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bridge into the channel. The new design of the bridge hastened the bridge's collapse, but did not actually cause the fatal weakening of the
Babeldoab flange. The cause of collapse remains unknown though it was studied in some detail by professional firms and researchers. The repair and resurfacing operation may have contributed to the bridge failure, but since the lawsuit over the collapse was settled out of court, no final cause has ever been definitively published.
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The most probable progression of the collapse began with a weakening of the
Babeldaob side. This caused a shear failure, resulting in all of the weight of the continuous main span coming to rest on the Koror side. This unbalanced moment caused the back span of the Koror side to fail and tipped the
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had caused the midline of the bridge to sag 1.2 meters, causing discomfort to drivers and concern for officials. The Palau government commissioned two studies by Louis Berger
International and Japan International Co-operation Agency. They both concluded that the bridge was structurally safe as of
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After having reinforcement work done, the bridge suddenly collapsed at approximately 17:35 on 26 September 1996 and shut off fresh water and electricity between the islands. In addition, the collapse killed two people and injured four more. This caused the government to declare a
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international Co-operation Agency in 1990. They concluded that the bridge was "safe" as of now (in 100 year increments it will cave in 90 cm) and the large deflections were due to creep and the modulus of elasticity of the concrete in place being lower than anticipated.
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and Alfred A. Yee and
Associates. It was constructed by Dyckerhoff & Widmann AG, contractor was Palau based Korean company, Socio Construction Co. It was the world's largest bridge of its type, until its record was broken by the 260 m span of the Gateway Bridge in
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international Co-operation Agency) of bridge engineers had evaluated the bridge and declared it safe, and less than three months after completion of a strengthening programme to correct a significant midspan sag that was continuing to worsen.
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The 18-year-old, Koror-Babeldaob bridge (KB bridge) collapsed abruptly and catastrophically. The failure occurred during benign weather and loading conditions, six years after two independent teams (Louis Berger
International and the
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1990 though 1m more of creep would occur in the future. Based on the studies, the Palau government decided to counteract the cosmetic damage caused by creep with resurfacing and reinforcement of the bridge.
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As the Palau government lacked sufficient funds to rebuild immediately, a new bridge to provide a steady transportation system was constructed with significant
Japanese Grant Aid in
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The middle hinge point of the bridge began to noticeably sag in the middle 10 years after its completion. This led to two studies carried out by Louis Berger
International and the
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of 240.8 m and total length of 385.6 m (1265 ft). In addition to carrying traffic, it also carried piping and conduits for fresh water and electricity. It was designed by
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construction company, and was completed in
December, 2001. It was named "Japan-Palau Friendship Bridge" on its opening ceremony on January 11, 2002.
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275:...Welcome to Socio's website. Socio is a construction and engineering firm located in Koror, Palau and operated under Surangel and Sons Co.
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According to
British civil engineers Chris Burgoyne and Richard Scantlebury, the reinforcement operation had 4 main components.
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The bridge midspan was modified, changing the originally non-weight-bearing hinged joint to a continuous block of concrete.
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Eight flat-jacks were added to the center of the structure to add additional prestress, loading the center of the bridge.
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Troyano, L.F., "Bridge
Engineering: A Global Perspective", Thomas Telford Publishing, 2003, p.426
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The Collapse of the K-B Bridge in 1996 A MSc Dissertation at the Imperial College London
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Matthias Pilz, Institut für Massivbau und Baustofftechnologie, Universität Leipzig
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Pontoon Type (Floating Structure with Flat Plates) bridge, Palau History; page 1
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in 2002, to replace the former bridge built by Socio Construction Co. of
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The preserved slate of the former Koror-Babeldaob Bridge; January 2011.
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Burgoyne, C. Scantlebury, R. (2006) "Why did Palau Bridge Collapse?"
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The bridge was resurfaced to smooth out the sagging road.
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Eight prestress cables were added to straighten the span.
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and English which is recessed at the former KB Bridge.
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provided emergency aid as well as a temporary bridge.
286:"Locate and HeadQuarter of Surangel and Sons Company"
74:with a total length of 413 m. It was built by the
417:"Koror-Babeldaob Bridge | Koror | Projects | WJE"
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405:http://www-civ.eng.cam.ac.uk/cjb/papers/p56.pdf
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102:The original Koror–Babeldaob Bridge was a
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178:Original Koror-Babeldaob Bridge collapse
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351:The Collapse of the K-B Bridge in 1996
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182:By 1990, a physical phenomenon called
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469:- Research of the KB Bridge collapse
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814:Buildings and structures in Koror
799:Bridge disasters of unknown cause
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467:Cambridge Univ. Research Projects
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86:in 1978 which collapsed in 1996.
42:Map of the Koror-Babeldaob bridge
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382:Picture of the temporary bridge
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372:Britannica Online Encyclopedia
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716:Ngarachamayong Culture Center
456:Koror-Babeldaob Bridge (1978)
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220:Japan Palau Friendship Bridge
212:Japan-Palau Friendship Bridge
829:2002 establishments in Palau
653:Cities, towns & villages
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675:Southwest Islanders Village
607:Bodies of water & reefs
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118:Dyckerhoff & Widmann AG
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804:Bridges completed in 2002
794:Bridge disasters in Palau
789:Bridges completed in 1977
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684:Buildings and structures
246:List of bridge failures
161:Reason for the collapse
701:Koror–Babeldaob Bridge
434:Palau History; page 10
310:A picture of the plate
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153:and foreign minister,
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48:Koror–Babeldaob Bridge
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18:Koror-Babeldaob Bridge
834:Japan–Palau relations
765:7.36204°N 134.50424°E
691:Belau National Museum
473:Pacific Island Report
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149:, then the country's
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731:Palau Public Library
639:Uet era Ngermeuangel
481:Matthias Pilz report
129:, finished in 1985.
107:prestressed concrete
90:The former KB Bridge
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327:Structurae database
104:balanced cantilever
72:cable-stayed bridge
64:reinforced concrete
809:Box girder bridges
770:7.36204; 134.50424
387:2007-11-14 at the
356:2007-09-26 at the
270:2012-03-01 at the
230:Kajima Corporation
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62:Islands. It is a
16:(Redirected from
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294:. Retrieved
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112:with a main
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68:portal frame
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768: /
756:134°30′15″E
614:Blue Corner
577:Ngeruktabel
562:Bablomekang
84:South Korea
783:Categories
706:Koror Jail
619:Clear Lake
572:Ngerukewid
461:Structurae
296:2009-12-28
252:References
753:7°21′43″N
629:Goby Lake
151:President
127:Australia
60:Babeldaob
567:Eil Malk
529:Governor
385:Archived
354:Archived
268:Archived
240:See also
234:Japanese
123:Brisbane
670:Ngermid
547:Malakal
540:Islands
665:Meyuns
582:Ongael
533:Ibedul
314:Hangul
824:Airai
660:Koror
587:Ulong
516:Koror
184:creep
168:Japan
155:Japan
134:Japan
80:Japan
56:Koror
52:Palau
525:Flag
232:, a
114:span
58:and
46:The
458:at
312:in
226:ODA
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20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
