Design of Main Bridge of Huhehaote-Zhungeer Railway Huanghe River Bridge

The main bridge of the Huhehaote-Zhungeer Railway Huanghe River Bridge is a prestressed concrete hybrid bridge of rigid frame and continuous girder with span arrangement (98 + 5 × 168 + 98) m. The main girder of the bridge is the C55 concrete single-cell single-box girder of variable section and is arranged with the three-way prestressing system and pre-reserved with the tensioning components for external prestressing strands inside the girder. The main piers are the hollow piers of round-end sections (the two intermediate piers are rigidly fixed with the main girder) and are supported on the frictional pile foundations. To accommodate the large temperature expansion amount of the bridge,the large movement expansion joints and sliding bearings were developed and the software MIDAS Civil was used to carry out the static and dynamic analysis of the bridge. The results of the analysis indicated that the rigidity and strength of the bridge at both the construction and operation stages could meet the relevant requirements in the codes and the bridge had good seismic resistance. The bridge was constructed by the cantilever casting method and the closure sequence of the main girder was that the side spans were closed first and the central span was late.