72m 초고강도 콘크리트 프리스트레스트 박스 거더의 수치 해석
Numerical Simulation of 72m-Long Ultra High Performance Concrete Pre-Stressed Box Girder
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초록
이 논문은 72m 초고강도 콘크리트 섬유보강 콘크리트 프리스트레스트 박스거더의 비선형 거동을 해석하는 3차원 해석방법을 제시하였다. UHPC재료의 비선형 거동을 나타내기 위해 콘크리트 손상소성(CDP)모델을 채택하였다. 제시된 응력-변형률 관계 곡선에근거한 수치해석 모델은 50m UHPC 프리스트레스트 박스 거더 휨실험결과로 검증하였다. 검증된 해석모델을 사용하여 72m UHPC프리스트레스트 박스거더의 휨거동을 파악하는데 적용하였다. 각 하중단계에 따른 하중 변위관계, 응력상태 및 연결부분 상세를 해석하였다. 하중-변위관계 곡선과 설계하중 및 극한하중 비교 결과는 UHPC 박스거더 휨거동을 해석하는 적절한 수단으로써 비선형유한요소법의 적용성을 입증하고 있다.
Abstract
The study presents a three-dimensional approach to simulate the nonlinear behavior of a 72 m long Ultra High Performance FiberReinforced Concrete (UHPFRC) pre-stressed box girder for a pedestrian bridge in Busan, South Korea. The concrete damage plasticity (CDP)model is adopted to model the non-linear behavior of the UHPFRC material, in which the material properties are obtained from uniaxialcompressive and tensile tests. The simulation model based on the proposed stress-strain curve is validated by the results of four-point bendingmodel tests of a 50 m UHPFRC pre-stressed box girder. The results from the simulation models agree with the experimental observations andpredict the flexural behavior of the 50 m UHPFRC pre-stressed box girder accurately. Afterward, the validated model is utilized to investigatethe flexural behavior of the 72 m UHPFRC pre-stressed box girder. Here, the load-deflection curve, stress status of the girder at various loadlevels, and connection details is analyzed. The load-deflection curve is also compared with design load to demonstrate the great benefit of theslender UHPFRC box girder. The obtained results demonstrate the applicability of the nonlinear finite element method as an appropriate optionto analyze the flexural behavior of pre-stressed long-span girders.
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