Shinkansen Br.(connections between stringers and floorbeams in steel railway trusses) †

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1.Field of application †

Steel bridge on Tokaido Shinkansen-railway, Japan.

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2.Circumstances of Repair †

Fatigue cracks at connections between stringers and floorbeams were found in 2004 after 40 years service.

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3.Types of structure †

The outline of the bridge structure is as follows.

Elevation and plan of the bridge are shown in Fig.1.

tokaido_1.jpg

Fig.1 Elavation and plan(In japanese)
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4.Details of loading †

300 Shinkansen trains / day .

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5.Description of damage †

The detail of connections between stringers and floorbeams is shown in Fig.2.The detail of cracks and photographs are shown in Fig.3,Fig.4.

tokaido_2.jpg

Fig.2 Connections between stringers and floorbeams
tokaido_3.jpg

Fig.3 Crack detail.

Cause of fatigue cracks was as follows:

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6.Repair method applied †

Firstly,stop-holes(φ=20mm)were drilled at the crack tips(Fig.4).

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Fig.4 Stop hole.

Secondaty,bolted splice plates was installed on the web plat of the diagonal member(Fig.5).

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Fig.5 Bolted splice plates.

Finaly,steel bars were tightened to moderate stresses(Fig.6).

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Fig.6 Moderate stresses by tightened steel bar.

The original diagonal member was replaced with new one in May 2010. (Fig.7).

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Fig.7 Completion view.

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Reference †

Kaneko Tetsuya,A study on the Retrofits of Ikitsuki Bridge,Kyushu Gihou,vol.48,2011.01(In Japanese)

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