The Transverse Stress Effectiveness Analysis Of Prestressed Variable Cross-section Concrete Box Girder Bridge

As the well capacity of carrying on structural press, the adoption of girder boxbecomes increasingly popular. With the span increase, in order resist the load edgeof the upper plate under tensile stress, designer arrange transverse tendons in theroof. But the disease of longitudinal crack in upper plate is still emerged in this typebridge. the transverse prestressing in practice is not reach the design expect. Don’tconsider the framing effect of variable cross-section continuous box girder bridge isa reason for longitudinal cracking. When the lateral pressure stretched. Deformationin the roof at the same time, the web and the base plate will also be deformed, it willoffset part of the transverse prestress. When the web height height, thickness and thethickness of the base plate changed, its stiffness will also change, which is not thesame influence for the transverse prestress. In the variable cross-section continuousbox girder bridge, along the axial direction, the framing effects of the differentsections of the transverse prestress of the upper plate center, only the impact offraming effects, a detailed study of the design of prestressed concrete continuousbox grider bridge’stransverse prestress to provide a reference, to prevent the upperplate longitudinal crackingAnalyzing the spatial limitations in the use of ANSYS and calculating the roofgirder pressure on different girder。 With the help of the ANSYS in the analysis ofthe effect from size changes in thickness of abdomen girder on lateral pressure, wecould know that the factor may affect the lateral pressure. Analyze the spread angleof transverse on the upper plate,For the prevention of upper plate cracks,For example, when construct Huang Jia Long Bridge, we settle a measurer inthe center of the roof girder to calculate the lateral pressure. Then we will comparethe results from the plot with that from the laboratory to justify if the spatialconstruction good or not. while the spatial analysis could deal with some drawbacksthat planar analysis could not do. Finally, this essay summaries some disadvantagesin recent methodology and advise how to avoid roof dehiscence and somesuggestions on further studies.