PSC 거더 교량의 부분 연속화를 고려한 모델 개선 방법 연구
Study on Finite Element Model Updating of Bridge Considering the Continuity of PSC Girder Bridges
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초록
우리나라는 1980년대 산업화로 인해 많은 교량이 건설되었고, 다양한 연속화 공법이 적용되었다. 이러한 교량들은 시간이 지나면서 점차 노후화되었고, 이에 따라 교량의 안전성을 확보하기 위한 내하력 평가의 중요성이 더욱 부각되었다. 특히, 1980년대 초에 시공된 PSC 거더교는 부분 연속화된 구조를 가지고 있어 이를 고려한 모델링 및 내하력 평가 방법이 필요하다. 기존의 내하력 평가 방법은 주로 완전 연속화된 교량을 대상으로 하였으나, 부분 연속화 교량은 하중 전달 특성이 다르기 때문에 차별화된 접근이 필요하다. 본 연구는 부분 연속화된 교량의 모델링을 개선하고, 이를 검증하는 실험을 통해 실제 교량의 내하력 평가에 적용할 수 있는 방법을 제시하였다. 기존 연구들이 주로 완전연속화된 교량을 대상으로 한 것과 달리, 본 연구는 부분 연속화된 교량의 모델링 및 평가 방법을 제시함으로써 부분 연속화된 교량의 내하력평가에서 정확성과 신뢰성을 높이는 데 중요한 기여를 하고 있다. 또한, 실험 데이터와의 비교를 통해 모델의 적용 가능성을 평가하였다. 바닥판만 연속화된 교량의 특성을 반영한 유한요소모델 개선 방법을 통해 기존 연구와 차별화를 이루었으며, 이를 실제 교량에서 수행된 재하시험데이터를 기반으로 검증하여 현장 적용 가능성을 확인하였다. 특히, 상시 진동 실험을 통해 교량의 동적 특성을 분석하고, 이러한 데이터를 활용하여 유한요소모델을 개선함으로써 부분 연속화된 교량의 실제 거동을 더욱 정확히 반영하고, 하중 분배와 처짐 거동을 정밀하게 평가할 수있도록 하였다. 이러한 연구 결과는 향후 부분 연속화 교량의 내하력 평가에 실질적인 예시로 사용될 수 있다. 부분 연속화가 고려된 개선된 모델의 하중 분배 거동이 실제 교량의 거동과 유사하며, 개선된 유한요소모델과 실측 처짐값의 오차는 0.8%~3.9%로 개선된 효과를 나타내었다
Abstract
During the industrialisation of the 1980s, many bridges were built in Korea and various continuity methods were applied. As time passed, the ageing of these bridges became an issue, making load-carrying capacity evaluations essential. In particular, PSC girder bridges built in the early 1980s have partial continuity, requiring specific modelling and evaluation methods. The model updating method that reflects the actual condition of the bridge can accurately predict and evaluate its behavior, thereby enhancing the reliability of the load-carrying capacity evaluation. The conventional load-carrying capacity evaluation methods have primarily targetting on fully continuous bridges; however, partially continuous bridges exhibit different load transfer characteristics, necessitating a differentiated approach. This study focuses on partial continuity in continuous bridges and suggests a method for load-carrying capacity evaluations, verified through field tests. Unlike previous studies that primarily focused on fully continuous bridges, this study aims to enhance the accuracy and reliability of load-carrying capacity evaluations for partially continuous bridges by proposing modeling and evaluation methods specifically tailored to these structures. Also, this study differentiates itself from previous research by improving the finite element model (FEM) to reflect the characteristics of bridges with only the deck slab made continuous. This improvement was validated using data from load tests conducted on actual bridges, confirming its potential for field application. The finite element model (FEM) was improved to reflect the characteristics of the bridge. Data from Ambient Vibration Tests was used to improve the finite element model, resulting in a close match with the actual behavior of partially continuous bridges and confirming the model's ability to precisely evaluate load distribution and deflection., with errors between the updating FEM and measured deflections ranging from 0.8% to 3.9%, demonstrating its effectiveness.
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