Steel bridge on Hanshin Expressway (at branching girder end)
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*Steel bridge on Hanshin Expressway (at branching girder end) [#b52614ed]
**1.Field of application [#mef760dc]
>Steel bridge on Hanshin Expressway ,Osaka, Japan.&br;
**2.Circumstances of Repair [#x210af89]
>Fatigue crack was found in the weld of the branching girder end at the girder connection in Nov. 1984.&br;
**3.Types of structure [#s829e327]
>The bridge is composite simple I-section girder bridge. The branching girder area are available as a space of the emergent parking. One side of the branching girders was weld connected to the main girder web and other side was supported by the pier. The framing plan is shown in [[figure 1>#fig1]].&br;
&br;
&br;
CENTER:&aname(fig1);&attachref(Hnako38.jpg);&br;
&br;
CENTER:Fig.1 Framing plan.&br;
&br;
&br;
**4.Details of loading [#i430ced5]
>Fluctuating loads due to highway live load.
**5.Description of damage [#s67693be]
>Fatigue crack occurred in the weld root between the girder web and the branching girder web ([[Fig.2>#fig2]],[[3>#fig3]]). No the crack propagated into the girder web and the girder bottom flange.&br;
&br;
&br;
>Causes of fatigue cracks were as follows:
-Weld defect such as lack of fusion and inclusion of slag ([[Fig.2>#fig2]]).
-Minor out-of-plan distortion of the girder web at the branching girder connection.
&br;
&br;
CENTER:&aname(fig2);&attachref(Hnako39.jpg);&br;
&br;
CENTER:Fig.2 Crack of the weld root.&br;
&br;
&br;
CENTER:&aname(fig3);&attachref(Hnako310.jpg);&br;
&br;
CENTER:Fig.3 Crack location.&br;
&br;
&br;
**6.Repair method applied [#q69a26e5]
>Repair of parts subjected to cracking was performed by gouging of the damaged area and re-welding.
>Additionally a reinforcing plate was fillet weld connected to the outside surface of both girders' webs ([[Fig.4>#fig4]]).
&br;
&br;
CENTER:&aname(fig4);&attachref(Hnako311.jpg);&br;
&br;
&br;
CENTER:Fig.4 Strengthening method.&br;
&br;
&br;
終了行:
*Steel bridge on Hanshin Expressway (at branching girder end) [#b52614ed]
**1.Field of application [#mef760dc]
>Steel bridge on Hanshin Expressway ,Osaka, Japan.&br;
**2.Circumstances of Repair [#x210af89]
>Fatigue crack was found in the weld of the branching girder end at the girder connection in Nov. 1984.&br;
**3.Types of structure [#s829e327]
>The bridge is composite simple I-section girder bridge. The branching girder area are available as a space of the emergent parking. One side of the branching girders was weld connected to the main girder web and other side was supported by the pier. The framing plan is shown in [[figure 1>#fig1]].&br;
&br;
&br;
CENTER:&aname(fig1);&attachref(Hnako38.jpg);&br;
&br;
CENTER:Fig.1 Framing plan.&br;
&br;
&br;
**4.Details of loading [#i430ced5]
>Fluctuating loads due to highway live load.
**5.Description of damage [#s67693be]
>Fatigue crack occurred in the weld root between the girder web and the branching girder web ([[Fig.2>#fig2]],[[3>#fig3]]). No the crack propagated into the girder web and the girder bottom flange.&br;
&br;
&br;
>Causes of fatigue cracks were as follows:
-Weld defect such as lack of fusion and inclusion of slag ([[Fig.2>#fig2]]).
-Minor out-of-plan distortion of the girder web at the branching girder connection.
&br;
&br;
CENTER:&aname(fig2);&attachref(Hnako39.jpg);&br;
&br;
CENTER:Fig.2 Crack of the weld root.&br;
&br;
&br;
CENTER:&aname(fig3);&attachref(Hnako310.jpg);&br;
&br;
CENTER:Fig.3 Crack location.&br;
&br;
&br;
**6.Repair method applied [#q69a26e5]
>Repair of parts subjected to cracking was performed by gouging of the damaged area and re-welding.
>Additionally a reinforcing plate was fillet weld connected to the outside surface of both girders' webs ([[Fig.4>#fig4]]).
&br;
&br;
CENTER:&aname(fig4);&attachref(Hnako311.jpg);&br;
&br;
&br;
CENTER:Fig.4 Strengthening method.&br;
&br;
&br;
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