Overall Design of Hanjiatuo Changjiang River Bridge on Chongqing-Lichuan Railway

The main bridge of Hanjiatuo Changjiang River Bridge on Chongqing-Lichuan Railway is a semi-floating system steel truss girder cable-stayed bridge with double pylons,double cable planes and with span arrangement(81+135+432+135+81) m.The main girder of the bridge is the N-shape steel truss girder with parallel chords and the girder is composed of two main trusses that are 18 m apart,14 m high and 13.5 m long for an panel length.The deck of the bridge is the integral steel structure deck used with orthotropic steel plates and the panel points are the welded integral panel point structures.The pylons are the kinked H-shape pylons,187.5 m in maximum height and are constructed with C50 concrete.There are totally 56 pairs of high-strength galvanized steel wire stay cables for the whole bridge and the cables are arranged in parallel fan shape and in double cable planes.In the design of the bridge,the vortex-excited vibration of the steel truss girder has been economically and effectively suppressed through arrangement of the guide vanes in sections at the bottom of the lower chords and the new type of the lock device with control switch that can control the structural vibration due to train braking and the comprehensive control system of viscous dampers that can control the seismic response of the bridge have also been developed.