Continuous Box Girder Bridge Prestressed Structure Optimal Design

As China's highways and urban roads in the development of prestressed concrete continuous box-girder bridge with a variety of advantages, which are widely used in the construction. Therefore, to optimize the design of its structure has practical significance. In this paper, combining the relevant information to the department of prestressed concrete continuous box girder bridge, the structure cost as the objective function to regulate the construction, are cross-section strength as well as the construction and use phases such as requirements for the stress constraints in order to box girder cross-section of the beam height is design variables, the application to improve enumeration method ultimately be constructed in three different sections of the form. In conjunction with the data, through the finite element analysis program for its optimum design MIDAS were calculated. Optimization results showed that different cross-sectional form, with the high beam optimization can bring a more objective economic benefits.