Steel bridge on roadway bridge (at coped end) (Part 2) 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 bridge on roadway bridge (at coped end) (Part 2) へ行く。
Steel bridge on roadway bridge (at coped end) (Part 2) の差分を削除

*Steel bridge on roadway bridge (at coped end)(part 2). [#d3cee161]

**1.Field of application [#g2845920]

>Steel bridge of The Hanshin Expressway, Japan.&br;

**2.Circumstances of repair [#l907e4b7]

>Fatigue cracks were found in the coped end of the plate girder in 1981 after 13 years of service.&br;

**3.Types of structure [#f1bee619]
>The outline of the bridge structure is as follows.&br;
-Bridge length : 50.0m
-Span length : 49.3 m
-Structure : Simple composite plate girder bridge.
-Deck : Reinforced concrete deck ( 17.0 cm thickness )
-Structural steel : SS 41 

>Elevation and cross section are shown in [[figure 1>#fig1]]. The number of the main girders which are deep at 2.2 m are six.  
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CENTER:&aname(fig1);&attachref(copede21.gif);&br;
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CENTER:Fig.1 Elevation and cross section &br;
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**4.Details of loading [#f4d304ad]
>Fluctuating loads due to highway live load.

**5.Description of damage [#b5c844ff]
>Fatigue cracks were found in the coped ends of the main girders ([[Fig.2>#fig2]]). As a result, fatigue cracks were also found in the coped end for some other bridges with the same structure.
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>Cause of fatigue cracks was as follows:&br;
-Concentration of stress unforeseen in design.
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CENTER:&aname(fig2);&attachref(copede22.jpg);&br;
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CENTER:&aname(fig2);&attachref(copede4.jpg);&br;
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CENTER:Fig.2 Crack location &br;
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**6.Repair method applied [#z13a7d7e]
>Repair and strengthening of parts subjected to cracking were performed by full penetration weld and bolt connection with rib plates ([[Fig.3>#fig3]]). 
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CENTER:&aname(fig3);&attachref(copede3.jpg);&br;
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CENTER:Fig.3 Bolt connection &br;
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