Fatigue damage in bending of reinforced concrete frames using non-destructive tests for dynamic strength of the cylinder

Milašinović, Dragan D.; Landović, Aleksandar; Goleš, Danica

doi:10.1108/ec-06-2021-0343

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…Regardless of the traditional natural aging method, thermal aging method, hammering method, or ultrasonic impact, they all have limitations, and they cannot realize the in situ local regulation and elimination of residual stresses of service components [11][12][13][14][15][16][17]. (1) The natural aging method is time-consuming, has low efficiency and a large footprint, and is difficult to control, with other shortcomings limiting its wide and effective application.…”

Section: Introductionmentioning

confidence: 99%

Welding Residual Stress Elimination Technique in the Top Chord of Main Truss of Steel Truss Bridge

Piao

Yuan²,

et al. 2023

Buildings

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The large-amplitude fluctuations of ultrasound in high-energy ultrasonic stress relieving cause the crystal grains or lattices in the high residual stress zone to vibrate or creep alternately. This triggers secondary effects such as ultrasonic softening and dislocation movement. The sound field also produces periodic shock waves or intermittent shock waves, which form local pressure gradients at the wave front. These pressure gradients cause local heating of the grain boundary, accelerating material softening and promoting slip between grains, ultimately resulting in residual stress elimination. This technique was applied to detect the welding residual stress of the upper chord of the main truss of Sanguantang Bridge by using an ultrasonic stress meter. After the measurement, it was found that the welding residual stress in some areas was too large, and the welding residual stress needed to be eliminated. The welding seam was re-inspected after the residual stress relief operation was completed. The test results showed a maximum reduction rate of 63.91% and an average overall reduction rate ranging from 24.52% to 37.23%. The reduction effect is more significant in areas with higher welding residual stress.

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