Steel bridge on Hanshin Expressway (at floor-beam end)
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開始行:
*Steel bridge on Hanshin Expressway (at floor-beam end) [#c200ca35]
**1.Field of application [#n534b287]
>Steel bridge, opened in 1970, on Kobe line of Hanshin Expressway, Japan.&br;
**2.Circumstances of Repair [#g1e4a80c]
>Fatigue crack was found in the weld toe of the floorbeam bottom flange at the floorbeam-girder connection.
**3.Types of structure [#c6cc3fa3]
>Simple composite plate girders bridge. The floorbeams were weld connected to the girder webs. Web gaps between the floorbeam bottom flanges and girder bottom flanges existed ([[Fig.1>#fig1]]).&br;
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CENTER:&aname(fig1);&attachref(Hanko18.gif);&br;
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CENTER:Fig.1 Cracked girder view.&br;
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**4.Details of loading [#y65ff45b]
>Fluctuating loads due to highway live load.
**5.Description of damage [#veed4c5a]
>Fatigue crack occurred in the weld toe of the floorbeam bottom flange at the floorbeam-girder connection ([[Fig.2>#fig2]]). The crack propagated vertical to girder web. Cause of fatigue crack was thought as follows. Stress concentration at the lower part of the girder-floorbeam connection due to the stress combination between out-of-plane distortion, which was caused by the floorbeam action, and principle stress by the girder action.&br;
&br;
&br;
CENTER:&aname(fig2);&attachref(Hanko19.gif);&br;
&br;
CENTER:Fig.2 Crack which occurred in the weld toe of the floorbeam bottom flange at the floorbeam-girder connection.&br;
&br;
&br;
**6.Repair method applied [#j2c2f301]
>Trial retrofit and stress measurement in the field indicated that splicing by high strength bolts had the beneficial effects ([[Fig.3>#fig3]]).&br;
&br;
&br;
CENTER:&aname(fig3);&attachref(Hanko110.gif);&br;
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CENTER:Fig.3 Bolt splice.&br;
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終了行:
*Steel bridge on Hanshin Expressway (at floor-beam end) [#c200ca35]
**1.Field of application [#n534b287]
>Steel bridge, opened in 1970, on Kobe line of Hanshin Expressway, Japan.&br;
**2.Circumstances of Repair [#g1e4a80c]
>Fatigue crack was found in the weld toe of the floorbeam bottom flange at the floorbeam-girder connection.
**3.Types of structure [#c6cc3fa3]
>Simple composite plate girders bridge. The floorbeams were weld connected to the girder webs. Web gaps between the floorbeam bottom flanges and girder bottom flanges existed ([[Fig.1>#fig1]]).&br;
&br;
&br;
CENTER:&aname(fig1);&attachref(Hanko18.gif);&br;
&br;
CENTER:Fig.1 Cracked girder view.&br;
&br;
&br;
**4.Details of loading [#y65ff45b]
>Fluctuating loads due to highway live load.
**5.Description of damage [#veed4c5a]
>Fatigue crack occurred in the weld toe of the floorbeam bottom flange at the floorbeam-girder connection ([[Fig.2>#fig2]]). The crack propagated vertical to girder web. Cause of fatigue crack was thought as follows. Stress concentration at the lower part of the girder-floorbeam connection due to the stress combination between out-of-plane distortion, which was caused by the floorbeam action, and principle stress by the girder action.&br;
&br;
&br;
CENTER:&aname(fig2);&attachref(Hanko19.gif);&br;
&br;
CENTER:Fig.2 Crack which occurred in the weld toe of the floorbeam bottom flange at the floorbeam-girder connection.&br;
&br;
&br;
**6.Repair method applied [#j2c2f301]
>Trial retrofit and stress measurement in the field indicated that splicing by high strength bolts had the beneficial effects ([[Fig.3>#fig3]]).&br;
&br;
&br;
CENTER:&aname(fig3);&attachref(Hanko110.gif);&br;
&br;
CENTER:Fig.3 Bolt splice.&br;
&br;
&br;
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