Method for reducing out-of-plane bending moment of ultra-wide truss web members

The invention provides a method for reducing the out-of-plane bending moment of ultra-wide truss web members. The method includes the steps that firstly, a calculation model of a main truss steel beam segment is established, and parameters of pre-applied force are extracted, wherein the main truss steel beam segment comprises a first assembly and a second assembly, the first assembly comprises a lower-layer bridge deck system and main trusses arranged on the two sides of the lower-layer bridge deck system, the main trusses comprise the web members arranged on the two sides of the lower-layer bridge deck system, and the second assembly comprises an upper-layer bridge deck system; the pre-applied force is applied to the tops of the main trusses; the first assembly is manufactured and assembled; the pre-applied force is applied to the main trusses on the two sides of the lower-layer bridge deck system; the second assembly is manufactured according to the distance between the tops of the two main trusses to which