Description
The SRS entry defines a set of grid point locations for which a structural response spectrum will be computed for the dynamic event.
Format
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| SRS | SID | NSID | MINFREQ | MAXFREQ | NUMINC | FILTERF | GRAV |
Example
| SRS | 5 | 99 | 100. | 8000. | 1000. | 1000. | 386.4 | ||
| 1. | 2. | 3. | 4. | 5. |
| Field | Definition | Type | Default |
|---|---|---|---|
| SID | Identification number. | Integer > 0 | Required
See Remark 1 |
| NSID | Set identification number. | Integer > 0 | Required
See Remark 2 |
| MINFREQ | Minimum frequency (Hertz) for structural response spectrum. | Real | 1. |
| MAXFREQ | Maximum frequency (Hertz) for structural response spectrum. | Real | 200. |
| NUMINC | Number of frequence increments in structural response spectrum. | Integer > 0 | 100 |
| FILTERF | Filter frequency (Hertz). | Real ≥ 0 | 1. |
| DFi | Damping fractions (percent of critical damping) | Real | See Remark 4 |
Remarks
- SID must reference a DLOAD ID in the Case Definition.
- NSID must reference a valid set of GRID IDs defined in the Case Definition.
- If the FILTERF value is zero the acceleration history is not filtered prior to computing the structural response spectrum.
- Enter as many damping factors as desired. The case for zero damping is automatically included so the line containing damping factors can simply be skipped if desired.