Strength of concrete hollow blocks?

[hertzbo]

Can a 25cm wide old concrete block withstand point loads of up to 9.0kN/m (self-load + snow)?

 

[fahlis]

What do you mean? Your question contains a contradiction.

A point load of 9 kN or
A distributed load of 9 kN/m?

 

[Villa vista]

Or 9kN per square meter

 

[hertzbo]

have received the following drawing, assume it means kN/sqm where it says kN/m and point load where it says xkN. Can a 25 cm concrete hollow block withstand this load?View attachment scan load.jpg

 

[anaitis]

If it is a single stone - Yes

If it concerns a wall, it depends mainly on the height.
In that case, you need to calculate the load case of buckling.

 

[anaitis]

have received the following drawing, assuming they mean kN/sqm where it says kN/m

The term kN/m refers to a line load. That is, the force per meter of length.
Distributed load is specified with kN/m2

 

[Villa vista]

If I see and understand correctly, you have point loads at the windows and Max 10 kN. Lightweight concrete can handle about 2 kN per mm2. If the point load is distributed over a block with a surface area of 250x100 mm, the pressure becomes 0.4 N per mm2.
That is, the stone should withstand the force as the hollow stone is stronger than lightweight concrete.

Note: I am not a structural engineer, so I might be wrong about most of what I wrote. But maybe someone in the forum can verify.

 

[hertzbo]

There is an existing foundation on a house. Ground floor with masonry walls 2.3 m high. We will demolish the upper floor and install prefab walls. So there is an existing floor there today, and it hasn't collapsed in 50 years. Now there will be 40 cm higher exterior walls and new trusses with a longer span, so I believe the load will increase compared to before. There are no old load calculations.