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| Application of Roof Short Prestressed Tendons in Urban Small Radius Curved Girder Bridge |
| XU Yan － qi |
| Beijing General Municipal Engineering Design and Research Institute，Beijing 100082，China |
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Abstract Research purposes: When designing the small radius curved girder bridge，in order to save time，the long prestressed tendons are always arranged because the design time is short． But this arrangement of the prestressed tendons may cause uneven load bearing between the internal curve and external curve and waste of the engineering materials． For a prestressed concrete ramp bridge with radius of 54． 5 meters of the 5th ring road overpass at Guangqu Road in Beijing，the long tendons and short tendons + long tendons were respectively arranged，the three － dimension bar element models were established with the MIDAS / Civil for these two types of the arrangement． The discussion was made on the differences of the support reaction between the internal curve and external curve，the torsion and torsional stress，the effective prestress and the structure＇s economical efficiency of these arrangements in order to provide the reference to the design．
Research conclusions: From the research presented in this paper，it is known the right way to arrange prestressed tendons is the long tendons as the dominant role and the short tendons as the subsidiary role． The reasonable way to arrange prestressed tendons can effectively improve the structures ＇s load bearing condition，decrease the structure ＇s deformation，make the support reaction even between the internal curve and external curve，reduce the prestress loss and improve the structure＇s economical efficiency．
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Received: 08 December 2011
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2012, Vol. 29 
