Fatigue life prediction model of corroded studded steel-concrete composite beam

被引：0
|
作者：
Kuang Y. [1 ]
Tao L. [1 ]
He Y. [2 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] Changsha High-tech Holdings Group, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Corroded studs; Corrosion rates; Fatigue life; Numerical analysis; Steel-concrete composite beams;
D O I：
10.11817/j.issn.1672-7207.2021.03.011
中图分类号：
学科分类号：
摘要：
A model for predicting the fatigue life of steel-concrete composite beams with corroded studs was proposed by combining the finite element analysis software ANSYS and theoretical formulas. According to the principle of fatigue failure of steel-concrete composite beams in actual tests, it was proposed that the studs of composite beams would withdraw from work in the process of fatigue loading. At the same time, the stud fatigue life prediction model and the calculation formula of the stud residual bearing capacity were combined with numerical analysis to calculate the fatigue life of composite beams considering fatigue loading amplitude, upper limit of fatigue loading, ultimate bearing capacity of the stud, diameter of the stud, bolt stud nail initial defects on the fatigue life of composite beams. Firstly, the fatigue life of the steel-concrete composite beam with uncorroded studs was predicted. On the basis of verifying the validity of the model, the finite element analysis model of the composite beam was modified considering the influence of the corrosion rate on the ultimate strength, yield strength, elastic modulus, section diameter and constitutive relationship of the studs. Combined with the fatigue life prediction model of corroded studs, the fatigue life of steel-concrete composite beam with corroded studs was predicted. The results show that the fatigue life prediction model proposed in this paper is used to predict the fatigue life of composite beam specimens FSCB-4 and FSCB-5, and the error between the calculated results and the test results are 12.3% and 6.95% respectively. Compared with the traditional S-N curve analysis method, it has higher accuracy and is more consistent with the test value. The corrosion of studs has a great influence on the fatigue life of steel-concrete composite beams. When the corrosion rates of studs are 5%, 10%, 15% and 20%, the fatigue life of composite beams decreases by 11.51%, 25.27%, 48.08% and 79.65% respectively. © 2021, Central South University Press. All right reserved.
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页码：770 / 778
页数：8
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