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윤성식(Sungsik Yoon) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.3
Recent frequent earthquakes have caused serious damage to water supply structures, significantly affecting the drinking water supply of local residents. In particular, because water supply structures are extensively buried underground, prediction of their deteriorated performance against external disturbances is crucial for maintenance purpose. Therefore, this study aims to evaluate the degraded seismic performance of the water transmission network based on connectivity-based network analysis against seismic conditions. The proposed methodology consists of i) network map reconstruction using a graph theory, ii) ground motion generation considering the uncertainty of seismic motion, and iii) connectivity verification between source and sink nodes. To demonstrate the proposed methodology, the network topology was reconstructed by adopting the water transmission network located in A-city, and the seismic performance of the target network was evaluated considering the epicenter of the historical earthquakes. As a result of numerical analysis, the seismic response of the water transmission network showed the highest network connectivity when the water was supplied from node 62, and water was stably secured at node 107 under different earthquake magnitudes.
교량 복구 우선순위에 따른 도로망의 내진 복원력 비교 연구
윤성식(Sungsik Yoon) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.2
최근 빈번히 발생하는 지진은 교량 구조물의 손상을 발생시켰고, 그 결과 도로 네트워크의 통행시간 증가에 따른 큰 불편을 초래하였다. 본 연구에서는 도로 네트워크에 지진이 발생하였을 때 교량의 복구 우선순위를 결정하고, 인공신경망을 활용하여 내진 복원력을 비교하고자 한다. 이를 위하여, 교량의 복구순위를 결정하기 위하여 1) 성능기반, 2) 이익-비용에 기반한 복구순위를 도입하였다. 제안된 복구 우선순위에 따른 도로망의 내진 복원력을 비교하기 위하여 실제 포항 도로 네트워크를 재구성하였다. 수치해석 결과 이익-비용에 기반한 복구 우선순위보다 성능에 기반한 복구 우선순위가 더 신속한 복원력 곡선을 나타내었다. Recently, frequent earthquakes have damaged bridge structures, causing great inconvenience owing to the disruption of transportation networks and increasing travel time. In this study, the restoration priority of bridges under seismic conditions was proposed and the seismic resilience curves were compared based on an artificial neural network model. To determine the restoration priority of bridges, 1) performance-based and 2) benefit-cost-based restoration priorities were introduced. For demonstration purposes, the actual Pohang road network was reconstructed and the seismic resilience curves of the transportation network corresponding to the proposed restoration priorities were compared. Numerical analysis showed that the performance-based restoration priority had a more rapid seismic resilience curve than benefit-cost-based restoration priority.