Span Continuous Curved Box Girder Bridge Construction Phase Force Characteristics Analysis

As high speed development of the traffic industry, the need for long span pre-stressed concrete continuous curved box-girder bridges in construction of highways, urban overhead crossings and viaducts is bigger and bigger. But the existing computing method can't satisfy the precision demand hi analysing long span curved box-girder bridges.The writer has been engaged in bridge design and construction for some years and doing attempting studies in mechanical characters of long span curved box-girder bridges in construction phase. In this paper, the Golden Phoenix Bridge over Meixi river in Shantou-a long span curved box-girder bridge in Xigang viaduct project-is taken as computing and analysing model. By using the spacial analysis software ASBEST'98, its mechanic characteristic such as stress, shear lag and displacement is analyzed. By contrasting curved bridge and straight bridge, influence of dead load and prestressing force on the stress in cantilever casting period of curved bridges is analyzed.In this paper, the controlling problem in construction phase is specially studied. The displacement and tortion caused by dead load and prestressing force in cantilever casting period are provided.Some proposals are offered for design and construction in this paper. All these results will not only aid the bridge engineering design and construction, but also provide more useful information for further research on static behavior of curved-girder.