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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