EC2 Error

[albertopola]

Hi everyone,

I'm trying to understand this error about wrong positions of the stirrups in a beam, who can help me, please?

bye

[Artur.Kosakowski]

Have you compared the arrangement of the stirrups with the code provisions?

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.

[albertopola]

Hi Artur,

I do it many times, but I think the problems is on "cut-off" column as in 2nd poit of the paragraph 5.4.3.2.1. ARSA considers the doubbling of the critical zone??

[Artur.Kosakowski]

This provision is supported. Could you attach the rtd file and indicate the beam to look at please? I'll try to find out what causes the display of the message.

[albertopola]

Hi Artur,

Thank you very much, I resolved the problem about beams and now I have the problem in columns, (see attached). The problem is that I don't know where I can see this provisions verifications, in Calculation Note I don't find them, are they in the ralation template?

And where can I find the hierarchy of strength of the columns? How can I modify gamma,rd in node calculation

[Artur.Kosakowski · Accepted solution]

Ad1:  5.4.3.2.2(12)P – Robot uses provisiond of EN1992-1-1:2004 which is allowed for 0.2<q<2.0

Ad2:

5.4.1.2.2 Columns (EN 1998-1:2004)

(1) Unless q<=0,1 (see 4.4.2.2(2)), the cross-sectional dimensions of primary

seismic columns should not be smaller than one tenth of the larger distance between the

point of contraflexure and the ends of the column, for bending within a plane parallel to

the column dimension considered.

4.4.2.2 – znajdziemy w EN 1998-1:2004

The linear analysis can be used for q <= 0,1

Ad3:

5.4.3.2.2 Detailing of primary seismic columns for local ductility

(4) In the absence of more precise information, the length of the critical region lcr (in

metres) may be computed from the following expression:

lcr = max{hc ; lcl / 6; 0,45}(5.14)

where

hc is the largest cross-sectional dimension of the column (in metres); and

lcl is the clear length of the column (in metres).

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.

[albertopola]

Thank You very very much, as usual you're very precious solving our doubts and you confirm me what I supposed.

Bye

[Tuctas]

 Just a comment to Artur's answer.

 Ad1:  5.4.3.2.2(12)P – Robot uses provisiond of EN1992-1-1:2004 which is allowed for 0.2<q<2.0

 
The above condition is not 0.2<q<2.0, but both: νd<0.20 and q<2.0 instead (where νd is the normalized axial load). Besides, 0.2<q can't be true (it is always q>1.0...). Since these two conditions concern a limited number of cases (what about q>2.0..?), i hope that Robot will improve this implementation.

 Ad2:

 5.4.1.2.2 Columns (EN 1998-1:2004)

 (1) Unless q<=0,1 (see 4.4.2.2(2)), the cross-sectional dimensions of primary seismic columns should not be smaller than one tenth of the larger distance between the point of contraflexure and the ends of the column, for bending within a plane parallel to the column dimension considered.

 4.4.2.2 – znajdziemy w EN 1998-1:2004

 The linear analysis can be used for q <= 0,1

This paragraph uses the term θ instead of q. So it says: Unless θ<0.1...". As far as i know Robot doesn't calculate θ.. (this would be very convenient..) so how this provision can be properly used in Robot?

[Artur.Kosakowski]

 Ad2:

This paragraph uses the term θ instead of q. So it says: Unless θ<0.1...". As far as i know Robot doesn't calculate θ.. (this would be very convenient..) so how this provision can be properly used in Robot?

Robot assumes that θ<0.1 

[Tuctas]

 O.k but the specific provision concerns the cases that θ>0.1 (it says "Unless θ<0.1..."), so there is an "incopatibility" between what Robot assumes and calculates and what the code requires...

 Anyway, it will be very helpfull if the value of θ was automatically calculated, not only for the specific provision. I have made a proposal for this option to be implemented in Robot many times in the past, i hope some day will be done... (I have also added in the wishlist about a very similar value that is used in EC3: Alpha_cr coefficient (αcr) according to EC3 (chapter 5.2) ).