Study on Creeping of Continuous Curved Composite Box Girder Bridge

With the popularization and application of domestic steel structure bridges, various diseases will increase, and the creep phenomenon of ordinary concrete curved beams is also inevitable in steel structures. This paper firstly analyzes the influencing factors of creep caused by the continuous climbing box girder of an interchange bridge in Guangdong Province. And using finite element modeling to analyze the influence degree of each influencing factor on the deviation of curved bridges. The results show that the temperature gradient of sunshine and the centrifugal force of the car are the main factors affecting the creep of the structure, while the overall temperature rise is the inducing factor of creep. Secondly, it is explained that the creeping mechanism is due to the deviation of the overall heating structure, and the residual displacement occurs under the temperature difference of the sunshine and the load of the vehicle, which leads to the lateral displacement of the beam cannot be restored. In severe cases, the bearing will be damaged and the normal use of the structure will be affected. Finally, according to the analysis results, combined with the application of actual bridges, the corresponding maintenance, and repair measures are proposed, which have a certain reference function for the design and maintenance of similar curved composite beam bridges.