RSJ Size?

[Allmech]

I want to put my millling machine into the top  of a split level barn, but this involves changing some of the exsisting oak beams for some steel. I have looked at and priced 200x90 IPN section steel which is ok , but I am unsure of  if it take the weight safely. The span between the walls is 3m and the mill is estimated at 1250kg placed in the centre on two IPN steels. I spoke to the steel supplier and tried internet search etc to no avail, it is not an easy thing to work out. I can but dont want to put some posts in the middle to surport from the floor. The mill along with lathe and pillar drill has spent the last 3 years in the bottom of the barn but it is so damp the rust is really big problem. The lathe a Colchester Mascot 1600 2000kg is also going up but one end will be over  a supporting wall so the mill is the heaviest  in the unsurported span.

I seem to think it shouldnt be a problem as the car and motorbikes etc already stored in the barn on oak poutres with larger span

 

Maybe someone might know what is possible?

[La Guerriere]

IPN200 Section modulus is 214 cm3.

Assumed simply supported beams each taking 1250kg = 625 kg per beam = 6130 N per beam at midpoint. Max bending moment = 6130 * 300 / 4 N.cm = 459750 N.cm

Bending stress at midpoint = 459750 / 214 N / cm2 = 2148 N / cm2 = 21.48 N / mm2 = less than 10% of yield, you are OK by my reckoning. If it was a bit heavier there might be deflection issues but at this sort of stress level you should be OK.