Yamazoe Bridge
をテンプレートにして作成
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開始行:
*Yamazoe Bridge [#tff57788]
*山添橋[#tff57788]
**1.Field of application [#c1fabd1c]
>Yamazoe Bridge of Route 25 in Nara, Japan.&br;
>山添橋（国道25号 奈良県）
**2.Circumstances of Repair [#a5bd88f4]
>Fatigue crack was found at the web panel of the main girder in Oct.2006 after 35 years of service.
>供用開始から35年が経過した2006年10月、主桁WEBに疲労き裂が見つかった。
**3.Types of structure [#a444ffbb]
>The outline of the bridge structure is as follows.
>橋梁の構造諸元は次のとおりである。
-Bridge length : 128.02 m
-Span length : unknown
-Structure : Three spans continuous noncomposite plate girder
-Structural steel : unknown
-橋長：128.02m
-支間長：不明
-橋梁形式：3径間連続鈑桁橋
-使用鋼材：不明
>Photograph of Yamazoe Bridge is shown in [[Fig.1>#fig1]]. Elevation and cross section are shown in [[Fig.2>#fig1]].Red circle in Fig.1 shows the location of the crack.
>[[図.1>#fig1]]に山添橋の写真を示す。また、[[図.2>#fig1]]に側面図と断面図を示すが、赤丸の部分が疲労き裂の発生位置である。
CENTER:&aname(fig1);&attachref(./yamazoe_1.jpg,30%);
&br;
CENTER:Fig.1 Yamazoe Bridge.
&br;
CENTER:図.1 山添橋
&br;
CENTER:&aname(fig2);&attachref(./yamazoe_2.jpg,30%);
&br;
CENTER:Fig.2 Elevation and cross section.
&br;
CENTER:図.2 側面図と断面図
&br;
**4.Details of loading [#c85f6e55]
>Fluctuating loads due to vehicles live load. 57099 vehicles / 24hr.
>活荷重（57099台/日）
**5.Description of damage [#gf6117df]
>The crack detail is shown in [[Fig.3>#fig3]].The detail of the structure where the crack was generated is as follows.The lower flange of the cross beam penetrated the slit of the web panel of the main girder.And only upper side of the flange was joined to the web panel of the main girder by welding.
>[[図.3>#fig3]]に疲労き裂の詳細を示す。疲労き裂の発生位置は、主桁WEBに設けられた横桁下フランジ用の貫通スリット近傍である。スリット部では横桁下フランジの上側だけが主桁WEBと溶接されていた。
>The following things are assumed by the aspect of this crack. At first, the fatigue crack was generated from the vicinity of the toe of the boxing welding which joined the flange of the cross beam to the web of the main girder. Next, after the fatigue crack propagated for about 100mm, the brittle fracture occurred.
&br;
>疲労き裂の発生状況から、最初、疲労き裂は横桁下フランジと主桁WEBのまわし溶接部の近傍に生じ、その後き裂長が100mm程度に達したのち、脆性的にき裂が進展したものと推定される。
&br;
CENTER:&aname(fig3);&attachref(./yamazoe_3.jpg,30%);&br;
&br;
CENTER:Fig.3 Crack detail.
&br;
CENTER:図.3 き裂の詳細
&br;
>Cause of fatigue cracks was as follows:&br;
>疲労き裂の原因は以下のとおりである:&br;
-Detail of the weld joint indicating the low fatigue strength.
-疲労強度が著しく低い溶接継手が使われていた。
**6.Repair method applied [#la34efa0]
>Bolted splice plates were installed on the web of the main girder([[Fig.4>#fig4]]).
&br;
>主桁WEBに当て板補強を行った([[図.4>#fig4]]).
