Welding acc. to Eurocode

[Ignicolist]

Hi everyone!

I´m trying to calculate an easy welding Connection between two plates according to the Eurocode. However, I have some questions about the process.
Enclosed is the file (.pdf) with the calculation. This is a very easy example. It would be very nice is someone could take a look to it and tell me if everythings seems to be ok.
(all the Units are N and mm).

In addition, I would also like to make the same calculation but considering the fatigue and assuming that the load goes always from 0 to the maximum value.
The target cycles are 100.000.

As far as I understand, I have to go to the Figure 9.6.1, choose the right Detail category and the number of cycles and use this value as a limit for the calculated stress?

Thanks in advance

Best regards!

 

[XL83NL]

Which Eurocode?

 

[Ignicolist]

Eurocode 3.
However if any additional Standard helps to calculate welding, it is not a Problem to use it. I used the Eurocode because is the Standard that I have right now.

 

[kingnero]

If target is 100k cycles, you do not need to take fatique into consideration.
By the way, ENV (what you use) aren't the eurocodes. Not that there is a huge difference, though. But they aren't.

 

[Ignicolist]

Thank you for the Information.
ENV seems to be a Kind of pre-standard. As I´m doing a first approach to this calculation I guess this will be ok. Later can I go more in detail.

If target is 100k cycles, you do not need to take fatique into consideration.
Which would be then the Limit to consider the fatigue?
According to the Information shown on the graphics (see the enclosed .pdf), up to 10.000 cycles, there is a reduction of the strenght of the welding due to the fatigue...

 

[kingnero]

I generally only start to worry from 1.000.000 cycles.
See EN 1993-1-9. You are correct though, the graph starts at 1E4 cycles.

If you are serious about this, I'd suggest a full pen weld as it will tremendously improve your fatigue strength.
See also the various schematics of weld details that are summed up in table B1 of EC 3-1-9