RC Elements Design - Appraisals

[Anonymous]

Hi,

I have been asked to appraise a series of columns that are potentially subject to varying load combinations. These columns are recatngular, and would appear to be reinforced unsymetrically. I would like to use Robot for this. 

I have been attempting, to no avail to manually input the main longitudinal bars and stirrups and then back check the section and determine whether sections are OK, or what the restrictive load combination is.

The software seems to get stuck on this page too:>>>>>

Any tips would be great!

Lee

[Artur.Kosakowski]

Could you attach the file with the column with manually distributed reinforcement that you are not able to run verification for please? 

[Anonymous]

Artur,

Please find attached file. I have managed to get the model to restart, and have the following queries:-

• I cannot seem to be able to include horizontal links to the face vertical bars. In UK detailing, these need to be within 150mm of link, however Robot returns a pass and on error on detailing?
• I assume Robot automatically accounts for eccentrities due to imperfections in accordance with BE EN Cl 5.2?

RC Element design module here

Thanks,

Lee

[Artur.Kosakowski]

I'm not sure if you can design your beam in this way as in general the RC Column module doesn't support main bars being defined on part of the column only (perhaps a better option would be to design a beam with axial force included in the calculations).

In general for RC Column design the eccentricities are supported and you can see the values in the calculation note but I'll need to check this particular point. The link bars as a new bars can only be defined in the RC Beam module.

For the RC Column links you may either use the typical reinforcement option and then delete the excessive rebars or allow Robot to generate reinforcement and then edit it. 

For the UK detailing of links (spacing): is it BS or BS EN requirement? 

[Anonymous]

Artur,

Thank you for your reply. I though that using the column design would be suitable, as this produces M-N ineraction diagrams, that are very useful, and could be checked in house as part of our internal auditing. 

I have exported the beam 6 from idealised 3D model as per link. I cannot seem to show the axial loads that are applied in the force diagrams, even though axial loads checked for design?

The design of the shear links seems to be returning odd profile, suggesting that no shear checks have been undertaken.

With reference to the restraining of axial bars, these is found in BS EN 1992-1-1 Cl 6.5.3 ( 6)

3D model link here

( keeps crashing too)

Cheers

Lee

[Refaat]

Dear Lee

Attached are some captures of my attempting with your file. It seems everything safe (beam 6) even with safety factor margin.
I invite you to take a look at them and I recommend you to start your (calculation option & Reinforcement pattern) settings based on (standard) then after that try to modified it until to get safe and economy section.

With Best Regards
Refaat

[Artur.Kosakowski]

Hi Lee, 

I have exported the beam 6 from idealised 3D model as per link. I cannot seem to show the axial loads that are applied in the force diagrams, even though axial loads checked for design?

As far as I can see the axial forces are disregarded because they are set in this way.  

The design of the shear links seems to be returning odd profile, suggesting that no shear checks have been undertaken.

This seems to be caused by spacing generated between 4 leg stirrups generated with the typical reinforcement dialog. If they are defined in the same plane as for standard reinforcement generation they are correctly recognized. 

The solution is shown on the movie below:

With reference to the restraining of axial bars, these is found in BS EN 1992-1-1 Cl 6.5.3 ( 6)

This provisions is currently not supported in RSA. Thank you for indicating this situation. 

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