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.
tokaido_4.jpg

Fig.4 Photographs of the cracks

As a result of FEM analysis,the causes to show as follows were estimated.

Causes of fategue cracks-A were as follows:

  1. The stringers begin to bend with approach of the train.
  2. Therefore the connections move so that the angle variation occurs.
  3. The support plates on the stiffeners were forcedly rotated with the action.
  4. As a result,high stresses occur to the top side of the stiffeners.
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6.Repair method applied †

The Reinforcement structure that was adopted is shown in Fig.5.

tokaido_5.jpg

Fig.5 Repair method.
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Reference †

Kazuya TAKAHASHI,Shigeru NAITO,Masaki SEKI,Atsushi ICHIKAWA and Chitoshi MIKI,IDENTIFICATION OF CAUSES OF FATIGUE DAMAGE IN CONNECTIONS BETWEEN STRINGERS AND FLOORBEAMS IN STEEL RAILWAY TRUSSES,Journal of JSCE,A,vol.64.No.2,pp235-247,2008.4(In Japanese)

Kazuya TAKAHASHI,Shigeru NAITO,Masaki SEKI,Atsushi ICHIKAWA and Chitoshi MIKI,FATIGUE PERFORMANCE OF CONNECTIONS BETWEEN STRINGERS AND FLOORBEAMS IN STEEL RAILWAY TRUSSES AND ITS IMPROVEMENTS,Journal of JSCE,A,vol.64.No.2,pp394-407,2008.4(In Japanese)

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