Hysteretic Behavior and Cyclic Constitutive Model of Q235 Steel After Corrosion

被引：0
|
作者：
Guo Q. [1 ]
Zhao Y. [1 ]
Li H. [1 ]
Wang Y. [2 ]
机构：
[1] College of Civil Engineering, Taiyuan University of Technology, Taiyuan
[2] Shanxi Fifth Construction Group Co.，Ltd., Taiyuan
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 05期
基金：
中国国家自然科学基金;
关键词：
atmospheric corrosion; behavior; corroded steel; cyclic constitutive model; cyclic loading; hysteretic;
D O I：
10.11784/tdxbz202204021
中图分类号：
学科分类号：
摘要：
The cyclic loading test was conducted on Q235 steel specimens corroded in the atmosphere for 33 years. The relationships between corrosion degree and fracture mode，energy dissipation capacity，and skeleton curve of corroded steel were mainly analyzed，the variation of the mechanical properties of corroded steel was compared and analyzed under static and cyclic loading，the effect of corrosion degree on hysteretic behavior was clarified，and the cyclic constitutive model of corroded steel was established. Results showed that the hysteresis curves of corroded steel remain smooth and full，while the dissipation capacity linearly decreases with the mass loss，with a maximum decrease rate of up to 15.51%. The degradation of the energy dissipation and plastic deformation capacities caused by mass loss also becomes more significant with the increase in cyclic numbers. When the mass loss rate is greater than 0.12，the strain of the hardening point of the compression skeleton curves decreases from 0.6% to 0.3%，with a decrease of up to 50%. The tension skeleton curves also exhibit the same degradation condition. Moreover，cyclic loading significantly decreases the deformability of steel(i.e.，the ultimate strain and elongation decrease by 36.47% and 8.88%，respectively)but has only a slight influence on the ultimate and fracture strengths. Furthermore，given that the traditional Ramberg-Osgood model cannot determine the yield stage of steel and cannot accurately estimate the yield load，the three-stage skeleton curve is employed to plot the elastic，yield，and hardening stages. According to the test，the unloading stage is determined to be linear，and the quantitative relationship between unloading stiffness，cyclic strain，and mass loss rate is established. Finally，considering corrosion damage and cyclic strain，the analytical formula for the reloading stage is clarified. Based on this，the general hysteresis institutive model with different mass losses is established，and the accuracy of this model is verified by comparing it with the test. Therefore，an evaluation method of hysteretic behavior for corroded steel is provided in the field of engineering. © 2023 Tianjin University. All rights reserved.
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页码：471 / 480
页数：9
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