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*Shinkansen Br. (fatigue cracks at main girder - floorbeam connection) [#ud8a2263]
*新幹線の橋梁（主桁と横桁連結部の疲労き裂）[#ud8a2263]

**1.Field of application [#g9bb11ab]

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Steel bridge on Shinkansen-railway, Japan
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>新幹線の鋼橋

**2.Circumstances of repair [#v7db577b]

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Fatigue cracks at maingirder - floorbeam connection were found in 1974(after 10 years service).
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>供用開始から10年が経過した1974年、主桁と横桁の連結部に疲労き裂が見つかった。

**3.Types of structure [#b4e6eb4a]
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One through type girders[[(Fig.1)>#fig1]]
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>下路式の鈑桁橋[[(図.1)>#fig1]]

CENTER:&aname(fig1);&attachref(Shinkansen_MF_fig1.gif);&br;
CENTER:Fig.1&br;
CENTER:図.1　疲労き裂の位置&br;
**4.Details of loading [#r8fbddf6]
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Fluctuating loads due to Shinkansen trains traffic. 
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>新幹線荷重

**5.Description of damage and repair method applied [#l1d68d97]
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>再溶接と当て板補強（高力ボルト固定）を行った。

CENTER:&attachref(Shinka5.gif);&br;
CENTER:&attachref(Shinka1.gif);&br;
CENTER:&attachref(Shinka2.gif);&br;
CENTER:&attachref(Shinkansen_MF_fig5.gif);&br;
CENTER:&attachref(Shinka3.gif);&br;
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CENTER:&attachref(Shinka4.gif);&br;