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Typhoon RUSA
Collapse of Sampoong
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Typhoon Maemi
Collapse of Seongsu
Fire in Daegu Subway
Fire in Sea Land
When: At 07:40 hours on October 21, 1994
Damage of lives: 49 (32 deaths and 17 wounded)
Outline of the accident

Around 07:40 hours on October 21, 1994, Seongsu Bridge connecting Seongsu-dong and Apgujeong-dong of Gangnam-gu, Seoul, collapsed. The slab (48 m) between the fifth and the sixth leg of the Bridge collapsed so 32 people died and 17 people were injured while they were on the way to office or school.

Seongsu Bridge is the 11th bridge constructed over Han River. Its construction was set about on April 9, 1977 and completed on October 15, 1979, 2 years and 6 months later. It is four-lane bridge with 19.4m width and 1,160.8m length.

Dongah Construction worked on its construction, spending 11.58 billion. Unlike the existing bridges oriented in functions, it employed Gerber Truss engineering in consideration of beauty.
Through investigation, it was found that: joints of trusses (steel structures) supporting the bridge slab were not welded to the full; the welding thickness, which should be over 10mm, was only 8mm; and further, connecting pins for steel bolts were poor.
From April 26, 1995, Hyundai Construction set about the construction to recover the bridge with 78 billion, and on July 3, 1997, 2 years and 8 months later after the accident happened, passage of vehicles was commenced again.
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