Switch floor structure with steel beam

[bossespecial]

The first thing you need to do is identify which loads are acting on the floor slab.

 

[daugaard]

Option 4: how does the possibility look to shift onto the attic instead and relieve the load-bearing wall. there might be minimal impact on the surface layers then. perhaps a glulam beam can fit there if you prefer that.

 

[justusandersson]

As I pointed out earlier: We who are following this thread have not been given a chance to see the problem in a larger context. So, bring out the drawings, or shut down the thread.

 

[Karl_Pedal]

As I pointed out earlier: We who follow this thread haven't had a chance to see the problem in a larger context. So, bring out the drawings, or end the thread.

Here's how it looks on the k-drawing. The problem area is around the thin dashed horizontal line. There is no possibility for relief in the attic, etc., so the focus is on floor actions.

 

[Karl_Pedal]

Option 4: how does the possibility look to shift off in the attic instead and relieve the load-bearing wall. There might be minimal impact on the surface layers then. there maybe a glulam beam can fit if you prefer that.

Unfortunately, there is no attic.

 

[justusandersson]

What is the span of the 45x220 bjälkarna?

 

[bossespecial]

You should probably attach the entire drawing (it looks cropped), as well as sections and any other drawings you have. Part of the problem could be due to the nearly 5m (if the studs are drawn at cc600) long IPE200 beam which also seems to rest on a load transfer. What is the dashed "corner" under 2 PCS "45x220"?

 

[Karl_Pedal]

What is the span of the 45x220 beams?

4.2 meters

 

[Karl_Pedal]

You should probably attach the entire drawing (looks cropped), and any sections and other drawings you have. Part of the problem could be due to the nearly 5m (if the studs are drawn cc600) long IPE200 beam which also seems to rest on a support. What is the dashed "corner" under 2 ST "45x220"

The steel beam is resting on a load-bearing interior wall as well as on an exterior wall. There are no deflection problems with the steel beam, so the problem is only limited to the area depicted in the drawing. The dashed corner is the upper floor's exterior walls, which appear as shown in the image below.

 

[bossespecial]

Where is the load-bearing wall that stands on the floor structure? Don't you have any blueprints?

 

[Karl_Pedal]

Where is the load-bearing wall on the joist? Do you have any plans?

Not easily accessible, no. I think the context is clear from the drawing + illustration. The problem is that it's not feasible to tear up the floor to reinforce the joist, and there are no other alternatives than to do it from below. I find it hard to see that more detailed plans would be needed to describe the isolated problem.

 

[Stefan1972]

Why not just let it be? Feels like it's an incredible amount of work for an aesthetic thing.

 

[Kaboff]

Are masonitbeams included, https://www.masonitebeams.se/konstruktion-och-montage/spaennviddstabeller-och-kapaciteter/

 

[bossespecial]

You mentioned in your first post that the roof is bearing on the joist. Therefore, it is good to see how the roof's load is distributed and how much is affecting the joist. The first step is to figure out how and why the problem occurred. Once this is done, one can determine what is needed to fix the issue. It was not clear in your first post, but on which side of the joist is the deflection problematic, above, below, or both?

 

[justusandersson]

I still have difficulty orienting myself. An exterior photo plus some general information about the construction year, construction method, etc., would help. 45x220 c/c 600 span 4.2 m (if they correspond to C 24) gives a deflection of L/300 with normal distributed load. If interior walls, etc., are added, it's not enough, but as bossespecial writes, it's impossible to determine what reinforcement is needed if you can't calculate the additional loads.