Bit of an old original post but, I would have thought you could get away with a 203x203UC with small PFC stubs to support the returns.. may need larger if the upper floors span onto the chimney
7/10
7/10
RSJ lintel calculations?
- Thread starter poorandbroke
- Start date
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Static said:
I think if you look at the BSI website, it shows BS449 Part 1, which is the relevant section, is withdrawn although a lot of engineers still use it.
Alternatively you could pay someone suitably qualified to design the beam for you, which you could probably get for about fifty quid if you supply them with a sketch showing what the beam is supporting.
Using rules of thumb to select a steel beam section size given a loading regime and span is not like selecting a timber floor joist from the TRADA tables or the tables that used to be in Approved Document A.
It is not only the loading that should be considred but also the degree of retraint the compression flange of the beam receives.
Where a floor structure completely restrains the compression flange the full bending capacity of the beam may be used. In other circumstances reduced bending capacity is used. Assuming full restraint to a beam where it does not exist is asking for trouble. Unless you are trained accordingly get a suitably qualified engineer to carry out the calculation and provide a detail. There was a paper published in the Structural Engineer journal which suggest degrees of restraint for different restraint conditions so it can be seen that structural engineers will debate what restraint occurs in any given condition
Work of such a nature is likely to be "building work" for the purposes of the Building Act and Building Regulation approval is required. Acheiving this at the time of the work is easier that getting it retrospectively and you are likey to be found out when you sell the property or when the beam you have slected "by eye" fails! I think it is common place for buyers coneyancers to ask if any building work has been carried out on a property.
Hope this helps. A good engineer will earn his fee, there are other issues he or she may be able to put you strainght on for free!
One last thought, would you design a seat belt system to restrain your child in your car?
It is not only the loading that should be considred but also the degree of retraint the compression flange of the beam receives.
Where a floor structure completely restrains the compression flange the full bending capacity of the beam may be used. In other circumstances reduced bending capacity is used. Assuming full restraint to a beam where it does not exist is asking for trouble. Unless you are trained accordingly get a suitably qualified engineer to carry out the calculation and provide a detail. There was a paper published in the Structural Engineer journal which suggest degrees of restraint for different restraint conditions so it can be seen that structural engineers will debate what restraint occurs in any given condition
Work of such a nature is likely to be "building work" for the purposes of the Building Act and Building Regulation approval is required. Acheiving this at the time of the work is easier that getting it retrospectively and you are likey to be found out when you sell the property or when the beam you have slected "by eye" fails! I think it is common place for buyers coneyancers to ask if any building work has been carried out on a property.
Hope this helps. A good engineer will earn his fee, there are other issues he or she may be able to put you strainght on for free!
One last thought, would you design a seat belt system to restrain your child in your car?
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