Internal Force Correction Method of Solid Element Finite Element Model of Continuous Beam Arch Bridge Based on Stress-Free State Control Method

Different construction methods and bridge completion time have great influence on the internal force of the main beam of concrete bridge. The traditional solid finite element modeling scheme is difficult to consider the influence of construction methods and bridge completion time on the internal force of the main beam of concrete bridge, and the finite element accuracy of the rod system is difficult to meet some engineering and research requirements. Taking a three-span continuous beam arch bridge as an example, based on the theory of stress-free state control, this paper proposes a method to first calculate the difference between the stress-free state quantity of the main beam with and without considering the construction method and the bridge completion time, and then convert the stress-free state quantity into the temperature field of a section beam through the temperature linear expansion coefficient to correct the internal force of the solid finite element model. It is found that the corrected results are good and the accuracy can meet the needs of practical engineering or bridge research.