Method for reducing welding residual stress of orthotropic steel bridge deck

Abstract

The invention discloses a method for reducing welding residual stress of an orthotropic steel bridge deck. The method specifically comprises the steps of collecting welding parameters and welding parameter values during welding of the steel bridge deck, establishing a finite element model for an actual welding process of the orthotropic steel bridge deck and performing simulation, obtaining a welding residual stress field of the steel bridge deck after welding, further performing finite element simulation on an annealing treatment process to obtain a theoretical residual stress field, measuring typical weld seams of the steel bridge deck and surface layer residual stress fields of areas near the typical weld seams so as to obtain an actual residual stress field, correcting the establishedfinite element model according to the actual and theoretical residual stress fields so as to enable the theoretical residual stress field to reflect the actual residual stress field, obtaining annealing optimization parameters with the minimum welding residual stress of the orthotropic steel bridge deck, inputting the annealing optimization parameters into an annealing execution terminal, and performing annealing treatment after placing the steel bridge deck which requires the annealing treatment. The treatment method can reduce the welding residual stress of the orthotropic steel bridge deckat one go, thereby increasing the fatigue strength and prolonging the service life.

Description

technical field [0001] The invention relates to the technical field of bridge manufacturing, in particular to a method for reducing welding residual stress of orthotropic steel bridge decks. Background technique [0002] The orthotropic steel deck consists of a roof, longitudinal ribs, and transverse ribs that are welded to form a modern steel deck structure with significant differences in longitudinal and transverse stiffness. Welding is an indispensable processing technology for the manufacture of orthotropic steel bridge decks, but the metal materials are heated and cooled unevenly during the welding process, and finally form welding residual stresses of different sizes and uneven distribution inside them. The weld seam and its surrounding areas form residual tensile stress, and the surrounding metal forms residual compressive stress. [0003] Orthotropic steel deck is the main deck form of long-span steel structure bridges. However, due to the large number of longitudin...

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Problems solved by technology

[0005] At present, there are many treatment methods to reduce the welding residual stress of orthotropic steel bridge decks, such as hammering method, shot peening method and ultrasonic impact method. For welding structures with simple manufacturing process, regular appearance and small size, adopt The above method can only reduce the welding residual stress on the surface of each plate, but for the orthotropic steel bridge deck with complex welding details and a large number of welds, the above method cannot be used to quickly reduce the stress inside each plate of the orthotropic steel bridge deck. welding residual stress

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