事例１のバックアップ(No.1)

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- 1 (2023-01-26 (木) 17:43:18)

Steel bridge of The Metropolitan Expressway (welded joint between longitudinal trough rib and orthotropic deck plate ) †

1.Field of application †

The bayshore Route of The Metropolitan Expressway, Japan.

2.Circumstances of repair †

Fatigue cracks were detected on welded joints between longitudinal trough rib and orthotropic deck plate after 15 years of service.

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3.Types of structure †

The outline of the bridge structure is as follows.

Bridge length : 232.0m,

Span length :70m+92m+70m

Structure : Box girder bridge with orthotropic deck system

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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 detected on welded joints between longitudinal trough ribs and orthotropic deck plates(Fig.1).

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Fig.1 Crack location

Cause of fatigue cracks was as follows:

Localized stress concentration which resulted from the out-of-plane of the deck plate deflection due to the wheel load.

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6.Repair method applied †

Emergency repair

Stop holes were drilled at the crack tips(Fig.2).

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Fig.2 Stop holes

Permanent repair

The SFRC pavements were constructed on the orthotropic deck plates instead of asphalt pavements.(Fig.3,Fig.4,).

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Fig.3 Construction circumstance of SFRC pavements

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Fig.4 The standard cross section of the SFRC pavements

事例１ のバックアップ(No.1)

Steel bridge of The Metropolitan Expressway (welded joint between longitudinal trough rib and orthotropic deck plate ) †

1.Field of application †

2.Circumstances of repair †

3.Types of structure †

4.Details of loading †

5.Description of damage †

6.Repair method applied †

事例１のバックアップ(No.1)