Reinforced Concrete Continuous Curved Box Girder Bridge Temperature Deformation

The application of reinforced concrete continuous curved box- girder bridges is apparently wide, and it had becoming an important bridge style in modern communication engineering. However, during the actual application of abundance projects, with the operation of RC continuous curved box-girder bridges, the beam body occurred the outward displacement along racial direction and took on obviously circumrotate and overturning tendency. The research had shown that the main reason resulting in the deformation of RC continuous curved box-girder bridges is the change of temperature. Based on the LuoMa Bridge Quzhou city and the collection about a great deal of temperature gradient for continuous box-girder bridges, lots of test data were attained and analyzed. From these data and calculation, the paper derives the distributior, form of temperature for long cantilever continuous curved box-girder bridges on highway in ZheJiang region. By finite element program (ANSYS) the influence about different geometric parameters to the deformation for RC continuous curved box-girder bridges was calculated and obtained the affected regulation; at the same time ,with the result of calculation from design and structure aspects the limiting measurements of unfavorable deformation on temperature load for curved box-girder bridges were proposed. The research founding is hoped to have some reference value for the regulation of temperature gradient for curved box-girder bridges and prevention the excessive displacement along racial direction, and the perfection of design theory for curved bridges.