Steel transverse beam on The Metropolitan Expressway の変更点

追加された行はこの色です。
削除された行はこの色です。
Steel transverse beam on The Metropolitan Expressway へ行く。
Steel transverse beam on The Metropolitan Expressway の差分を削除

*Steel transverse beam on The Metropolitan Expressway [#d9b7ab3f]
*首都高速道路の鋼製横梁[#d9b7ab3f]

**1.Field of application [#q0cdf973]

>Steel transverse beam on The Metropolitan Expressway , Japan.&br;
>首都高速道路の鋼製横梁

**2.Circumstances of Repair [#p0b09a1e]

>Fatigue cracks were found in welded joints of diaphragms which were under girder supports.
>主桁支点部にあるダイヤフラムの溶接継手において疲労き裂が見つかった。

**3.Types of structure [#rd697226]

>Steel transverse beam with box section.
>箱断面の鋼製横梁

**4.Details of loading [#bd71a763]
>Fluctuating loads due to highway live load. 
>活荷重

**5.Description of damage [#ze8ae168]
>Fatigue cracks location are shown in [[Fig.1>#fig1]].Photograph of Type1-crack is shown in [[Fig.2>#fig2]].Photograph of Type2-crack and Type5-crack are shown in [[Fig.3>#fig3]]
&br; 
>[[図.1>#fig1]]に疲労き裂の位置を示す。[[図.2>#fig2]]にType-1の疲労き裂の写真を示す。[[図.3>#fig3]]にType-2とType-5の疲労き裂の写真を示す。
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CENTER:&aname(fig1);&attachref(./beam_shutoko_1.jpg,40%);&br;
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CENTER:Fig.1 Crack location 
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CENTER:図.1 き裂位置 
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CENTER:&aname(fig2);&attachref(./beam_shutoko_2.jpg,40%);&br;
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CENTER:Fig.2 Type1-crack   
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CENTER:図.2 Type1の疲労き裂   
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CENTER:&aname(fig3);&attachref(./beam_shutoko_3.jpg,40%);&br;
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CENTER:Fig.3 Type2-crack and Type5-crack   
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CENTER:図.3 Type2とType5の疲労き裂   
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>Causes of fatigue cracks were as follows:
>疲労き裂の原因は次のとおりである：
-Stress consentration due to sudden change in rigidity.
-Local deformation at the scallop.

-剛性の急変による応力集中
-スカーラップでの局部変形

**6.Repair method applied [#i29234cc]
>Emergency repair 
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>応急的処置
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>Stop holes were drilled at the crack tips. 
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>疲労き裂の先端付近にストップホールを施工した。
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**Reference [#fe2c069f]
>Kinomoto et al,A study on The Fatigue Cracks at Welded Joints of Transverse Beam Diaphragms which were Under Girder Supports ,'''Prc.of Annual Conferenece of JSCE''',vol.59,2004.(In Japanese)
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