| 논문명 |
고속철도 PSC 박스 거더 교량의 경간수에 따른 지진취약도 함수 수정계수 / Adjustment Factors for Seismic Fragility Characteristics of High-Speed Railway PSC Box-Girder Bridges with Different Span Numbers |
| 수록사항 |
한국지진공학회 논문집, Vol.30 No.5(통권 173호) (2026-09) |
| 주제어 |
; High-speed railway bridge; PSC box-girder bridge; Seismic fragility; Adjustment factor; Track-bridge system |
| 요약2 |
Seismic resilience assessment of railway networks requires fragility functions for all bridges in the network. However, developing detailed probabilistic models and conducting nonlinear time-history analyses for each bridge configuration requires substantial computational effort. To overcome this limitation, this study proposes adjustment factors for system-level seismic fragility curves for prestressed concrete box-girder bridges, the most common class of high-speed railway bridges in Korea, with different numbers of spans. A database was constructed from design documents of 69 bridges in the first phase of the Honam High-Speed Railway, and major uncertain model parameters were identified.
Three-dimensional probabilistic track-bridge models were generated using Latin hypercube sampling, and nonlinear time-history analyses were performed for 2-, 3-, 4-, 5-, 10-, and 20-span bridge models. Component fragility curves were derived using probabilistic seismic demand and limit-state models, and system fragility curves were obtained under a series-system assumption. Bearing responses dominated the slight-limit-state system fragility, followed by column responses. As the number of spans increased from 2 to 20, the median value of the fragility curve decreased by approximately 67%. Finally, adjustment factors for the median value and dispersion of the fragility curve were proposed to estimate the seismic vulnerability of bridges with different numbers of spans without additional computational effort. |
