Table 2
Typical fatigue damage on steel structures of inspected Vietnam railway bridges.
| Fatigue damage | Occurrences | Degrees | Main causes |
|---|---|---|---|
| Cracks of welded lines and weaken locations | Frequent (80% bridges) | Serious | Traffic overloads (incrased weights and speeds) as well as structural vibrations of modern trains impose on railway bridges |
| Over-sags of bridge decks and girders | Frequent (60% bridges) | Moderate | Exceeded collisions of large moving trains and vessels against railway bridges |
| Over-displacement of steel elements | Sometimes (40% bridges) | Moderate | Other causes of missiles, bombs and explosions due to the wars |
| Joint breaking and damage of steel joints | Sometimes (30% bridges) | Moderate | External impacts, natural disasters and so on |
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