Nonlinear Time-History Analysis and Derivation of Seismically Vulnerable Cables for an Asymmetric Concrete Cable-Stayed Bridge with Curved Pylon

Won Joo Park

doi:10.21729/ksds.2026.19.1.45

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2026 Vol.19, Issue 1 Preview Page

Original Article

Nonlinear Time-History Analysis and Derivation of Seismically Vulnerable Cables for an Asymmetric Concrete Cable-Stayed Bridge with Curved Pylon 곡선 주탑을 가진 비대칭 콘크리트 사장교의 비선형 시간이력해석 및 지진 취약 케이블 도출

31 March 2026. pp. 45-55

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Abstract

In this study, time-history analyses (THA) were performed on an asymmetric concrete cable-stayed bridge with curved pylon (Dunbyeong Grand Bridge) currently in service. The analyses were conducted using the ground motion of a magnitude 4.8 earthquake (Buan) that occurred in June 2024, which was scaled to the design code level. The results showed that the locations of seismically vulnerable cables identified under the completed-state condition differed from those determined through the time-history analyses, indicating that the cables exhibiting the maximum tension or the minimum safety factor in the completed-state condition are not necessarily the most vulnerable members under seismic loading. Based on the findings, it is considered reasonable to select seismically vulnerable cables at the locations showing the maximum variation in cable tension from the perspective of cable anchorage failure, and the minimum safety factor from the perspective of cable rupture, and to install cable tension meters at these locations.

Keywords

Cable-stayed bridge

Curved pylon

Time-history analysis (THA)

Geometric nonlinearity

Cable tension meter

본 연구에서는 실제 공용 중인 곡선 주탑을 가진 비대칭 콘크리트 사장교(둔병대교)를 대상으로 2024년 6월 발생한 규모 4.8(부안)의 지진에 대하여 설계기준 수준으로 스케일링하여 시간이력해석을 수행하였다. 그 결과 완성계 상태에서 지진 취약케이블과 시간이력해석에 따른 지진 취약케이블의 위치가 다르게 나타났으며, 이는 단순히 완성계의 최대장력 또는 최소안전율 위치가 지진에 가장 취약한 부재가 아닐 수 있음을 의미한다. 고찰 결과, 정착구 파단 관점에서는 케이블 장력 변동량이 최대인 곳, 케이블 자체 파단 관점에서는 최소 안전율이 발생되는 곳을 지진 취약케이블로 선정하고 케이블 장력계를 설치하는 것이 합리적이라 판단한다.

키워드

사장교

곡선 주탑

시간이력해석

기하비선형

케이블 장력계

References

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Korean References Translated from the English

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Information

Publisher :Korean Society of Disaster and Security
Publisher(Ko) :한국방재안전학회
Journal Title :Journal of Korean Society of Disaster and Security
Journal Title(Ko) :한국방재안전학회 논문집
Volume : 19
No :1
Pages :45-55
Received Date : 2026-01-07
Revised Date : 2026-01-16
Accepted Date : 2026-01-19
DOI :https://doi.org/10.21729/ksds.2026.19.1.45

Journal of Korean Society of Disaster and Security ISSN:2466-1147(Print) 2508-285X(Online) 한국방재안전학회 논문집

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Korean References Translated from the English