About the author:

1. CCCC Second Harbor Engineering Co., Ltd.,Wuhan,Hubei 430040, China;2.Key Laboratory of Large-span Bridge Construction Technology,Wuhan,Hubei 430040,China;3.CCCC Highway Bridges National Engineering Research Centre Co., Ltd.,Beijing 100088,China

Abstract:

The main tower of Changtai Yangtze River Bridge adopts the steel-concrete mixed space diamond shape，the structure is complex and the construction is difficult. In order to explore the structural performance of the lower pylon during construction, the finite element model of the pylon was established by MIDAS/Civil software and the construction of the lower pylon was analyzed. The results show that setting two pull rod can improve the tensile stress at the root of the pylon during construction. The disconnection of the transverse bridge support is beneficial for its linear control of the lower crossbeam; The effective push force of the lower beam of the longitudinal bridge has a linear relationship with the relative displacement of the closing port and the tensile stress of the tower limb root.The maximum tensile stress of the bracket is 106MPa, and the maximum compressive stress is 125MPa; The on-site measurement results are in good agreement with the theoretical calculation results.