Steel Pier with circular section on The Metropolitan Expressway
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開始行:
*Steel Pier with circular section on The Metropolitan Expressway [#m7887210]
*首都高速道路の円形断面鋼製橋脚 [#m7887210]
**1.Field of application [#i46ac147]
>Steel pier at The 5th line on The Metropolitan Expressway, Japan.&br;
>首都高速道路5号線の鋼製橋脚
**2.Circumstances of Repair [#j8c7ddc6]
>Fatigue cracks were found in welded joints ,which were the corner of the steel bridge pier,in 2003 after 35 years of service .
>供用開始から35年経過した2003年、鋼製橋脚隅角部の溶接継手に疲労き裂が見つかった。
**3.Types of structure [#o5156f4d]
>Front view of the steel pier is shown in [[Fig.1>#fig1]].
>[[図.1>#fig1]]に鋼製橋脚の正面図を示す。
-Structural steel : SM50B,SM58
&br;
-使用鋼材：SM50B、SM58
&br;
CENTER:&aname(fig1);&attachref(./steel_pier_circular_1.jpg,30%);&br;
&br;
CENTER:Fig.1 Front of the steel piers
&br;
CENTER:図.1 正面図
&br;
**4.Details of loading [#z3320972]
>Fluctuating loads due to highway live load.
>活荷重
**5.Description of damage [#w809f60e]
>Many cracks which lengths were more than 30mm were observed.The location of the cracks is shown in [[Fig.2>#fig2]].The detail of the crack is shown in [[Fig.3>#fig3]].
&br;
>長さが30mmを超える疲労き裂が数多く見つかった。[[図.2>#fig2]]に疲労き裂の位置を示す。[[図.3>#fig3]]にき裂の詳細を示す。
&br;
CENTER:&aname(fig2);&attachref(./steel_pier_circular_2.jpg,10%);&br;
&br;
CENTER:Fig.2 The location of the cracks
&br;
CENTER:図.2 疲労き裂の位置
&br;
CENTER:&aname(fig3);&attachref(./steel_pier_circular_3.jpg,10%);&br;
&br;
CENTER:Fig.3 The detail of the crack
&br;
CENTER:図.3 疲労き裂の詳細
&br;
>Cause of fatigue cracks was as follows:
>疲労き裂の原因は次のとおりである。
-The cause of the cracks was the lack of fusions in the welded joints which were at the corner of the steel pier([[Fig.4>#fig4]]).
&br;
-鋼製橋脚隅角部の溶接継手における溶け込み不足
&br;
CENTER:&aname(fig4);&attachref(./steel_pier_circular_4.jpg,20%);&br;
&br;
CENTER:Fig.4 Lack of fusion in the welded joints.
&br;
CENTER:図.4 溶接部の溶け込み不足
&br;
**6.Repair method applied [#xcafab0b]
>The principles of the repair were as follows.
>補修の方針は以下のとおりである。
-Halving the fluctuating stress by installing a reinforcement member.
-Preventing the development of the cracks by cutting.
-補強部材を設置することで発生応力度を半減させる。
-カッティングにより、き裂の進展を抑制する。
>The reinforcement member is shown in [[Fig.5>#fig5]]. And the circumstances of cutting is shown in [[Fig.6>#fig6]].
>[[図.5>#fig5]]に補強部材を示す。また、カッティングの状況を [[図.6>#fig6]]に示す.
&br;
CENTER:&aname(fig5);&attachref(./steel_pier_circular_5.jpg,30%);&br;
&br;
CENTER:Fig.5 Reinforcement member.
