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In this model, time history analyses the output sampling time interval used is 0.02 seconds and response is calculated for the first 8 seconds of the record. The independent analysis has an output sampling time interval of 0.1 seconds.
Important Note: The AISC section properties in the database file SECTIONS8.PRO are not used in this example and the required section properties are explicitly entered. This is intentional because most of the sections used in the example are older sections not in the current AISC database.
Results Comparison
Time Periods ( Load Case MODAL)
| Output Parameter | OpenBrIM | SAP2000 | Independent | Pecent Difference OpenBrIM - Independent | Pecent Difference SAP2000- Independent |
|---|---|---|---|---|---|
| Mode 1 period (sec) | 1.2732 | 1.2732 | 0% | ||
| Mode 2 period (sec) | 0.4313 | 0.4313 | 0% | ||
| Mode 3 period (sec) | 0.2420 | 0.2420 | 0% | ||
| Mode 4 period (sec) | 0.1602 | 0.1602 | 0% | ||
| Mode 5 period (sec) | 0.1190 | 0.1190 | 0% | ||
| Mode 6 period (sec) | 0.0951 | 0.0951 | 0% | ||
| Mode 7 period (sec) | 0.0795 | 0.0795 | 0% |
Static Lateral Analysis Results (Load case LAT)
| Output Parameter | OpenBrIM | SAP2000 | Independent | Pecent Difference OpenBrIM - Independent | Pecent Difference SAP2000- Independent |
|---|---|---|---|---|---|
| Ux at joint 22 (in) | 1.4508 | 1.45076 | 1.45076 | 0% | 0% |
| Axial force in frame 1 (kip) | 69.99 | 69.99 | 69.99 | 0% | 0% |
| Moment in frame 1 at joint 1 (k-in) | 2324.6969 | 2324.68 | 2324.68 | 0% | 0% |
Response Spectrum Analysis Results (Load case SPECSRSS)
| Output Parameter | OpenBrIM | SAP2000 | Independent | Pecent Difference OpenBrIM - Independent | Pecent Difference SAP2000- Independent |
|---|---|---|---|---|---|
| Ux at joint 22 (in) | 5.4325 | 5.436 | 5.438 | 0.1% | 0% |
| Axial force in frame 1 (kip) | 261.5752 | 261.7 | 261.8 | 0% | 0% |
| Moment in frame 1 at joint 1 (k-in) | 9915.6056 | 9864 | 9868 | 0.48% | 0% |
Response Spectrum Analysis Results (Load case SPECCQC)
| Output Parameter | OpenBrIM | SAP2000 | Independent | Pecent Difference OpenBrIM - Independent | Pecent Difference SAP2000- Independent |
|---|---|---|---|---|---|
| Ux at joint 22 (in) | 5.4325 | 5.431 | 5.438 | 0.1% | 0% |
| Axial force in frame 1 (kip) | 261.5752 | 261.5 | 261.8 | 0% | 0% |
| Moment in frame 1 at joint 1 (k-in) | 9915.6056 | 9916 | 9868 | 0.48% | 0.49% |
Tested Features
- Diaphragm constraint
- Joint force assignments
- Joint mass assignments
- Modal analysis for eigenvalues
- Response spectrum analysis
- Modal time history analysis for base excitation
- Direct integration time history analysis for base excitation