Wind Load EC1 EN-1991-1-4

[dimogrec]

Hi,

Am I right that Robot does not calculate wind load on canopy roofs (stucture with complete opened sides, only roof) as defined in EN 1991-1-4 part 7.3 (tables 7.6 and 7.7)?

[Artur.Kosakowski]

Yes, you are right.

[dimogrec]

Thanks for the confirmation Artur

It comes out from the top of this page  "The load is generated for typical workshop structures..." 

1)In the same page for the Cpe coefficient I read these:
"Vertical walls of buildings, Cpe according to table 7.4"        => shouldn't it be table 7.1?

"Flat roofs, Cpe according to table 7.6"                                    => shouldn't it be table 7.2 (and figure 7.6)?

"Monopitch roofs, Cpe according to table 7.7"                        => shouldn't it be table 7.3a & 7.3b (and figure 7.7)?

"Duopitch roofs, Cpe according to table 7.8"                           => shouldn't it be table 7.4a & 7.4b (and figure 7.8)?

Multispan is correct 

2)In the same page for the Cpi coefficient I read:

"The internal pressure coefficient is used, by default, according to 10.2.9 (6) as extreme values: "Cpi = 0,8 pressure (+) case   Cpi =-0,5 pressure (-) case"  

what/where is 10.2.9 (6) ? any reference?

3) So the option of openings-permeability in wind load parameters is limited. According to EN 1991-1-4  7.2.9 (2) "....When in at least two sides of the buildings (facades or roof) the total area of openings in each side is more than 30 % of the area of that side, the actions on the structure should not be calculated from the rules given in this section but the rules of 7.3 and 7.4 should instead be used." and since 7.3 (and I suppose also 7.4) aren't covered by Robot, I cannot  have a situation like in the attached picture.

It would be right to get a warning from robot when I exceed the allowed number of sides with "large" openings or at least add a clear comment to this page    

[dimogrec]

Could someone please answer the question 2) and confirm 3)?

ps: I did not accept as solution the answer of Artur, I don't know why it looks so. I still have some questions-clarifications about wind load

[Ilona.Michalska]

Hi dimogrec,

Regarding the first and second point from your previous post...
I just wanted to let you know that this topic was updated and you can find some help here:
http://help.autodesk.com/view/RSAPRO/2015/ENU/?guid=GUID-4500C015-BC0A-4605-904C-AF3CA79EDD16.

Thank you so much for your remarks. This is much appreciated.

[dimogrec]

Nice! thanks.

[Artur.Kosakowski]

ps: I did not accept as solution the answer of Artur, I don't know why it looks so. I still have some questions-clarifications about wind load

I have removed this mark.