Study on low-cycle fatigue properties of bimetallic steel bar considering buckling

被引：0
|
作者：
Hua J. [1 ,2 ]
Wang F. [1 ]
Xue X. [1 ,2 ]
Ding Z. [1 ]
Huang L. [1 ,2 ]
机构：
[1] School of Civil Engineering, Chongqing University, Chongqing
[2] Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education, Chongqing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 06期
关键词：
bimetallic steel bar; buckling; energy dissipation capacity; low-cycle fatigue behavior; numerical simulation;
D O I：
10.14006/j.jzjgxb.2022.0634
中图分类号：
学科分类号：
摘要：
When RC structures are subjected to earthquake, the longitudinal steel bars in the key parts could easily buckle, resulting earlier fatigue failure. To evaluate the effect of buckling on the low-cycle fatigue behavior of bimetallic steel bars(BSBs), low-cycle fatigue tests considering four slenderness ratios were carried out, and the σ-ε hysteretic curves of the specimens were obtained. On this basis, the effect of buckling on the hysteretic curve shape, stress-strain behavior and energy dissipation capacity of BSBs was analyzed. The numerical simulation of the low-cycle fatigue behavior of the BSBs considering the effect of buckling was realized by OpenSees. The results show that an evident pinch appears in the hysteretic curve when the slenderness ratio of the BSBs is greater than 9. The peak compressive stress decreases with the increase of loading cycles, and the increase of strain amplitude significantly increases the decline rate of the peak compressive stress. Buckling reduces the energy dissipation of hysteresis loop and fatigue life of the specimens, indicating detrimental effect on the fatigue behavior of BSBs. The proposed model can effectively simulate the asymmetry of the peak tensile and compressive stresses caused by buckling. © 2023 Science Press. All rights reserved.
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页码：129 / 137
页数：8
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