Hello,
when i try to calculate required reinforcement for slab according to russian code, Robot gives me a warning about SLS combinations, and says, that all loads applied as quasi-permanent. So, what kind of SLS i need to create to avoid this warning? Thank you.
Ignore it.
EC base codes warning message displayed. Not relevant to snip code.
Rafal, I made simple test.
I switched russian codes combinations, and i switched RC elements design according russian standarts. Than I defined a simple slab. I created two load types: DEAD load, and short-term load. I made two different calculations 1. for dead load i defined uniform load 1kN/m2, and for short-term load I defined 40kN/m2. 2. for dead load i defined 40kN/m2, for short-term load I defined 1kN/m2. In both calculations I created automatic combinations for ULS and SLS. After I calculated required reinforcement. For ULS and SLS i used SLS combinations. In both cases I got the same value of stiffness factors. So, as I understood, program doesn't recognize short-term loads and takes into account the creep of concrete for all types of loads. Any comments?
I was promised to get answer for all your snip slab design related questions on Monday.
Necessary to change next coefficient in dialog
For 1 case 40/(40+1)=0.98
For 2 case 1/(40+1)=0.02
is it according to russian code? Seems little bit different. What would you suggest to do, if part of load on slab(load from heavy partitions) is long-term and distributed as uniform-linear load in exact position of the slab, and part of the load(live load) is short-term distributed as uniform load. So, I don't think, that duration factor would be suitable in this situation.
If the loads are same - the coefficient can be calculated in proportion to the value of loads, if the loads are different - then proportional to the maximum moment from each loads.
Proportions for differenet areas(for every finite element) can be absolutely differenet, especially if you have point loads, linear loads, area loads with non-standart slab geometry.
One more thing. I have a super easy slab. I have dead load and live load, I made SLS combination. I designed the slab for required reinforcement(all this according to russian code). I got the warning about SLS combinations and program said that calculations could be not correct(you said i can ignore this warning) After i want to see the crackings. But there are no cracks...why? Please, can you give any comment. I attached this super simple slab. Thank you!
Rafal, can you give more detailed explanation why it doesn't work with analytical method? Is this problem going to be fixed in the nearest future? Our company have a big project in russia, and in the beginning we thought we will be able to design our buildings with RSA. But now it seems to me, program works not properly with russian standarts. At the moment we are thinking about purchasing other programs instead new licenses for Robot.
Is this problem going to be fixed in the nearest future?
Of course.
Already corrected in Service Pack 3 for ARSA 2014
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=22436870&linkID=13140816
Hi Rafal,
You are mentioning the ''duration factor of loads'' coefficient on your third message in ths thread.
Is this factor suppose to be this one mentioned in SNiP as φ1=1+Ml1/M1 ? If yes, is there a reason you are not using the ''1+..'' portion of the equation? Can you please explain?
Regarsd,
Charis
@Rafal.Gaweda wrote:Necessary to change next coefficient in dialog
For 1 case 40/(40+1)=0.98
For 2 case 1/(40+1)=0.02
@Rafal.Gaweda hello. How to set this dialog in English? I was trying many way but it would still display in Russian language.
I am using RSAP version 2020