Strength of beam 220x4.5

[Luddes1]

How many kilos of pressure can 3 joists of 220x4.5 with a length of 4 m withstand?

 

[tobbbias]

Those were some skinny bastards you got a hold of...

Joking aside. How are they loaded? Are they supposed to be columns/posts between two floors?

 

[justusandersson]

A 45x220 mm C 24 joist with a 4-meter span that is loaded with a point load of 450 kg in the middle will deflect approximately 13 mm, which is 1/300 of the span, commonly used as a limit in many contexts. This applies under the condition that it is a temporary load. For long-term loads, other conditions apply. Three joists give the same result for a load three times as large if it is evenly distributed.

 

[Herr_Per]

Regarding the headline: Strength and not property

 

[Luddes1]

Those are some skinny guys you got hold of...

Joking aside. How are they loaded? Are they meant to be columns/posts between two floors?

Hello, the wall underneath is to be removed and there is concrete tile on the roof.

 

[Luddes1]

Those are some narrow bastards you've got your hands on...

Joking aside. How are they loaded? Are they to be columns/posts between two floors?

Hi, there are four roof trusses that need to be hung. The opening is 4m where it is load-bearing on both sides, sending a picture

 

[tobbbias]

In that case, Justus's answer above applies. Temporary 450 kg point load in the middle per beam is ok.