비선형 해석 모델이 PSC 교량의 횡방향 거동 해석에 미치는 영향 평가 = Comparative Study of the Effects of Nonlinear Modelling on the Analysis of Transverse Behavior of the Prestressed Concrete Bridges

다국어 초록 (Multilingual Abstract)

A comparative study for the effects of nonlinear modelling on the transverse behavior of PSC(Prestressed Concrete) bridges due to the wind load is presented. To account for the nonlinear behaviors of the PSC bridges under the wind load, the effects of material and geometric nonlinearities as well as the time-dependent properties of materials are considered. For the material nonlinear analysis, the nonlinear stress-strain relationship and cracking of concrete and nonlinear stress-strain relationships of reinforcing steel, prestressing steel and cable including load reversals are considered. For geometrical nonlinear analysis, geometric nonlinearity due to the large axial load acting on the member and geometric nonlinearity due to finite or large deflections are considered. Various comparative studies regarding the effects of material and geometric nonlinearities on the transverse behavior of segmentally erected PSC girder bridge and PSC cable-stayed bridges are carried out. The numerical results on these bridges show that the analysis considering both effects of material nonlinearity due to crack of the concrete and geometric nonlinearity due to increase of transverse deflections of the bridge deck under the wind load is important to predict the transverse behaviors of the PSC bridges due to the wind load to a certain degree of accuracy during the construction or after the completion of the bridges.