - Circular columns

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report Inappropriate Content

Regarding point 7: 7. "On point 2.5.1 i see that force are multiplied by -1!? Saying also Conditioning Combination (i don't know if this is text on english version): -1.0026 (A)....what is this?"

Combination 26 * -1 at the top of the column (point A)

I see that robot makes this when load combinations are defined in "nature of case" as seismic...why?

In general when you define seismic case you usually define it assuming that the excitation is in the positive direction of X or Y but of course in reality it can be in the opposite directions too. This is why they are duplicated and half of them gets -1 factors.

I have other possibilities to nature of case:

- structural (that seems ok)

- non-structural

- category A

(...)

- category H

If nature of case influence column analysis...what is the effect on design for each one of this categories?

They have no influence on the RC Column design.

**Artur Kosakowski**