Problem Description
This example is Problem 9 from the ASME 1972 Program Verification and Qualification Library (reference ASME 1972). A three-dimensional, fixed-base cooling tower is analyzed for an asymmetrical wind pressure loading. Radial displacements over the height of the tower are compared with published results.
The geometry, properties and loading are as suggested in ASME 1972, except that the full tower is modeled rather than using symmetry conditions and modeling only half of the tower. A 24x17 mesh (tangential by height) is used for the tower. The tower wall is 7 inches thick.
Tested Features
- Three-dimensional analysis using shell elements
- Joint patterns
- Shell element surface pressure load using joint pattern
Result Comparison
App Link:
https://openbrim.org/objidaye4i5eqevev5naq2omexq.project
Library Link:
https://openbrim.org/objidv7rezcvhynimvwfng7b3qh.libobj
Elevation Z (ft) | Output Parameter | OpenBrIM | Sap2000 | Independent | Percent Difference (SAP2000 vs Independent) | Percent Difference (OpenBrIM vs Independent) |
|---|---|---|---|---|---|---|
| 60 | Ux(jt 18) ft | -0.2501 | -0.276 | -0.26 | 4% | 3.81% |
| 45 | Ux(jt 17) ft | -0.2928 | -0.325 | -0.31 | 3% | 5.55% |
| 30 | Ux(jt 16) ft | -0.3357 | -0.366 | -0.35 | 4% | 4.09% |
| 15 | Ux(jt 15) ft | -0.3677 | -0.397 | -0.39 | 2% | 5.72% |
| 0 | Ux(jt 14) ft | -0.3899 | -0.416 | -0.41 | 1% | 4.90% |
| -10 | Ux(jt 13) ft | -0.3982 | -0.423 | -0.42 | 1% | 5.19% |
| -25 | Ux(jt 12) ft | -0.3997 | -0.423 | -0.43 | -2% | 7.05% |
| -50 | Ux(jt 11) ft | -0.3802 | -0.400 | -0.41 | -2% | 7.27% |
| -75 | Ux(jt 10) ft | -0.3391 | -0.355 | -0.37 | -3% | 8.35% |
| -100 | Ux(jt 9) ft | -0.2849 | -0.297 | -0.31 | -3% | 8.10% |
| -125 | Ux(jt 8) ft | -0.226 | -0.235 | -0.25 | -3% | 9.60% |
| -150 | Ux(jt 7) ft | -0.1695 | -0.176 | -0.18 | -1% | 5.83% |
| -175 | Ux(jt 6) ft | -0.1195 | -0.124 | -0.13 | -1% | 8.08% |
| -200 | Ux(jt 5) ft | -0.0785 | -0.081 | -0.08 | 0% | 1.88% |
| -225 | Ux(jt 4) ft | -0.0472 | -0.048 | -0.05 | 0% | 5.60% |
| -250 | Ux(jt 3) ft | -0.0267 | -0.028 | -0.02 | 2% | -33.50% |
| -260 | Ux(jt 2) ft | -0.0162 | -0.016 | -0.01 | 1% | -62.00% |
| -270 | Ux(jt 1) ft | 0.0000 | 0.000 | 0.00 | 0% | 0 |
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