A Method for Reducing Welding Residual Stress of Orthotropic Steel Bridge Deck

Abstract

The invention discloses a method for reducing the welding residual stress of orthotropic steel bridge decks, which is specifically as follows: the welding parameters and welding parameter values ​​in the welding process of steel bridge decks are collected and the actual welding process of orthotropic steel bridge decks is limited; The welding residual stress field of the steel bridge deck after welding is obtained by element model and simulation, and the theoretical residual stress field is obtained by further finite element simulation of the annealing process; the actual residual stress field is obtained by measuring the typical weld seam of the steel bridge deck and the surface residual stress field near Stress field; according to the actual and theoretical residual stress field, the established finite element model is corrected so that the theoretical residual stress field can reflect the actual residual stress field and the annealing optimization parameters for the minimum welding residual stress of orthotropic steel bridge deck are obtained and input for annealing execution The steel bridge deck that needs to be annealed is placed on the terminal and then annealed; this treatment method can reduce the welding residual stress of the orthotropic steel deck at one time, 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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