Method of weakening combined action of bridge deck system participating in main truss

Abstract

The invention relates to a method of weakening the combined action of a bridge deck system participating in a main truss. The method comprises the steps that main truss rod pieces and cross beams are manufactured and assembled; the prestress is symmetrically applied to two ends of main truss chord members, so that the main truss chord members are compressed and deformed; bridge deck longitudinal beams are manufactured according to the distance of the shortened main truss; after the bridge deck longitudinal beams are mounted, the prestress which is applied to the two ends of the main truss chord members is removed; the main truss chord members recover the compressive deformation to drive the bridge deck cross beams to deform simultaneously; the deformation of the bridge deck cross beams is subjected to the restraint of the bridge deck longitudinal beams, the bridge deck cross beams produce the bending moments, and the directions of the bending moments are opposite to the directions of bending moments of the bridge deck cross beams, which are produced when the bridge deck system participates into the mutual stress of the main truss chord members; when the bridge deck system participates into the combined action of the main truss chord members, the produced internal force is offset by the internal force which is produced by the prestress in an earlier stage, the combined action of bridge deck system participating in the main truss is weakened, and the stress performance of the longitudinal beams and the cross beams is improved. Due to the adoption of the method, the cross sections of the bridge deck cross beams are reduced and simplified, the connection structures of the cross beams and the main truss chord members are simple, steel is saved, the used amount is small, and the later maintenance workload is little.

Description

technical field [0001] The invention relates to a method for weakening bridge deck systems to participate in the joint action of main trusses. Background technique [0002] For steel truss girders with longitudinal and transverse girder systems on the bridge deck, due to the influence of the bridge deck system participating in the joint action of the main truss, the bridge deck beams are subjected to vertical bridge bending moments while bearing vertical loads, resulting in large internal forces of the beams, resulting in Difficult beam design. The conventional way to solve this problem is to increase the cross-section of the beam. This approach increases the amount of steel used, complicates the connection structure, and increases the post-maintenance work of the bridge. At the same time, after the cross-section of the beam is enlarged, the moment of inertia of the cross-section increases, and when participating in the joint action, the internal force borne also increases...

AI Technical Summary

Problems solved by technology

This method increases the amount of steel, complicates the connection structure, and increases the post-maintenance work of the bridge

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