DOI QR코드

DOI QR Code

Structural Safety Evaluation of Cable Stayed Bridge based on Cable Damage Scenarios

사장교 케이블 손상 사나리오에 따른 구조 안전 수준 평가

  • Kim, Ga Young (Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Seo, Dong-Woo (Korea Institute of Civil Engineering and Building Technology (KICT))
  • Received : 2018.05.02
  • Accepted : 2018.07.06
  • Published : 2018.07.31

Abstract

This study aims to evaluate the safety for cable stayed bridge due to damages on the cable system. Many cable supported bridges, including cable stayed bridge and suspension bridge, have been built in the Korean peninsula. This requires efficient maintenance and management since this structure has complex structural components and system. This large structure also often faces risks either from manmade or natural phenomenon. In 2015 one cable-stayed bridge in South Korea had been struck by a bolt of lightning on the cables. This event had led to fire on cables. These cables had been damaged and putting the bridge at risk. This bridge was back in used after a few weeks of investigations and replacements of the cables. However, enormous social and economic expense were paid for recovery. After this event risk based management for infra structures is required by public demands. Therefore, this study was initiated and aimed to evaluate risks on the cable system due to potential damages. In this paper one cable-stayed bridge in South Korea was selected and investigated its safety based on the damage scenarios of cable system for efficient and prompt management, and for supporting decision making. FEM analysis was conducted to evaluate the safety of the bridges due to damages on the cable system.

본 연구는 케이블 시스템의 손상으로 인한 케이블지지 교량의 안전 수준을 평가하여 재난 관리의 활용을 목적으로 한다. 국내에 다양한 형태의 케이블지지 교량(현수교 및 사장교)이 건설되었다. 이러한 교량은 복잡한 구조 요소와 시스템을 가지고 있기 때문에 효율적인 유지 관리가 필요하다. 케이블지지 교량은 종종 인적 또는 자연 재난에 따른 위험을 직면하기도 한다. 2015년 국내 공용중인 사장교에서 번개에 의한 케이블 화재 사고가 발생하였다. 이 사건으로 인해 케이블이 파단이 발생하였고, 교량 붕괴의 위험까지도 고려되었다. 또한 이 사고로 인해 엄청난 사회적 경제적 비용이 요구되었다. 이 사건 이후로 이러한 대형 인프라 시설물에 대한 리스크 기반의 유지관리가 요구되고 있다. 본 연구는 잠재적 인 케이블 피해로 인한 교량의 안전 수준을 평가하기 위하여 수행되었고, 국내의 사장교 1개소를 선정하여 효율적이고 신속한 관리를 위한 의사결정 지원을 목표로 케이블 시스템의 손상 시나리오에 따른 교량 안전 수준을 평가하였다. 사장교의 케이블 손상 시나리오에 따른 안전 수준은 FEM 해석을 통하여 분석되었다.

Keywords

References

  1. H. H. Na, Y. H. Kim, S. Shin, "Analytical Method to Determine the Dynamic Amplification Factor due to Hanger Cable Rupture of Suspension Bridges", Journal of the Earthquake Engineering Society of Korea, Vol.18, No.6, pp.301-308, 2014. DOI: https://dx.doi.org/10.5000/EESK.2014.18.6.301
  2. H. Gil, J. H. Hur, H. Kwon, "Cable Fire due to Lightning and Repair of Seohae Bridge", Korean Society of Civil Engineers Magazine, Vol.64, No.7, pp. 2016.
  3. Korean Society of Civil Engineers, Design Guidelines for Steel Cable-Supported Bridges, Korean Society of Civil Engineers, 2006.
  4. PTI(Post-Tensioning Institute), "PTI DC45.1-12: Recommendations for Stay Cable Design, Testing and Installation", 4th ed., Arizona: PTI, Phoenix, 2001.
  5. Y. H. Kim, H. G. Go, J. C. Kim, S. Shin, "Effects of Cable Rupture on Dynamic Responses of a Concrete Cable-stayed Bridge", Journal of the Korea Institute for Structural Maintenance and Inspection, Vol.16, No.3, pp.84-91, 2012. DOI: https://dx.doi.org/10.11112/jksmi.2012.16.3.084
  6. Y. Park, "A Study on the Dynamic Amplification Factor for the Evaluation of Cable Loss Effect in a Cable-Stayed Bridge", Thesis of Master's Degree, Seoul National University, 2007.
  7. Korean Society of Civil Engineers, Korean Highway Bridge Design Code, Korean Society of Civil Engineers, 2008.
  8. MIDAS, Midas Civil [Internet]. MIDAS, c2018[cited 2018 Jan. 8], Available From: http://kor.midasuser.com/civil/ (accessed Jan. 8, 2018)
  9. S. J. Kim, J. H. Choi, D. H. Won, T. H. Han, Y. J. Kang, "Change of Statical Behavior and Ultimate Capacity of Steel Cable-stayed Bridges after Cable Failure", Journal of Korean Society of Steel Construction, Vol.23, No.6, pp.747-761, 2011. UCI: https://uci.or.kr/G704-000475.2011.23.6.010