Steel bridge on roadway bridge (at coped end) (Part 2)
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*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.
&br;
&br;
CENTER:&aname(fig1);&attachref(copede21.gif);&br;
&br;
CENTER:Fig.1 Elevation and cross section &br;
&br;
&br;
**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.
&br;
>Cause of fatigue cracks was as follows:&br;
-Concentration of stress unforeseen in design.
&br;
&br;
CENTER:&aname(fig2);&attachref(copede22.jpg);&br;
&br;
&br;
CENTER:&aname(fig2);&attachref(copede4.jpg);&br;
&br;
CENTER:Fig.2 Crack location &br;
&br;
&br;
**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]]).
&br;
&br;
CENTER:&aname(fig3);&attachref(copede3.jpg);&br;
&br;
CENTER:Fig.3 Bolt connection &br;
&br;
&br;
終了行:
*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.
&br;
&br;
CENTER:&aname(fig1);&attachref(copede21.gif);&br;
&br;
CENTER:Fig.1 Elevation and cross section &br;
&br;
&br;
**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.
&br;
>Cause of fatigue cracks was as follows:&br;
-Concentration of stress unforeseen in design.
&br;
&br;
CENTER:&aname(fig2);&attachref(copede22.jpg);&br;
&br;
&br;
CENTER:&aname(fig2);&attachref(copede4.jpg);&br;
&br;
CENTER:Fig.2 Crack location &br;
&br;
&br;
**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]]).
&br;
&br;
CENTER:&aname(fig3);&attachref(copede3.jpg);&br;
&br;
CENTER:Fig.3 Bolt connection &br;
&br;
&br;
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