Discussion
Wall and floor pressures in a grain bin, comparing Janssen's analysis with a liquid model.
| Depth (m) | Janssen floor pressure (kPa) | Liquid model (kPa) |
|---|---|---|
| 2 | 13.9 | 14.9 |
| 4 | 24.0 | 29.8 |
| 8 | 36.1 | 59.6 |
| 12 | 42.0 | 89.4 |
What does the comparison show?
Answer: D
By twelve metres the liquid model predicts more than twice the true floor pressure, because it ignores the weight the walls are carrying. Designing on the liquid assumption would oversize the floor and undersize the walls.
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