A STUDY ON THE POST-LOCAL-BUCKLING FRACTURE OF CONCRETE FILLED CIRCULAR TUBES UNDER CYCLICLOADING

循环荷载作用下圆管混凝土局部屈曲后断裂研究

• 批准号: 10650567
• 负责人: KAWANO Akihiko
• 金额: $ 2.18万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650567/
• 关键词: CONCRETE FILLED TUBE; LOCAL BUCKLING; FRACTURE; CYCLICLOADING; SCALE EFFECT; AXIAL LOAD FLUCTUATION

The first objective of this report is to reveal the scale effect on the fracture following local bucking of concrete-filled circular tubular members (CFT members). The second objective is to investigate the fracture mode of CFT beam-columns subjected to the fluctuating axial loads as well as the repeated horizontal loads. In 1998, An experimental work for the first objective was completed. The specimens were CFT members with the diameter of 355mm or 216mm, either of which represented the full scale beam-column or the full scale bracing member, respectively. The specimen was subjected to the cyclic bending under a constant amplitude of the curvature until the fracture. The comparison with the previous small scale specimens suggested that the scale effect would be negligible for CFT members at least within 355 mm in diameter. Accordingly, the fracture prediction method which had been developed by the authors from the small scale specimens may apply to the full scale CFT members. In 1999, a cyclic loading test for CFT columns in which the axial loads varied in proportion to the alternatively repeated horizontal loads was completed as the second objective of this report. The axial loads had a zero average and fluctuated with the amplitude of +/-20% to 40% of the compressive strength. The experiment demonstrated that the collapse mode of CFT columns subjected to fluctuating axial loads was basically the breaking fracture following local buckling of tubes; and , therefore, the authors fracture prediction method was applicable to those. However, the further experimental study should be required, so that the present experiment has a limit to the condition of axial fluctuation or the material properties of CFT specimens; and the information is deficient for the fracture in the small strain amplitudes which is ordinary for beam-column members.

本报告的第一个目标是揭示混凝土填充圆管构件（CFT 构件）局部屈曲后断裂的尺度效应。第二个目标是研究 CFT 梁柱在脉动轴向荷载和重复水平荷载作用下的断裂模式。 1998年，完成第一个目标的实验工作。试件为直径为355mm或216mm的CFT构件，分别代表全尺寸梁柱或全尺寸支撑构件。将试样在恒定曲率幅度下进行循环弯曲直至断裂。与之前的小尺度样本的比较表明，对于直径至少在 355 mm 以内的 CFT 构件，尺度效应可以忽略不计。因此，作者根据小尺寸样本开发的断裂预测方法可以适用于全尺寸 CFT 构件。 1999年，完成了CFT柱的循环加载试验，其中轴向载荷与交替重复的水平载荷成比例变化，作为本报告的第二个目标。轴向载荷的平均值为零，并以抗压强度的+/-20%至40%的幅度波动。试验表明，在脉动轴向荷载作用下，CFT柱的倒塌模式基本上是管材局部屈曲后的断裂断裂；因此，作者的断裂预测方法适用于这些。但仍需进一步的实验研究，使得本实验对轴向波动条件或CFT试件的材料性能有一定的限制；对于梁柱构件常见的小应变幅断裂，信息缺乏。

项目成果

木村俊之、河野昭彦、松井千秋: "実大コンクリート充填鋼管柱の局部座屈後破断則に関する研究"日本建築学会九州支部研究報告. 38. 577-580 (1999)

木村俊之、河野明彦、松井千秋：“全尺寸钢管混凝土柱局部屈曲后的破裂规律研究”日本建筑学会九州分会研究报告38。577-580（1999）。

田中幸仁,河野昭彦,松井千秋,木村俊之: "実大コンクリート充填鋼管柱の局部座屈後破断則に関する研究 その2 荷重条件の影響"日本建築学会九州支部研究報告. 39. 573-576 (2000)

田中幸仁、河野明彦、松井千秋、木村敏之：《全尺寸钢管混凝土柱局部屈曲断裂规律研究第2部分：荷载条件的影响》日本建筑学会九州分会研究报告39。 573-576（2000）

木村俊之、河野昭彦、松井千秋、田中幸仁: "実大コンクリート充填鋼管柱の局部座屈後破断の実験研究"日本建築学会大会学術講演梗概集. 構造C-1. 1267-1268 (1999)

Toshiyuki Kimura、Akihiko Kono、Chiaki Matsui、Yukihito Tanaka：“全尺寸混凝土钢管柱局部屈曲后断裂的实验研究”日本建筑学会会议论文集 C-1（1999 年）。 ）

木村俊之,河野昭彦 他: "実大コンクリート充填鋼管部の局部座屈後破断則に関する研究" 日本建築学会九州支部研究報告集. 38 印刷中. (1999)

Toshiyuki Kimura、Akihiko Kono等：“全尺寸混凝土钢管局部屈曲断裂规律研究”日本建筑学会九州分会研究报告38（1999年）。

Y. TANAKA, A. KAWANO, C. MATSUI AND T. KIMURA: "A STUDY ON THE POST-LOCAL-BUCKLING FRACTURE OF FULL SCALED CFT COLUMNS, RESEARCH REPORTS OF KYUSHU BRANCH MEETING"ARCHITECTURAL INSTITUTE OF JAPAN. VOL.39. 573-576 (2000)

Y. TANAKA、A. KAWANO、C. Matsui 和 T. Kimura：“全尺寸 CFT 柱局部屈曲断裂研究，九州分会会议研究报告”日本建筑学会。