Steel bridge on Hanshin Expressway (at floor-beam coped end) †

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1.Field of application †

Steel bridge on Kobe-Nishinomiya line of Hanshin Expressway, Japan.

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2.Circumstances of Repair †

Fatigue crack was found in the end floorbeam coped web in May 1988.

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3.Types of structure †

The bridge is I-section girder bridge with three continuous spans (Fig.1). The floorbeams were bolt connected to the connection stiffeners.


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Fig.1 I-section girder bridge.


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4.Details of loading †

Fluctuating loads due to highway live load.

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5.Description of damage †

Fatigue crack occurred in the coped web of the end floorbeam (Fig.2,3,4). At the detection of the crack, the crack length reached to 530mm at the G5 location. The support of the G5 girder had subsided 7mm.


Cause of fatigue cracks was as follows:

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6.Repair method applied †

Firstly, repair of parts subjected to cracking was performed by stop hole, gouging and re-welding.

Secondary, the cracked web was bolt spliced (Fig.5,6).

Beside, the original base mortar under the shoe of the G5 girder were replaced by the new non-shrink mortar after re-installing the shoe.


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Fig.5 Repair method.


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Fig.6 Complete view.


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