Repair of fatigue loaded welded structures †

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CAUSES AND REPAIRING METHODS OF FATIGUE DAMAGED BRIDGES †

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The causes of fatigue of steel bridge may be classified as follows. †

1.Welding defects were included at the time of fabrication.
2.An inappropriate structural detail of low fatigue strength had been adopted.
3.Stresses and deformations unforeseen in design occurred at joints of members.
4.The structure behaved in a manner not expected such as due to vibration.

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There are two approaches to repairing and retrofitting, removal of the cause of damage or to alleviate it and increasing the fatigue strength of the detail. The concrete measures are as follows. †

A.removal of crack
B.re-weld
C.surface treatments such as TIG dressing and Peening.
D.re-weld + post weld surface treatments
E.bolted splice
F.shape improving
G.stop hole
H.modification of connection detail

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Applicability of these methods is shown in the following table. †


1A1B1D1E1F1H
2A2B2C2D2E2F2G2H
3A3B3C3D3E3F3G3H
4A4B4C4D4E4F4G4H


ExcellentGoodFairNo good


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