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Valued Contributor
rioja
Posts: 75
Registered: ‎06-02-2012
Accepted Solution

RC BEAMS - Moments differences between results and RC Design

404 Views, 3 Replies
11-25-2012 08:35 PM

Hi all

1.- My question is how to interpret the following difference between the

The moments from the static analysis results and those for which the beam should be design

please take a look to the attached file

 

 

The complete file is in

https://www.dropbox.com/sh/t791xb9yd91idch/Dy4f96cn6u

 

2.- How to run in order to optimize this structure

in the RC module the reinforcement parameters for optimizing are "open"or without boundaries

however it takes the given section dimensions and fails

 

For your time and advice thanks in advance

 

Marcelo

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Artur.Kosakowski
Posts: 5,046
Registered: ‎12-17-2010

Re: Moments differences between results and RC Design

11-26-2012 02:39 AM in reply to: rioja

1.- My question is how to interpret the following difference between the

The moments from the static analysis results and those for which the beam should be design

please take a look to the attached file

 

I'm not sure if I understand this point correctly. Looking at the parts indicated in green i think that the results are the same: M_after_redistribution at 4.700m = 699.31 and at x=4.711 is is 682.62.

 

 

2.- How to run in order to optimize this structure

in the RC module the reinforcement parameters for optimizing are "open"or without boundaries

however it takes the given section dimensions and fails

 

As far as I can see you have the problem with torsion as it is difficult to manage correct reinforcement distribution for very short spans and cantilevers generated due to the way you modelled and imported the beam 123. I would suggest modelling and designing the beam in the way shown on the attached picture instead.


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Artur Kosakowski
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Valued Contributor
rioja
Posts: 75
Registered: ‎06-02-2012

Re: Moments differences between results and RC Design

11-26-2012 03:53 AM in reply to: rioja

Thanks Artur

for the quick response

 

The point is

in green it seems to be ok the small dif. is only the mouse pointer to be at 4.7m

 

The other values for the other spans

 

in the second picture you can find this legend

 

Highlighted in blue

For P3  My max = 974.92 953.87 kNm

(where 953.87 is from the beam note and 974.92 is from the Results layout)

For P4

My max = -533.21 -395.94 kNm

(where -395.94 is from the beam note and -533.21 is from the Results layout)

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Artur.Kosakowski
Posts: 5,046
Registered: ‎12-17-2010

Re: Moments differences between results and RC Design

11-26-2012 05:02 AM in reply to: rioja

 

Highlighted in blue

For P3  My max = 974.92 953.87 kNm

(where 953.87 is from the beam note and 974.92 is from the Results layout)

 

The accuracy of the import depends on number of points you decide on. In addition I would consider modeling the beam with no vertical offset which influences bending.

 

For P4

My max = -533.21 -395.94 kNm

(where -395.94 is from the beam note and -533.21 is from the Results layout)

 

Values are from the support faces.

Please see: http://forums.autodesk.com/t5/Autodesk-Robot-Structural/RC-BEAMS-Design-of-structure-beam-at-the-col...


 



Artur Kosakowski
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