Design of Steel Truss Composite Girder of Main Bridge of Sanmenxia Huanghe River Rail-cum-Road Bridge

摘要

ublishercopyright>? 2018, Journal Press, China Railway Bridge Science Research Institute, Ltd. All right reserved.? 2018, Journal Press, China Railway Bridge Science Research Institute, Ltd. All right reserved. The main bridge of Sanmenxia Huanghe River Rail-cum-Road Bridge is a 11-span continuous steel truss composite girder bridge with span arrangement (84+9×108+84) m. The bridge is designed as a double-deck bridge. The lower deck of the bridge is to carry the 4-track railways (2 tracks for Inner Mongolia Westbound Railway+2 tracks for Yuncheng-Sanmenxia Railway) while the upper deck to carry the dual 3-lane expressways. The main girder of the bridge is the steel truss girder provided with the dense cross beam system. In the transverse direction of the main girder, 3 main trusses of the triangle shape trusses are arranged. The lower railway deck is the one having the integral orthotropic steel deck plates supported on the dense cross beam system and at the locations where the steel rails are to be laid, the inverted T-shape stringers are arranged. The upper highway deck is the one having the C60 reinforced concrete deck slabs that are connected into an integrity with the upper chords and cross beams of the steel main trusses via the wet joints and shear studs. In the transverse direction of the main trusses, the bracing systems are not arranged while only at the bottom of the highway cross beams at the both ends, the plate portal frames are arranged. A number of the measures of selecting the proper working procedures for the concrete slab connecting and the main truss jacking-up and -down and of selecting the proper storage age of the precast concrete slabs, properly handling the wet joints and enhancing the reinforcement in the concrete slabs was taken so as to improve the tensile cracking problem of the concrete slabs in the sagging moment areas of the composite girder. The steel trusses of the main bridge are to be erected by the hauling and pushing construction method.The main bridge of Sanmenxia Huanghe River Rail-cum-Road Bridge is a 11-span continuous steel truss composite girder bridge with span arrangement (84+9×108+84) m. The bridge is designed as a double-deck bridge. The lower deck of the bridge is to carry the 4-track railways (2 tracks for Inner Mongolia Westbound Railway+2 tracks for Yuncheng-Sanmenxia Railway) while the upper deck to carry the dual 3-lane expressways. The main girder of the bridge is the steel truss girder provided with the dense cross beam system. In the transverse direction of the main girder, 3 main trusses of the triangle shape trusses are arranged. The lower railway deck is the one having the integral orthotropic steel deck plates supported on the dense cross beam system and at the locations where the steel rails are to be laid, the inverted T-shape stringers are arranged. The upper highway deck is the one having the C60 reinforced concrete deck slabs that are connected into an integrity with the upper chords and cross beams of the steel main trusses via the wet joints and shear studs. In the transverse direction of the main trusses, the bracing systems are not arranged while only at the bottom of the highway cross beams at the both ends, the plate portal frames are arranged. A number of the measures of selecting the proper working procedures for the concrete slab connecting and the main truss jacking-up and -down and of selecting the proper storage age of the precast concrete slabs, properly handling the wet joints and enhancing the reinforcement in the concrete slabs was taken so as to improve the tensile cracking problem of the concrete slabs in the sagging moment areas of the composite girder. The steel trusses of the main bridge are to be erected by the hauling and pushing construction method.