프리스트레스트 CFT 보강 강박스거더의 크리프로 인한 프리스트레스 손실 평가

In this study, a long-term behavior analysis of the CFT was conducted based on AEMM to establish the prestress loss evaluation method of steel box girder reinforced with prestressed CFT. The drying creep characteristic of CFT was analyzed by referring to the experimental result of previous researchers, and a modified creep coefficient model of CFT was proposed. Furthermore, the modified model was verified by comparing it with the existing design model. After that, in order to confirm the predictive performance of the prestress loss evaluation method using modified model, an steel box girder reinforced with prestressed CFT mock-up specimen was manufactured and long-term deformation was measured for about 90 days. As a result, it was confirmed that the predicted values shows good agreement with the long-term measurement data of mock-up specimens.