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Abstract

In order to study the effect of local corrosion on the degradation of mechanical properties of high-performance Q550E steel beam, a model of corroded high-performance steel (HPS) beam was established by using the wall thickness reduction method, and the ultimate bearing capacity of the HPS beam was calculated by using the arc length method on the basis of considering the geometric initial defects and residual stress distribution of the beam. At the same time, according to the existing test results, the practicability of the model in the research on the bending degradation of corroded HPS I-section beams was verified. On this basis, the corrosion parameters of the top plate, web plate, and bottom plate of the HPS beam were analyzed. The simulation results show that the main failure mode of the simulated beam is the local buckling of the compression flange plate. The corrosion of the top and bottom plates does not change the failure mode of the corroded beam, and the residual ultimate bearing capacity of the corroded beam is linearly related to the corrosion degree of the top plate or bottom plate, in which the corrosion of the top plate has a greater effect on the performance degradation of the HPS beam than that of the bottom plate. When the corrosion degree of the web plate reaches 30%, the failure mode of the corroded beam changes, and the bearing capacity decreases rapidly.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.013

First Page

77

Last Page

82

Submission Date

May 2025

Reference

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