고강도 및 탄성계수 증진 고성능 콘크리트 적용 PSC 거더형 사장교의 장기거동 예측

The current study presents an algorithm of the long-term behavior analysis of cable stayed bridge with PSC girders using high-performance concrete (HPC), which concrete was cast for high-strength and enhancing elastic modulus. The prediction of time-dependent behavior of HPC members is modeled by improving the AASHTO-LRFD (2004) method for normal concrete in the prediction of creep, shrinkage, and relaxation of tendon. The long term analysis was performed to determine the effects of creep and shrinkage of concrete, additionally, with the effect of construction stages varying with time. The developed model for prediction of HPC material has been applied in the long-term analysis of cable-stayed bridges to compare with the several types of concrete. By using HPC to compare with normal concrete, it gives some advantages in the design of PSC cable-stayed bridges that axial and transverse deflections of girders can reduce and the result may minimize the size of HPC girders, overall weight of the bridge, and increase the span length of girders.