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송석준(Song Suk-Jun),구자갑(Koo Ja-Kap),김은겸(Kim Eun-Keum) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
The selected structure for the value engineering review is one section of cut and cover tunnel for Seoul Subway Line 9. The primary focus of the review is on the optimisation of the structures to save cost on the existing Line 9 contracts through variation of the design criteria as it affects the permanent works. This is to be achieved through comparison with design criteria for other selected international subways. Criteria resulting from the review must not compromise public safety and durability for the 100 year design life.
철도 PSC교량의 텐던 파단 감지를 위한 AE방법의 적용
최민석(Choi Min-Seok),윤석구(Youn Seok-Goo),김은겸(Kim Eun-Keum) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
A lot of PSC railway bridges have been constructed in countries and, they are considered as cost-effective and less maintenance-demanded structures. However, recently several collapse of PSC bridges happened in Europe show that PSC bridges have some serious maintenance problems related to tendon corrosion and wire fractures. Furthermore, any reliable NDT method is not presented until recently. In this paper, AE techniques are investigated for detection of wire fractures in PSC beam. Using long-term monitoring AE techniques, two acoustic signals of wire fractures in a PSC beam are obtained. These data are compared to other noise signals. Based on the test results, the characteristics of the AE signals are classified and wire fracture signals are figured out among the other AE signals. As a result, AE techniques are certainly exposed to tendon fracture sound, and application of AE techniques are better than any other non-destructive method.