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Posted by crea on July 24, 2009, 12:16 pm
PeterD wrote:
>> Just interested to know what kind of materia for big buildings main
>> columns is safe/safest. I read a surprising article saying that
>> using (thick) timber is good. It is known that steel structure does
>> not hold if there is bigger fire: There is a risk of building
>> collapsing (say after 6 hours fire) because steel loses its
>> strength. I wonder why are they using so much steel because of this
>> risk (according to history steel can give up strength too much even
>> after 1-2 hours fire)... Timber with some kind of coating best?
>> thanks
> define 'safest'... There are many more hazards than fire. If you can
ok, lets leave it to fire only to keep it simple
> coat wood to protect from a six hour file (or a two hour fire) then
> you could coat steel as well.
i dont think coating steel helps much because the problem is not that it
gets melted but that it gets weakened and then bents
> define 'big buildings'... 5 floors? 20 floors? 100 floors? How many sq
say 40-80 floors
> metres? 100? 1000? 10,000?
well, say average size for tall buildings
> define 'thick timber'... 12" x 12"? 24" x 24"?
the designer can deside keeping in mind the costs, usefulness etc. , but
lets say that about the same size what would be with steel is steel used.
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>is safe/safest. I read a surprising article saying that using (thick) timber
>is good. It is known that steel structure does not hold if there is bigger
>fire: There is a risk of building collapsing (say after 6 hours fire)
>because steel loses its strength. I wonder why are they using so much steel
>because of this risk (according to history steel can give up strength too
>much even after 1-2 hours fire)... Timber with some kind of coating best?
>thanks