Steel bridge on roadway bridge(intersection of bulb ribs and crossbeems)
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開始行:
*Steel bridge on roadway bridge (intersection of bulb ribs and transverse ribs ) [#df6dee96]
**1.Field of application [#t9f10040]
>Steel bridge of Route 43, Japan.&br;
**2.Circumstances of repair [#u51eb814]
>Fatigue cracks at intersection of bulb ribs and transverse ribs were found.
**3.Types of structure [#u3ec78ba]
>The outline of the bridge structure is as follows.&br;
-Bridge length : 211.0m
-Span length : 60.0m+91.0m+60.0m
-Structure : Box girder bridge with orthotropic deck system
**4.Details of loading [#haefc2a0]
>Fluctuating loads due to vehicles live load.
**5.Description of damage [#b6e63298]
>Fatigue cracks were detected on boxing weld joints between bottom of bulb ribs and web plates of transverse ribs .Cracks initiated from the toe of the boxing weld joints and propagated at the web plates of the transverse ribs ([[Fig.1>#fig1]]).
&br;
CENTER:&aname(fig1);&attachref(./bulb_crack.jpg,100%);&br;
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CENTER:Fig.1 Crack location &br;
&br;
>Cause of fatigue cracks was as follows:&br;
-Localized stress concentration which resulted from the restraint of the deck plate deflection due to the wheel load.
**6.Repair method applied [#c47374bb]
>Retrofitting measures were cutting treating of semicircle at the vertical stiffeners([[Fig.2>#fig2]]).
&br;
&br;
CENTER:&aname(fig2);&attachref(./cutting.jpg,50%);&br;
&br;
CENTER:Fig.2 Cutting treating of semicircle &br;
&br;
**Reference [#jdd5feb9]
>Yoshihiko TAKADA,Yoriko KAWAKAMI,Yuji SAKAI,Masahiro SAKANO, Study on retrofit measures in weld of vertical stiffener cutting treating of the semicircle in orthotropic steel deck, '''STEEL CONSTRUCTION ENGINEERING''', Vol.16, No.62,2009.(In Japanese)
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&br;
終了行:
*Steel bridge on roadway bridge (intersection of bulb ribs and transverse ribs ) [#df6dee96]
**1.Field of application [#t9f10040]
>Steel bridge of Route 43, Japan.&br;
**2.Circumstances of repair [#u51eb814]
>Fatigue cracks at intersection of bulb ribs and transverse ribs were found.
**3.Types of structure [#u3ec78ba]
>The outline of the bridge structure is as follows.&br;
-Bridge length : 211.0m
-Span length : 60.0m+91.0m+60.0m
-Structure : Box girder bridge with orthotropic deck system
**4.Details of loading [#haefc2a0]
>Fluctuating loads due to vehicles live load.
**5.Description of damage [#b6e63298]
>Fatigue cracks were detected on boxing weld joints between bottom of bulb ribs and web plates of transverse ribs .Cracks initiated from the toe of the boxing weld joints and propagated at the web plates of the transverse ribs ([[Fig.1>#fig1]]).
&br;
CENTER:&aname(fig1);&attachref(./bulb_crack.jpg,100%);&br;
&br;
CENTER:Fig.1 Crack location &br;
&br;
>Cause of fatigue cracks was as follows:&br;
-Localized stress concentration which resulted from the restraint of the deck plate deflection due to the wheel load.
**6.Repair method applied [#c47374bb]
>Retrofitting measures were cutting treating of semicircle at the vertical stiffeners([[Fig.2>#fig2]]).
&br;
&br;
CENTER:&aname(fig2);&attachref(./cutting.jpg,50%);&br;
&br;
CENTER:Fig.2 Cutting treating of semicircle &br;
&br;
**Reference [#jdd5feb9]
>Yoshihiko TAKADA,Yoriko KAWAKAMI,Yuji SAKAI,Masahiro SAKANO, Study on retrofit measures in weld of vertical stiffener cutting treating of the semicircle in orthotropic steel deck, '''STEEL CONSTRUCTION ENGINEERING''', Vol.16, No.62,2009.(In Japanese)
&br;
&br;
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