Design of Long-Span Continuous Beam Bridge with Corrugated Steel Webs Constructed by Cantilever Assembly

Bridge prefabrication and assembly construction technology has been popularized and applied from normal span bridges to large span bridges. The Nanyang Xiangjiang River Bridge in Wushi-Yiyang Highway is facing severe challenges such as: extreme environmental protection requirements in Dongting Lake area, deep and soft foundation and short construction period etc. The bridge adopts (76.3 + 3 × 120 + 76.3) m span corrugated steel web composite box girder with variable cross-section depth, erecting by factory prefabrication and site assembly. The design concept innovation and detailed structure of the bridge are introduced in this paper. In addition, the construction process and operation state of the bridge are simulated by finite element methods. The calculation results show that the overall bearing capacity of the bridge, the shear bearing capacity of the corrugated steel webs, the horizontal shear bearing capacity of the corrugated steel web connectors, and the bending bearing capacity of the corners of the corrugated steel web connectors meet the stress requirements. And the anti-slip margin coefficient of the corrugated steel web connectors is above 1.29, while the maximum tensile stress of the external prestressed steel strand of the bridge is 1043 MPa. At present, the bridge has been completed and opened to traffic, saving the construction period of 4 months, providing a significant reference for similar projects.