&br;
CENTER:図.5 補強部材
&br;
CENTER:&aname(fig6);&attachref(./steel_pier_circular_6.jpg,20%);&br;
&br;
CENTER:Fig.6 Circumstanses of cutting
&br;
CENTER:図.6 カッティングの状況
&br;
**Reference [#g9d0ce04]
>Kurokawa et al,A repair case of fatigue damage which occurred at a corner of a steel pier with circular section ,'''Prc.of Annual Conferenece of JSCE''',vol.58,2003.(In Japanese)
終了行:
*Steel Pier with circular section on The Metropolitan Expressway [#m7887210]
*首都高速道路の円形断面鋼製橋脚 [#m7887210]
**1.Field of application [#i46ac147]
>Steel pier at The 5th line on The Metropolitan Expressway, Japan.&br;
>首都高速道路5号線の鋼製橋脚
**2.Circumstances of Repair [#j8c7ddc6]
>Fatigue cracks were found in welded joints ,which were the corner of the steel bridge pier,in 2003 after 35 years of service .
>供用開始から35年経過した2003年、鋼製橋脚隅角部の溶接継手に疲労き裂が見つかった。
**3.Types of structure [#o5156f4d]
>Front view of the steel pier is shown in [[Fig.1>#fig1]].
>[[図.1>#fig1]]に鋼製橋脚の正面図を示す。
-Structural steel : SM50B,SM58
&br;
-使用鋼材：SM50B、SM58
&br;
CENTER:&aname(fig1);&attachref(./steel_pier_circular_1.jpg,30%);&br;
&br;
CENTER:Fig.1 Front of the steel piers
&br;
CENTER:図.1 正面図
&br;
**4.Details of loading [#z3320972]
>Fluctuating loads due to highway live load.
>活荷重
**5.Description of damage [#w809f60e]
>Many cracks which lengths were more than 30mm were observed.The location of the cracks is shown in [[Fig.2>#fig2]].The detail of the crack is shown in [[Fig.3>#fig3]].
&br;
>長さが30mmを超える疲労き裂が数多く見つかった。[[図.2>#fig2]]に疲労き裂の位置を示す。[[図.3>#fig3]]にき裂の詳細を示す。
&br;
CENTER:&aname(fig2);&attachref(./steel_pier_circular_2.jpg,10%);&br;
&br;
CENTER:Fig.2 The location of the cracks
&br;
CENTER:図.2 疲労き裂の位置
&br;
CENTER:&aname(fig3);&attachref(./steel_pier_circular_3.jpg,10%);&br;
&br;
CENTER:Fig.3 The detail of the crack
&br;
CENTER:図.3 疲労き裂の詳細
&br;
>Cause of fatigue cracks was as follows:
>疲労き裂の原因は次のとおりである。
-The cause of the cracks was the lack of fusions in the welded joints which were at the corner of the steel pier([[Fig.4>#fig4]]).
&br;
-鋼製橋脚隅角部の溶接継手における溶け込み不足
&br;
CENTER:&aname(fig4);&attachref(./steel_pier_circular_4.jpg,20%);&br;
&br;
CENTER:Fig.4 Lack of fusion in the welded joints.
&br;
CENTER:図.4 溶接部の溶け込み不足
&br;
**6.Repair method applied [#xcafab0b]
>The principles of the repair were as follows.
>補修の方針は以下のとおりである。
-Halving the fluctuating stress by installing a reinforcement member.
-Preventing the development of the cracks by cutting.
-補強部材を設置することで発生応力度を半減させる。
-カッティングにより、き裂の進展を抑制する。
>The reinforcement member is shown in [[Fig.5>#fig5]]. And the circumstances of cutting is shown in [[Fig.6>#fig6]].
>[[図.5>#fig5]]に補強部材を示す。また、カッティングの状況を [[図.6>#fig6]]に示す.
&br;
CENTER:&aname(fig5);&attachref(./steel_pier_circular_5.jpg,30%);&br;
&br;
CENTER:Fig.5 Reinforcement member.
&br;
CENTER:図.5 補強部材
&br;
CENTER:&aname(fig6);&attachref(./steel_pier_circular_6.jpg,20%);&br;
&br;
CENTER:Fig.6 Circumstanses of cutting
&br;
CENTER:図.6 カッティングの状況
&br;
**Reference [#g9d0ce04]
>Kurokawa et al,A repair case of fatigue damage which occurred at a corner of a steel pier with circular section ,'''Prc.of Annual Conferenece of JSCE''',vol.58,2003.(In Japanese)
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