Mashita Bridge
をテンプレートにして作成
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開始行:
*Mashita Bridge [#i0a7d8c9]
**1.Field of application [#i599a773]
>Through-type Langer bridge on the roadway bridge, Japan.&br;
**2.Circumstances of Repair [#u882a38e]
>Fatigue cracks were found at the joint of the vertical member and the tie girder.
**3.Types of structure [#c0ce81ce]
>This bridge is the through-type Langer bridge of which arch span length is 66m ([[Fig.1>#fig1]]). The vertical members were H-type section and were weld connected to the top flange of the tie girders.
&br;
&br;
CENTER:&aname(fig1);&attachref(Mashit26.gif);&br;
&br;
CENTER:Fig.1 Through-type Langer bridge.&br;
**4.Details of loading [#z09b72b6]
>Fluctuating loads due to wind load.
**5.Description of damage [#id2681d9]
>Fatigue cracks occurred in the joint of the vertical member and tie girder ([[Fig.2>#fig2]]). The vertical members at the middle part of the bridge suffered the vibration due to wind of which speed was about 15 m/s. Cause of fatigue cracks is as follows. Vibration of the vertical members which was caused by Kerman's vortex.
&br;
&br;
CENTER:&aname(fig2);&attachref(Mashit27.gif);&br;
&br;
CENTER:&aname(fig2);&attachref(Mashit28.gif);&br;
&br;
CENTER:Fig.2 Crack which occurred in the joint of the vertical member and tie girder.&br;
&br;
&br;
**6.Repair method applied [#p649a511]
-Emergency repair
>Fracture part were pulled back by wire rope. To prevent the vibration of the vertical members, each vertical member were connected to the adjacent members by making use of logs.
-Permanent repair
>The modification of connection detail was performed so that the stress transfers smoothly to the web plate of the tie girder ([[Fig.3>#fig3]]).
&br;
&br;
CENTER:&aname(fig3);&attachref(Mashit29.gif);&br;
&br;
CENTER:Fig.3 Retrofit work.&br;
&br;
&br;
終了行:
*Mashita Bridge [#i0a7d8c9]
**1.Field of application [#i599a773]
>Through-type Langer bridge on the roadway bridge, Japan.&br;
**2.Circumstances of Repair [#u882a38e]
>Fatigue cracks were found at the joint of the vertical member and the tie girder.
**3.Types of structure [#c0ce81ce]
>This bridge is the through-type Langer bridge of which arch span length is 66m ([[Fig.1>#fig1]]). The vertical members were H-type section and were weld connected to the top flange of the tie girders.
&br;
&br;
CENTER:&aname(fig1);&attachref(Mashit26.gif);&br;
&br;
CENTER:Fig.1 Through-type Langer bridge.&br;
**4.Details of loading [#z09b72b6]
>Fluctuating loads due to wind load.
**5.Description of damage [#id2681d9]
>Fatigue cracks occurred in the joint of the vertical member and tie girder ([[Fig.2>#fig2]]). The vertical members at the middle part of the bridge suffered the vibration due to wind of which speed was about 15 m/s. Cause of fatigue cracks is as follows. Vibration of the vertical members which was caused by Kerman's vortex.
&br;
&br;
CENTER:&aname(fig2);&attachref(Mashit27.gif);&br;
&br;
CENTER:&aname(fig2);&attachref(Mashit28.gif);&br;
&br;
CENTER:Fig.2 Crack which occurred in the joint of the vertical member and tie girder.&br;
&br;
&br;
**6.Repair method applied [#p649a511]
-Emergency repair
>Fracture part were pulled back by wire rope. To prevent the vibration of the vertical members, each vertical member were connected to the adjacent members by making use of logs.
-Permanent repair
>The modification of connection detail was performed so that the stress transfers smoothly to the web plate of the tie girder ([[Fig.3>#fig3]]).
&br;
&br;
CENTER:&aname(fig3);&attachref(Mashit29.gif);&br;
&br;
CENTER:Fig.3 Retrofit work.&br;
&br;
&br;
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