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Characteristics of the feedforward neural network
| Category | Details |
|---|---|
| Input Features | Displacement and strains on longitudinal direction. |
| Target Outputs | Crack width data (top and bottom extreme fibres), strains (on the transverse direction), stresses (on the transverse and longitudinal directions), and displacements (on the transverse and vertical directions). |
| Preprocessing | – Zero values replaced with non-zero means or 1e-3. |
| Data Split | – Training: 60% |
| Network Architecture | – Input Layer: the same size as input features. |
| Optimization | – Optimizer: Adam. |
| Loss Function | Mean Squared Error (MSE). |
| Metrics | Mean Absolute Error (MAE). |
| Training Parameters | – Batch Size: 32. |
| Regularization | – L2 Regularization (1e-4). |
| Evaluation | Final test performance: MSE and MAE metrics. |
Selected nodes
| Node | Type of sensor | Location |
|---|---|---|
| 183 | × | Bottom of the left box girder at support 15/1 |
| 355 | Displacement | at support 13/4 |
| 356 | Displacement | at support 13/3 |
| 357 | Displacement | at support 13/2 |
| 358 | Displacement | at support 13/1 |
| 360 | × | at support 14/3 |
| 361 | Displacement | at support 15/4 |
| 362 | Displacement | at support 15/3 |
| 363 | Displacement | at support 16/4 |
| 364 | Displacement | at support 16/3 |
| 365 | × | at support 14/2 |
| 368 | × | at support 15/1 |
| 369 | Displacement | at support 16/2 |
| 370 | Displacement | at support 16/1 |
| 375 | × | Bottom slab of the box girder near Support 14/3 |
| 377 | × | Bottom slab of the box girder near support 14/2 |
| 1817 | Strain | Bottom slab of the right-side box girder in the first quarter of the bridge |
| 3851 | × | Bottom of the transverse wall at the middle cross-section on the left-side box girder |
| 5151 | Strain | Bottom slab of the right-side box girder in the third quarter of the bridge |
| 7438 | × | Middle top of the transverse wall at Pier 14 |
| 8279 | Strain | Top slab in the right-side box girder near Pier 14 (right side) |
| 8438 | Strain | Right-side internal wall of the right box girder at the middle cross-section of the bridge |
| 9280 | Strain | Top slab of the right-side box girder at Pier 14 (left side) |
| 9287 | Strain | Left-side internal wall of the right box girder at the middle cross-section of the bridge |
| 9407 | Strain | Top slab of the right-side box girder in the second quarter of the bridge |