Failure of deformed bars subjected to the repeat loading of large deformation in the plastic buckling region

变形钢筋在塑性屈曲区域受到大变形重复载荷的破坏

• 批准号: 13650504
• 负责人: HIGAI Takeshi
• 金额: $ 2.24万
• 依托单位: University of Yamanashi
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650504/
• 关键词: Deformed bar; Plastic deformation; Buckling; Repeated loading; Failure criteria; FEM; Stress - strain relation

The aims of this project are (1) examining the mechanical behavior of the reinforcing bars subjected to the repeated loading of very large forced axial deformation in the plastic buckling region, and get the hysteresis model of the bars which can be used for the finite element analysis. And, (2) study the failure criteria of the bars under such loading conditions.Related to (1), mechanical behavior was studied by FEM analysis with fiber model and based on the finite deformation theory. Then, a practical and accurate hysteresis model of the stress-strain relationship was developed based on the analytical results above.Related to (2), repeated loading tests of about a hundred of D19 deformed bars were done using fatigue test machine with hydraulic pressure grips. The range of forced axial deformation was from tensile yield region to compressive plastic buckling region. Changing the fixed length of the bar specimen into 18d, 12d and 6d (d: diameter of the bar), and changing the amplitude of forced deformation into 23 cases, the relationship between the number of repetition of loading and fixed length, average compressive strain and average tensile strain was studied statistically.

本课题的主要目的是（1）研究钢筋在塑性屈曲区承受大轴向强迫变形的重复荷载作用下的力学行为，得到可用于有限元分析的钢筋滞回模型。（2）研究了在这种加载条件下钢筋的破坏准则。与（1）相关的是，基于有限变形理论，采用纤维模型对钢筋的力学性能进行了有限元分析。在此基础上，建立了一个实用的、精确的应力-应变关系的滞后模型。与（2）相关的是，在液压夹具疲劳试验机上对近百根D19变形钢筋进行了重复加载试验。受迫轴向变形范围从拉伸屈服区到压缩塑性屈曲区。将试件固定长度分别改变为18 d、12 d和6d（d为试件直径），强迫变形幅值改变为23种情况，统计分析了加载重复次数与固定长度、平均压应变和平均拉应变的关系。

项目成果

田上和也, 外3名: "繰り返し荷重を受ける鉄筋の座屈モデルに関する研究"構造工学論文集. 47A. 725-733 (2001)

Kazuya Tagami 等 3 人：“重复荷载作用下钢筋的屈曲模型研究”《结构工程杂志》47A 725-733 (2001)。

田上和也外3名: "繰り返し荷重を受ける鉄筋のモデルに関する研究"構造工学論文集. 47A. 725-733 (2001)

Kazuya Tagami 和其他 3 人：“重复载荷下钢筋模型的研究”《结构工程杂志》47A 725-733 (2001)。

田上和也, 外3名: "座屈を考慮した鉄筋の繰り返し履歴モデル"コンクリート工学年次論文集. 24・2. 223-228 (2002)

Kazuya Tagami 等 3 人：“考虑屈曲的钢筋重复历史模型”，混凝土工程年报 24・2（2002 年）。

Kazuya Tanoue: "Modeling of stress-average strain relationship of buckled reinforcing bars under cyclic loading"Proc. of Japan Concrete Institute. Vol. 24, No. 2. 223-228 (2002)

Kazuya Tanoue：“循环载荷下屈曲钢筋的应力-平均应变关系建模”Proc。

Kazuya Tanoue: "Modeling of nonlinear cyclic behavior of buckled reinforcing bars"Journal of Structural Engineering. Vol. 47A. 725-733 (2001)

Kazuya Tanoue：“屈曲钢筋的非线性循环行为建模”结构工程杂志。