Automatic Combinations to BS-EN 1990:2002 NA:2004

[Anonymous]

Hi, I wonder if there is a way of geting this thing done correctly or it's just me.

I have created generic model with following load cases:

1 DL1 DL1 Structural Static - Linear
2 LL1 LL1 Category A Static - Linear
3 LL2 LL2 Category H Static - Linear
4 SN2 SN2 Snow H<1000 m above sea level Static - Linear
5 WIND1 WIND1 wind Static - Linear

So from above:

LL1 Category A: domestic, residential areas acc. to BS EN 1991-1-1:2002

LL2 Category H: roofs acc. to BS EN 1991-1-1:2002

There is note regarding roof loads in EN 1991-1-1: Clause 3.3.2 (1)

3.3.2 Additional provisions for buildings

(1) On roofs, imposed loads, and snow loads or wind actions should not be applied

together simultaneously.

Above would mean that LL2 should not be combined with snow or wind loads, but using automatic combinations gives us the following:

6 (C) ULS/1=1*1.35 + 2*1.50 + 3*1.05 + 5*0.90 + 4*0.75

7 (C) ULS/2=1*1.35 + 2*1.50 + 3*1.05 + 5*0.90

8 (C) ULS/3=1*1.35 + 2*1.50 + 3*1.05 + 4*0.75

9 (C) ULS/4=1*1.35 + 2*1.50 + 3*1.05  

10 (C) ULS/5=1*1.35 + 2*1.50 + 5*0.90 + 4*0.75

11 (C) ULS/6=1*1.35 + 2*1.50 + 5*0.90  

12 (C) ULS/7=1*1.35 + 2*1.50 + 4*0.75  

13 (C) ULS/8=1*1.35 + 2*1.50  

14 (C) ULS/9=1*1.35    

It would be nice if you define load types properly asigning load category that Robot would combine them acording to code requirements.

Rokas

[StefanoPasquini6790 · Accepted solution]

Hi Rokas,

My suggestion is to explode the automatic combinations and delete manually the wrong ones. Many years ago I've downloaded and installed a fantastic API called combiner for robot....this can help you for automatic combination.

Greetings.

[Rafal.Gaweda · Accepted solution]

or you have to modify regulations \ regulation file