Research Article
Insights into Underrail Rubber Pad’s Effect on Vehicle-Track-Viaduct System Dynamics
Table 3
Dynamic parameters of track-bridge structure.
| Components | Item/symbol/unit | Values |
| Rail | Elastic modulus (N/m2) | 2.1 e11 | Moment of inertia of section (m4) | 3.217e − 5 | Density (kg/m3) | 7850 | Sectional area (m2) | 7.745e − 3 | Shear modulus (N/m2) | 7.7e10 | Section factor (κ) | 0.4 | Loss factor (ηr) | 0.01 | Stiffness (MN/m) | Temperature/frequency variant |
| Fastener | Loss factor | Temperature/frequency variant | Fastener space (m) | 0.625 | Elastic modulus (N/m2) | 3.6e10 | Moment of inertia of section (m4) | 1.7e − 3 |
| Slab | Density (kg/m3) | 2500 | Sectional area (m2) | 0.51 | Loss factor | 0.1 | Stiffness (N/m) | 3.79e11 |
| CA mortar | Loss factor | 0.2 | Elastic modulus (N/m2) | 3.0e10 | Moment of inertia of section (m4) | 7.3125e − 3 |
| Base plate | Density (kg/m3) | 2500 | Sectional area (m2) | 0.975 | Loss factor | 0.1 | Stiffness (N/m) | 2.1e11 |
| Slipping layer | Loss factor | 0.2 | Length (m) | 32 | Elastic modulus (N/m2) | 3.6e10 | Moment of inertia of section (m4) | 11.056 |
| Viaduct | Density (kg/m3) | 2650 | Sectional area (m2) | 9.089 | Loss factor | 0.1 | Stiffness (N/m) | 6e9 |
| Viaduct bearing | Bearing spatial interval (m) | 32 | Loss factor | 0.25 |
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