Steel transverse beam on The Metropolitan Expressway のバックアップ(No.2) - PukiWiki

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Steel transverse beam on The Metropolitan Expressway へ行く。
- 1 (2014-02-06 (木) 13:22:17)
- 2 (2014-02-06 (木) 14:52:17)
- 3 (2014-02-06 (木) 16:56:51)
- 4 (2014-04-23 (水) 11:37:03)

Steel transverse beam on The Metropolitan Expressway †

1.Field of application †

Steel transverse beam on The Metropolitan Expressway , Japan.

2.Circumstances of Repair †

Fatigue cracks were found in welded joints of diaphragms which were under girder supports.

3.Types of structure †

Steel transverse beam with box section.

4.Details of loading †

Fluctuating loads due to highway live load.

5.Description of damage †

Fatigue cracks location are shown in Fig.1.Photograph of Type1-crack is shown in Fig.2.Photograph of Type2-crack and Type5-crack are shown in Fig.3

Fig.1 Crack location

Fig.2 Type1-crack

Fig.3 Type2-crack and Type5-crack

Causes of fatigue cracks were as follows:

Stress consentration due to sudden change in rigidity.

Local deformation at the scallop.

6.Repair method applied †

As the temporally-repair,bolted splice plates(Fig.3,Fig.4) were installed on the box webs of the connections.This repairing decreased the measured stress by about 50%,so that these piers could be used safely temporally.But it was needed to remove all the fatigue cracks as the final repair.

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Fig.3 Bolted splice plates

File not found: "pier_shutoko_4.jpg" at page "Steel transverse beam on The Metropolitan Expressway"[ź��]

Fig.4 Construction photograph of bolted splice plates

Reference †

Hisashi MORIKAWA,Tetsuhiro SHIMOZATO,Chitoshi MIKI and Atsushi ICHIKAWA,STUDY ON FATIGUE CRACKING IN STEEL BRIDGE PIERS WITH BOX SECTION AND TEMPORALLY REPAIRING,Journal of JSCE,No.703/I-59,pp177-183,2002.4(In Japanese)