| With the rapid development of urban transportion, urban overpass curved girderbridges can be adapted to limitation of different terrain and the existing buildings, andthe structure is charactered of smooth lines,fluency，and the beautiful sense. Moreover，Curved bridge owns beautiful shape, not only to enhance elegant appearance to the city,but also to ease traffic congestion, the curved bridge has a very important role in themodern urban transportion. and prestressed layout is crucial in curved bridge design,.This paper mainly study and analyse the mechanics affection of differentprestressed beam layout scheme curved bridge by the load. As the Da Hua curvedbridge an example, an overpass is researched in this thesis, with the model of the finiteelement software MIDAS/Civil and MIDAS/FEA, and the mechannical impact ofprestressed bar arrangement in curved girder bridges is researched.First of all, the mechanical characteristics of the curved girder bridge andprestressed analysis theory is described, and various theoretical calculations andprestressed theories about curved bridge is discussed, not only including curved girderdifferential equations derivation, shear—torsion theory discussion,but also containingprestressed reasonable center line of gravity, the equivalent load, friction loss andlongitudinal distribution.Secondly, with regards to the mechanical affection of prestressed bar in curvedgirder bridges,this paper discusses the principle of tendon concrete box girder. sixlayout scheme model of continuous curved bridge is built by MIDAS/Civil, afterwardsthe calculation results is analysed,meanwhile the optimal placement program ispresented.Finally, according to the proposed optimal arrangement, detailed analysis of theproposed scheme is verified by the software FEA. analysing whether the calculationresults meet the regulatory requirements. The aim is to provide a reference for similarafter the design of the bridge type. |
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