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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