RC Columns Issue

[luismrf]

I´m designing a small builind and i´m in trouble to design the needed  steels bars, the results i get are a massive steel area, i must have done some mistake when i modeled the builing.

I need help to check my model in RSA please to get credible results, and solve this problem.Please!

Regards,

Luis 

[luismrf]

Hello,

i´m designing a small builing i ´ve already designed the beams, but designing the columns i get massive reinforcement of the columns, (too massive for a builind of these size), i think i might have a problem in my model that is leading to these result, but i don´t know wich problem is it can anyone check my model please and help me get better results.

Thank you,

Luis

[Simau]

@luismrf 

Seismic combinations seem weird to me.
Could you say which reinforcement you get for columns, for example the Columns 40 42 51.
I attache the model with a new set of combinations according to EC2 and the reinforcement obtained for the columns mentioned above

[luismrf]

Hi Simau,

Thank you very much for your help, i´m trying to design the columns for for ULS, and SLS. I´m not using the sismic combinations.

when i use the combination 7 for ULS, i get an acepptable reinforcement, but when i try to design fot both combinations i get a very large reinforcement, and that result is unexpected because i think that the combination 7 is more severe to the structure...so i think i have some error in the SLS combination, but i don´t know what is.

Regards,

Luis.

[Simau]

@luismrf 

I'm not sure I understand your problem.
Here are the model withthe results I get with the combinations 7(ULS) and 8, 9 (SLS).
To compare with your own results. (That i asked for in message 3)

[luismrf]

hello @Simau,

i get results slightly diferent, a bit higher than yours:

i use the required reinforcement maybe this is the reason, what do you think?

Like i said, i get higher rates of steel reinforcement to the SLS 9  combination, than the 7 ULS combination and i think it showld be the other way around...i´m missing something but i don´t know what is..

anyway i need to do some changes, in the spams, i will use c25/30 concrete, i think i will use the 16 mm diameter, and i only want two legs for the transversal reinforcement how can i do that?

This is too much reinforcment!

Thank You!  

[luismrf]

Hello @Simau ,

i dis another model with smaller spans, to get less reinforcement steel and smaller sections, but i still have some problems, in the lower beams i get an error becaus i can´t calculate them, i dont know why: 

 In the columns when i try to calculate them if i do the calculations for the combinations ULS 7 and SLS 9 i get this error, i think i have too much reinforcement to the concrete section:

i get better results when i calculate only yo the comb 7 ULS..

I was trying to design the footing and i have an error that i can´t fix it:

i´m sending you the file, without results, please give an help to solve this issues please.

regards,

Luis

[Simau]

@luismrf 

Like i said, i get higher rates of steel reinforcement to the SLS 9 combination, than the 7 ULS combination and i think it showld be the other way around...i´m missing something but i don´t know what is..

Sorry, but I still don't understand your problem.
You cannot calculate reinforcement with only SLS combinations. ULS combinations  must be present in the selection

[luismrf]

Hello @Simau ,

the problem is: 

when i use ULS and SLS combination i get this results for the coulumns:

when i use ULS only:

is this ok? 

regards,

Luis