杨红, 蒋惠, 冉小峰. HRB600钢筋屈曲受力性能试验研究[J]. 工程力学, 2022, 39(6): 83-98. DOI: 10.6052/j.issn.1000-4750.2021.03.0198
引用本文: 杨红, 蒋惠, 冉小峰. HRB600钢筋屈曲受力性能试验研究[J]. 工程力学, 2022, 39(6): 83-98. DOI: 10.6052/j.issn.1000-4750.2021.03.0198
YANG Hong, JIANG Hui, RAN Xiao-feng. EXPERIMENTAL RESEARCH ON THE BUCKLING BEHAVIOR OF HRB600 STEEL BARS[J]. Engineering Mechanics, 2022, 39(6): 83-98. DOI: 10.6052/j.issn.1000-4750.2021.03.0198
Citation: YANG Hong, JIANG Hui, RAN Xiao-feng. EXPERIMENTAL RESEARCH ON THE BUCKLING BEHAVIOR OF HRB600 STEEL BARS[J]. Engineering Mechanics, 2022, 39(6): 83-98. DOI: 10.6052/j.issn.1000-4750.2021.03.0198

HRB600钢筋屈曲受力性能试验研究

EXPERIMENTAL RESEARCH ON THE BUCKLING BEHAVIOR OF HRB600 STEEL BARS

  • 摘要: HRB600高强钢筋已纳入我国钢筋产品国家标准,并商业化生产,但关于其非弹性屈曲受力性能、考虑屈曲的低周疲劳损伤模型的研究成果很少。对于HRB600高强钢筋的原状试件,该文完成了10个单调受压屈曲试验、16个考虑屈曲的循环拉压试验,测量了屈曲钢筋的平均应力-平均应变曲线和跨中横向位移,分析了非弹性屈曲对HRB600钢筋受压强度退化的影响,以及屈曲方向对试件强度退化、疲劳损伤的影响,提出了适用于HRB600高强钢筋、可考虑屈曲效应和不同加载方式影响的修正低周疲劳损伤模型。研究结果表明:单调受压屈曲时HRB600钢筋屈曲方向稳定,随长径比增大钢筋屈曲后强度退化加快;循环加载时HRB600钢筋屈曲方向不稳定,导致局部塑性应变集中和疲劳损伤对钢筋屈曲后强度退化的不利影响减轻;传统低周疲劳损伤模型明显低估了HRB600钢筋屈曲后的疲劳损伤,修正疲劳损伤模型能合理地考虑屈曲对HRB600钢筋低周疲劳损伤和断裂的影响。

     

    Abstract: HRB600 high-strength steel bars have been included in the national standard of steel products in China and have been commercially produced. However, there is few research related to the inelastic buckling behavior of HRB600 steel bars or the low cycle fatigue damage model considering buckling. Focused on the undisturbed specimens of HRB600 high-strength steel bars, ten monotonic compression buckling tests and 16 tension and compression cyclic loading tests considering buckling were conducted. The average stress-strain curves and mid-span transverse displacements of buckled specimens were measured. The influence of inelastic buckling on the compressive strength deterioration of the HRB600 steel bars, and the influence of buckling direction on the strength deterioration and fatigue damage of the steel bars were analyzed. A modified low-cycle fatigue damage model suitable for HRB600 high-strength steel bars was proposed, which can consider the effect of buckling and different loading methods. The results show that the buckling direction of the HRB600 steel bars is stable under monotonic compression, and the strength deterioration is faster for larger slenderness ratios. The buckling direction of the HRB600 steel bar is unstable under cyclic loading, making the local plastic strain concentration and fatigue damage have less adverse effects on the post-buckling strength deterioration of the bars. The traditional low cycle fatigue damage model obviously underestimates the fatigue damage of buckled HRB600 steel bars, while the influence of buckling on the fatigue damage and fracture of HRB600 steel bars can be reasonably considered by the modified low-cycle fatigue damage model.

     

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