Shinkansen Br.(connections between stringers and floorbeams in steel railway trusses) 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。
Shinkansen Br.(connections between stringers and floorbeams in steel railway trusses) へ行く。
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*Shinkansen Br.(connections between stringers and floorbeams in steel railway trusses) [#v6d1d7cc]
*新幹線の橋梁（鋼トラス橋の縦桁と横桁の連結部）[#v6d1d7cc]
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**1.Field of application [#r4424718]
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>Steel bridge on Tokaido Shinkansen-railway, Japan.&br;
>東海道新幹線の鋼橋
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**2.Circumstances of Repair [#ma1b1f85]
>Fatigue cracks at connections between stringers and floorbeams were found in 2004 after 40 years service.
>供用開始から40年が経過した2004年、縦桁と横桁の連結部に疲労き裂が発見された。
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**3.Types of structure [#if0d3259]
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>The outline of the bridge structure is as follows.
>橋梁の構造諸元は次のとおりである。
-Bridge length : 60.0 m
-Span length : 60.0 m
-Structure : Simple thurugh type truss
-Structural steel : unknown

-橋長：60.0m
-支間長：60.0m
-橋梁形式：単純下路トラス橋
-使用鋼材：不明

>Elevation and plan of the bridge are shown in [[Fig.1>#fig1]].
>側面図と平面図を[[図.1>#fig1]]に示す。

CENTER:&aname(fig1);&attachref(./tokaido_1.jpg,40%);&br;
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CENTER:Fig.1 Elavation and plan(In japanese)
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CENTER:図.1 側面図と平面図
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**4.Details of loading [#tc28a883]
>300 Shinkansen trains / day .
>300新幹線車両/日

**5.Description of damage [#q37ad518]
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>The detail of connections between stringers and floorbeams is shown in [[Fig.2>#fig2]].The detail of cracks and photographs are shown in [[Fig.3>#fig3]],[[Fig.4>#fig4]].
&br;
>[[図.2>#fig2]]に縦桁と横桁の連結部の詳細を示す。[[図.3>#fig3]]と[[図.4>#fig4]]にそれぞれ疲労き裂の詳細と写真を示す。
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CENTER:&aname(fig2);&attachref(./tokaido_2.jpg,25%);&br;
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CENTER:Fig.2 Connections between stringers and floorbeams
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CENTER:図.2 縦桁と横桁の連結部
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CENTER:&aname(fig3);&attachref(./tokaido_3.jpg,25%);&br;
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CENTER:Fig.3 Crack detail.
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CENTER:図.3 き裂の詳細
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CENTER:&aname(fig4);&attachref(./tokaido_4.jpg,25%);&br;
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CENTER:Fig.4 Photographs of the cracks
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CENTER:図.4 き裂の写真
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>As a result of FEM analysis,the causes to show as follows were estimated.
>FEM解析の結果、疲労き裂の原因は次のように推定される。
>Causes of fategue cracks-A were as follows:&br;
>Crack-Aの原因は次のとおりである。
+The stringers begin to bend with approach of the train.
+Therefore the connections move so that the angle variation occurs.
+The support plates on the stiffeners were forcedly rotated with the action.
+As a result,high stresses occur to the top side of the stiffeners.

+列車の接近で縦桁が曲げを受ける。
+連結部に回転角が生じる。
+補剛材上のサポートプレートが強制的に回転する。
+結果として補剛財の上端部に高い応力が発生する。

**6.Repair method applied [#q07b694f]
> The Reinforcement structure that was adopted is shown in [[Fig.5>#fig5]].
&br;
>[[図.5>#fig5]]に示すように補強を行った。
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CENTER:&aname(fig5);&attachref(./tokaido_5.jpg,25%);&br;
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CENTER:Fig.5 Repair method.
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CENTER:図.5 補修方法
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**Reference [#m256da60]
>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)
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>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)