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#article **bTcKawkCglHzsz [#h9bafc89] >[[gordon]] (2015-04-13 (Mon) 07:00:37)~ ~ imVpIC http://www.FyLitCl7Pf7kjQdDUOLQOuaxTXbj5iNG.com~ // #comment #comment **Sample [#sac3a3e1] >[[Sample]] (2014-03-20 (Thu) 05:40:08)~ ~ 1. Field of application~ ~ Steel pier at the third line of The Metropolitan Expressway, Japan.~ ~ 2. Circumstance of repair~ ~ Fatigue cracks were found in welded joints ,which were at the corner of the steel bridge pier,in 1997.~ ~ 3. Types of structure~ ~ >Front views of the steel piers are shown in [[Fig.1>#fig1]].~ &aname(fig1);&attachref(./pier_shutoko_1.jpg,20%);&br;~ Fig.1 Front of the steel piers~ ~ 4. Details of loading~ ~ Fluctuating loads due to highway live load. ~ ~ 5. Description of damage~ ~ >One of these fatigue cracks location and detail are shown in [[Fig.2>#fig2]].~ &aname(fig2);&attachref(./pier_shutoko_2.jpg,20%);&br;~ Fig.2 One of these fatigue cracks location and detail~ ~ Causes of fatigue cracks were as follows:~ ・Lack of fusion in the double bevel groove type welded joint which connected the transverse beam flange to the colum flange.~ ・Large cyclic stress due to live load.~ ~ 6. Repair method applied~ ~ As the temporally-repair,bolted splice plates were installed on the box webs of the connections.This repairing decreased the measured stress by about 50%,so that these piers could be used safely temporally.But it was needed to remove all the fatigue cracks as the final repair.~ ~ &aname(fi3);&attachref(./pier_shutoko_3.jpg,20%);&br;~ Fig.3 Bolted splice plates~ &aname(fi4);&attachref(./pier_shutoko_4.jpg,40%);&br;~ Fig.4 Construction photograph of bolted splice plates~ ~ Reference~ Hisashi MORIKAWA,Tetsuhiro SHIMOZATO,Chitoshi MIKI and Atsushi ICHIKAWA,STUDY ON FATIGUE CRACKING IN STEEL BRIDGE PIERS WITH BOX SECTION AND TEMPORALLY REPAIRING,'''Journal of JSCE''',No.703/I-59,pp177-183,2002.4(In Japanese)~ // #comment
