Jhojuin Br. (connection plates between floor beams and truss chords)
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開始行:
* Jhojuin Br. (connection plates between floor beams and truss chords) [#a79af6db]
**1.Field of application [#d67aa7fc]
>Road bridge in Japan.&br;
**2.Circumstances of repair [#f169ca1c]
>Fatigue cracks at connection plates between floor beams and truss chords were found.&br;
**3.Types of structure [#xef8c103]
>The structure was a 2 span continuous deck truss, which had been in service for 22 years.&br;
CENTER:;&attachref(jhojui1.gif);&br;
&br;
CENTER:Fig.1 Location of experimental execution. &br;
**4.Details of loading [#b2f5f736]
>Fluctuating loads due to highway traffic.&br;
**5.Details of Fatigue Cracks [#r8692b6e]
>Fatigue cracks have occurred at the weld toe of the connection plates between the floor beams and main truss chord members. This type of crack has been found at almost all locations of the same details in the bridge. Average crack length is about 50 mm, ranges from 12 mm to 119 mm. Cracks have propagated through the weld metal of fillet welding.&br;
CENTER:;&attachref(jhojui2.gif);&br;
&br;
CENTER:Fig.2 Location of fatigue crack. &br;
**6.Probable Causes of Fatigue Cracks [#m13225cc]
>High stress concentration at the damaged portion induced by deflection of floor beams. Fixed end moment of floor beams which is designed as simple support beams.&br;
&br;
**7.Repair Procedures and The Effects [#k693fab9]
>Cracks were removed by air arc gouging and re-welded. The upper flange of the floor beam was connected to the upper flange of box section truss chord by welding the newly attached connection plate. Stress measurement was conducted before and after the repairing works and remarkable reduction of stress at the cracked location was confirmed.&br;
CENTER:;&attachref(jhojui3.gif);&br;
&br;
終了行:
* Jhojuin Br. (connection plates between floor beams and truss chords) [#a79af6db]
**1.Field of application [#d67aa7fc]
>Road bridge in Japan.&br;
**2.Circumstances of repair [#f169ca1c]
>Fatigue cracks at connection plates between floor beams and truss chords were found.&br;
**3.Types of structure [#xef8c103]
>The structure was a 2 span continuous deck truss, which had been in service for 22 years.&br;
CENTER:;&attachref(jhojui1.gif);&br;
&br;
CENTER:Fig.1 Location of experimental execution. &br;
**4.Details of loading [#b2f5f736]
>Fluctuating loads due to highway traffic.&br;
**5.Details of Fatigue Cracks [#r8692b6e]
>Fatigue cracks have occurred at the weld toe of the connection plates between the floor beams and main truss chord members. This type of crack has been found at almost all locations of the same details in the bridge. Average crack length is about 50 mm, ranges from 12 mm to 119 mm. Cracks have propagated through the weld metal of fillet welding.&br;
CENTER:;&attachref(jhojui2.gif);&br;
&br;
CENTER:Fig.2 Location of fatigue crack. &br;
**6.Probable Causes of Fatigue Cracks [#m13225cc]
>High stress concentration at the damaged portion induced by deflection of floor beams. Fixed end moment of floor beams which is designed as simple support beams.&br;
&br;
**7.Repair Procedures and The Effects [#k693fab9]
>Cracks were removed by air arc gouging and re-welded. The upper flange of the floor beam was connected to the upper flange of box section truss chord by welding the newly attached connection plate. Stress measurement was conducted before and after the repairing works and remarkable reduction of stress at the cracked location was confirmed.&br;
CENTER:;&attachref(jhojui3.gif);&br;
&br;
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