To summarize my thoughts to avoid misunderstandings (from my part in the beginning);
Line load along the long side, point loads in the transverse direction on the steel beam.
Line load along the long side, point loads in the transverse direction on the steel beam.
Mats-S
Construction veteran
· Sollentuna
· 3 327 posts
Mats-S
Construction veteran
- Sollentuna
- 3,327 posts
Hello!
I raised/corrected our summer house a few years ago. I did it gradually, installing new vertical plank beams under the house (the old ones were worn out/bad). I did the lifting gradually with temporary supports under the planks. The lift was from a few cm to about 6 cm at the worst spot.
Things to consider (depends a little on how much you need to lift):
- Before you start, open the doors, and any exposed windows. The house moves, and the doors risk getting stuck if they are not open. Windows risk cracking if they are in an exposed position.
- Lift gradually at all points, the method depends on how many jacks you have.
- Think about safety when you're under the house... secure the beams so that you never risk having the house fall on you...
Good luck with the lift!
I raised/corrected our summer house a few years ago. I did it gradually, installing new vertical plank beams under the house (the old ones were worn out/bad). I did the lifting gradually with temporary supports under the planks. The lift was from a few cm to about 6 cm at the worst spot.
Things to consider (depends a little on how much you need to lift):
- Before you start, open the doors, and any exposed windows. The house moves, and the doors risk getting stuck if they are not open. Windows risk cracking if they are in an exposed position.
- Lift gradually at all points, the method depends on how many jacks you have.
- Think about safety when you're under the house... secure the beams so that you never risk having the house fall on you...
Good luck with the lift!
Exactly, then we agree.
To begin some form of calculation, I'm thinking of the following slightly crazy reasoning:
The roof area per side is about 32 sqm (10.5x3), with a light roof (0.3) and snow load zone 4.5. The total load should thus be 4.8x31.5=151.2 kN. Assuming that the ridge takes half the load, this would mean that 75.6 kN is supported by the outer wall. The line load thus becomes 75.6/10.5=7.2 kN/m - reasonable?
This would in turn mean that each support column (including the wall along one short side) under the outer wall would carry 1/4 of the load, i.e. 18.9 kN. However, I haven't included the wall's own weight in this calculation, which may be negligible in this context?
Now, unfortunately, I have no idea how the point load over the middle floor can be calculated, which brings us back to the original question of whether I can instead use the calculated line load and add an estimated weight for the cabin itself?
I'm probably completely off track now, but I'm attempting a reasoning
Suppose a self-weight of 8000 kg distributed over 50 sqm, i.e. 160 kg/sqm ~ 2 kN/sqm. 2 kN x 50 sqm =100 kN, say the beam length is 5 meters, then the line load (if one beam is used) becomes 100/5=20 kN/m, but since there are a total of four beams (including the cast one), the line load per beam is 5 kN/m.
Now the snow load must also be taken into account, and since I also have no idea here how to calculate the line load in the transverse direction, maybe I can sum up the loads, 151.2+100=251.2kN and divide it by the beam length and number (251.2/5)/4=12.56 kN/m.
From that perspective, is there any reasonableness in calculating the line load this way? However, I don't want to dismiss your suggestion of point loads, scorp1on, I just lack the knowledge/imagination on how to proceed
Became a real wall of text, but is a good note for the future, on how or not how.
To begin some form of calculation, I'm thinking of the following slightly crazy reasoning:
The roof area per side is about 32 sqm (10.5x3), with a light roof (0.3) and snow load zone 4.5. The total load should thus be 4.8x31.5=151.2 kN. Assuming that the ridge takes half the load, this would mean that 75.6 kN is supported by the outer wall. The line load thus becomes 75.6/10.5=7.2 kN/m - reasonable?
This would in turn mean that each support column (including the wall along one short side) under the outer wall would carry 1/4 of the load, i.e. 18.9 kN. However, I haven't included the wall's own weight in this calculation, which may be negligible in this context?
Now, unfortunately, I have no idea how the point load over the middle floor can be calculated, which brings us back to the original question of whether I can instead use the calculated line load and add an estimated weight for the cabin itself?
I'm probably completely off track now, but I'm attempting a reasoning
Suppose a self-weight of 8000 kg distributed over 50 sqm, i.e. 160 kg/sqm ~ 2 kN/sqm. 2 kN x 50 sqm =100 kN, say the beam length is 5 meters, then the line load (if one beam is used) becomes 100/5=20 kN/m, but since there are a total of four beams (including the cast one), the line load per beam is 5 kN/m.
Now the snow load must also be taken into account, and since I also have no idea here how to calculate the line load in the transverse direction, maybe I can sum up the loads, 151.2+100=251.2kN and divide it by the beam length and number (251.2/5)/4=12.56 kN/m.
From that perspective, is there any reasonableness in calculating the line load this way? However, I don't want to dismiss your suggestion of point loads, scorp1on, I just lack the knowledge/imagination on how to proceed
Became a real wall of text, but is a good note for the future, on how or not how.
Your reasoning about the load per baseplate is not entirely wrong, but it is not correct to sum variable loads (snow, live load) and permanent loads according to the rules of the art. One calculates the design load by using partial coefficients, for example: 1.35*self-weight + 1.5*snow load, in addition to other factors as well.
The load on the steel beams will be subjected to point forces caused by the girders resting on them;
The load on the outer girders is loaded by a line load. Reaction forces, i.e., forces in the supports, will be the point forces that load the steel beams. Similarly for the girder in the middle.
PM me if you want help, otherwise, the thread will be extensive.
The load on the steel beams will be subjected to point forces caused by the girders resting on them;
The load on the outer girders is loaded by a line load. Reaction forces, i.e., forces in the supports, will be the point forces that load the steel beams. Similarly for the girder in the middle.
PM me if you want help, otherwise, the thread will be extensive.
Sounds like a good suggestion, thanks!