Calculate Beam

[Byggare och renoverare]

Do you have it in writing from the person who is supposed to approve the installation? If not, you probably have to reinstall the oven..

Yes, the concerned persons and authorities are probably informed so it's nothing you need to worry about at all, this still has nothing to do with the calculation of the beam...

 

[hlph]

It's no more difficult than calculating the maximum bending stress as the maximum moment divided by the section modulus. In this case, it becomes M=2500*900 Nmm and the section modulus around Z =13800mm3 (table value), resulting in a maximum stress of 163 MPa. If it's a 235 material, then the safety margin is a bit too low. For lifting beams, one would want a factor of two against plastic deformation. I wouldn't lift using that beam. If you instead bend around Y, the stresses in the beam aren't a problem, but you should calculate the buckling. I don't do that regularly, so I'm not sure how to quickly do it.

 

[fribygg]

Yes, the concerned individuals and authorities are probably notified, so it's nothing you need to worry about at all, this still has nothing to do with the calculation of the beam...

So you don't have it in writing, if I understand you correctly?

 

[Kane]

Over the z axis, thinking it will be unstable otherwise or do you have a different opinion?

Now, I don't have my old formula collections nearby, but it seems to be a 5 mm deflection if it's positioned that way. So it should be OK.

 

[Byggare och renoverare]

So you don't have it in writing if I understand you correctly?

It's in writing via email if that eases your concern, would you like me to send it to you for review? It's in Finnish though...

 

[Byggare och renoverare]

Now I don't have my old formula collections nearby, but it seems to be a 5 mm deflection if it's positioned that way. So it should be OK.

Thank you very much for a sensible answer, seems to be difficult on this forum these days.

 

[fribygg]

Written confirmation is available via email if that eases your concern, do you want me to send it to you for review? It is in Finnish though...

If the lift and relocation are to take place in Finland, I don't know what regulations apply. Here in Sweden, you definitely have to reposition the stove and let the chimney sweep pressure test and approve the installation before you can use it after moving it.

 

[zbynio]

Lifting, moving, and repairing houses during the day, so the lifting isn't a problem. I turned to this forum to get a calculation on a beam I already have and want to lift/hang 500kg in the middle of 2m, i.e., 1m. Old man's guesses and ridicule are not appreciated.

Thank you so much for a sensible answer, seems difficult on this forum these days.

Always hard to get the answer one wants I still maintain that if it's not S355 steel quality in your beam, you might run into problems. But maybe it can be braced with something else...

 

[hlph]

Now I don't have my old formula collections nearby, but it seems to be a 5 mm deflection if it is placed that way. So it should be OK.

If it is a beam that is used temporarily for something like a lift, deflection is a criterion that is particularly important, unless the deformation is so large that it causes other negative effects. The most important thing is that we do not have a collapse of the cross-section, and the first requirement is that we have good safety against plastic deformation. But for many cross-sections, there are also stability requirements that need to be checked. So I would not have used the beam that way. I don't think one should compromise on the safety factor, there are certainly uncertainties of buckling.

 

[Byggare och renoverare]

If the lifting and moving are to be done in Finland, I don't know what regulations apply. Here in Sweden, you definitely have to reset the stove and have the chimney sweep pressure test and approve the installation before you start using it after moving it.

Yes, I can imagine. Where can one find a source for the regulations stating that you must reset the stove after moving in Sweden? Have you specifically asked this question to the authorities? I would like to see it in writing.

 

[fribygg]

Yes, I can imagine that. Where can one find the source for the rules that require you to reset the oven after moving it in Sweden? Have you specifically asked the authorities that question? I'd like to see it in writing.

You'll probably need to check with Boverket what rules apply for newly installed old fireplaces, I don't know what applies to your oven and if it will even be approved for use.

 

[Byggare och renoverare]

Always hard to get the answer you want I still maintain that if it's not S355 steel quality in your beam, you may have problems. But maybe it can be braced with something else...

I have no problem getting a negative answer, but I want people to stick to the topic. I can try to check the quality of the beam, might be able to find that out with a little research.

 

[Byggare och renoverare]

You should probably check with the National Board of Housing, Building and Planning for the rules that apply to newly installed old fireplaces. I don't know what applies to your oven and whether it will be approved for use at all.

So you were just guessing then about my oven

 

[fribygg]

Have you specifically asked that question to the authorities?

I don't understand what you mean.

 

[fribygg]

So you were just making an educated guess about my oven then

Check boverket