Abstract:Based on the design of Xining Nanchuan Shenning road five span variable cross-section prestressed continuous beam bridge, through the finite element analysis, it is concluded that the five span continuous beam of this project does not appear positive bending moment under any working condition within the range of secondary side span, but is negative bending moment, the height of fulcrum beam is large, the transverse beam does not need to set prestress, and the prestress loss of multi span continuous beam is large, the calculation needs to be studied. Due to the large beam height at the fulcrum, in order to ensure that the bridge works better in the operation state, the vertical prestress is set within a certain range of the fulcrum as the safety reserve of the bridge. In this design, connectors are needed to connect the longitudinal prestress of web to ensure that the tension length and tension control force of single web meet the requirements.