Principles of Structural Design Essay Example | Topics and Well Written Essays - 3750 words

Principles of Structural Design - Essay ExampleAnalysis of a structural collapse involves the study of the basic architectural principles, properties and operation of the different components of the structure, as well as knowledge of different possible causes of structural failure.The Seongsu Bridge is 11th bridge constructed over the Han River in capital of South Korea, South Korea. Construction of this jut bridge was set about on April 9, 1977 and completed on October 15, 1979, 2 years and 6 months later. It was a four-lane bridge with 19.4m width and 1,160.8m length 20.It became notorious when it collapsed on October 21, 1994. The bridge collapsed early in the morning when one of its concrete slabs fell in to river due to a failure of the suspension structure. Around 0740 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 di ed and 17 people were injured while they were on the way to office or school.Seongsu Bridge is one part of arterial road that connects the Kanan district which is residential section in the southern in Seoul City and city circle around of Seoul City, and its has a lot of traffic volume. The stigma truss digit division where the accident occurred was the 672m length, and it was one of the suspension digits of the center part. ... In addition, Seongsu Bridge complained that it had been trembling in motion, so the authorities in Seoul City also carried out the repair work of the emergency in the night in accident the previous day. It was said that the traffic jam arose, because especially, it was for commutation attending school hour in the accident-generation, and because the rain fell, the rolling germinate was crowded 20.Cause of collapseVarious reasons can be associated with the collapse of bridge. Major of them are as listed below 19Bad welding of the suspension which constitu ent of the I-type cross section, which was hanging the suspension digit of the center from the steel truss, seems to be a main cause. There was visibility cutting corners between surface and get married plate of the fillet welding, so construction management and inspection method in the construction of Seongsu Bridge seemed to be remarkably slipshod. Calcium chloride, which was scattered in order to prevent the road surface freezing, chloride ingress was uppued for the cracks by poor weld or stress corrosion, and so that the corrosion of steel product office be promoted. There is a possibility to produce unexpected partial cracks in the steel surface because in the cross-sectional shape of suspension steel product, the cone angle ( the relaxation curved surface ) for easing stress concentration was insufficient. Though in that location is no error at the content for the design, there was some possibility that the immature construction level was not sufficiently assumed. There wer e no technical standards on in-service maintenance repair of Seongsu Bridge. Because of the fiscal option constraint (budget) of Seongsu Bridge while it was in service, the periodic check was