CENTER:&aname(fig4);&attachref(./yamazoe_4.jpg,30%);&br;
&br;
CENTER:Fig.4 Bolted splice plate
&br;
CENTER:図.4 当て板補強
&br;
**Reference [#ief6a229]
>Chitoshi Miki,Fatigue and destruction of bridge,2011.10(In Japanese)
&br;
終了行:
*Yamazoe Bridge [#tff57788]
*山添橋[#tff57788]
**1.Field of application [#c1fabd1c]
>Yamazoe Bridge of Route 25 in Nara, Japan.&br;
>山添橋（国道25号 奈良県）
**2.Circumstances of Repair [#a5bd88f4]
>Fatigue crack was found at the web panel of the main girder in Oct.2006 after 35 years of service.
>供用開始から35年が経過した2006年10月、主桁WEBに疲労き裂が見つかった。
**3.Types of structure [#a444ffbb]
>The outline of the bridge structure is as follows.
>橋梁の構造諸元は次のとおりである。
-Bridge length : 128.02 m
-Span length : unknown
-Structure : Three spans continuous noncomposite plate girder
-Structural steel : unknown
-橋長：128.02m
-支間長：不明
-橋梁形式：3径間連続鈑桁橋
-使用鋼材：不明
>Photograph of Yamazoe Bridge is shown in [[Fig.1>#fig1]]. Elevation and cross section are shown in [[Fig.2>#fig1]].Red circle in Fig.1 shows the location of the crack.
>[[図.1>#fig1]]に山添橋の写真を示す。また、[[図.2>#fig1]]に側面図と断面図を示すが、赤丸の部分が疲労き裂の発生位置である。
CENTER:&aname(fig1);&attachref(./yamazoe_1.jpg,30%);
&br;
CENTER:Fig.1 Yamazoe Bridge.
&br;
CENTER:図.1 山添橋
&br;
CENTER:&aname(fig2);&attachref(./yamazoe_2.jpg,30%);
&br;
CENTER:Fig.2 Elevation and cross section.
&br;
CENTER:図.2 側面図と断面図
&br;
**4.Details of loading [#c85f6e55]
>Fluctuating loads due to vehicles live load. 57099 vehicles / 24hr.
>活荷重（57099台/日）
**5.Description of damage [#gf6117df]
>The crack detail is shown in [[Fig.3>#fig3]].The detail of the structure where the crack was generated is as follows.The lower flange of the cross beam penetrated the slit of the web panel of the main girder.And only upper side of the flange was joined to the web panel of the main girder by welding.
>[[図.3>#fig3]]に疲労き裂の詳細を示す。疲労き裂の発生位置は、主桁WEBに設けられた横桁下フランジ用の貫通スリット近傍である。スリット部では横桁下フランジの上側だけが主桁WEBと溶接されていた。
>The following things are assumed by the aspect of this crack. At first, the fatigue crack was generated from the vicinity of the toe of the boxing welding which joined the flange of the cross beam to the web of the main girder. Next, after the fatigue crack propagated for about 100mm, the brittle fracture occurred.
&br;
>疲労き裂の発生状況から、最初、疲労き裂は横桁下フランジと主桁WEBのまわし溶接部の近傍に生じ、その後き裂長が100mm程度に達したのち、脆性的にき裂が進展したものと推定される。
&br;
CENTER:&aname(fig3);&attachref(./yamazoe_3.jpg,30%);&br;
&br;
CENTER:Fig.3 Crack detail.
&br;
CENTER:図.3 き裂の詳細
&br;
>Cause of fatigue cracks was as follows:&br;
>疲労き裂の原因は以下のとおりである:&br;
-Detail of the weld joint indicating the low fatigue strength.
-疲労強度が著しく低い溶接継手が使われていた。
**6.Repair method applied [#la34efa0]
>Bolted splice plates were installed on the web of the main girder([[Fig.4>#fig4]]).
&br;
>主桁WEBに当て板補強を行った([[図.4>#fig4]]).
CENTER:&aname(fig4);&attachref(./yamazoe_4.jpg,30%);&br;
&br;
CENTER:Fig.4 Bolted splice plate
&br;
CENTER:図.4 当て板補強
&br;
**Reference [#ief6a229]
>Chitoshi Miki,Fatigue and destruction of bridge,2011.10(In Japanese)
&br;
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