Jhojuin Br. (connection plates between floor beams and truss chords) †

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1.Field of application †

Steel bridge of The Hanshin Expressway, Japan.

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2.Circumstances of repair †

Fatigue cracks were found in the coped end of the plate girder in 1981 after 13 years of service.

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3.Types of structure †

The outline of the bridge structure is as follows.

Elevation and cross section are shown in figure 1. The number of the main girders which are deep at 2.2 m are six.

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Fig.1 Elevation and cross section


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4.Details of loading †

Fluctuating loads due to highway live load.

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5.Description of damage †

Fatigue cracks were found in the coped ends of the main girders (Fig.2). As a result, fatigue cracks were also found in the coped end for some other bridges with the same structure.

Cause of fatigue cracks was as follows:

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6.Repair method applied †

Repair and strengthening of parts subjected to cracking were performed by full penetration weld and bolt connection with rib plates (Fig.3).

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Fig.3 Bolt connection


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