Measurement System of Low Cycle Fatigue Parameters Applicable to Large Scale Structural Members

适用于大型结构构件的低周疲劳参数测量系统

• 批准号: 11555121
• 负责人: TATEISHI Kazuo
• 金额: $ 4.93万
• 依托单位: Nagoya University (2000)The University of Tokyo (1999)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555121/
• 关键词: low cycle fatigue; strain; image analysis; concrete filled steel tube; stereo vision; thermography; ステレオビジュン

This study aimed at development of measurement system of low cycle fatigue parameters applicapble to large-scale structural specimens. As a first step, strain measurement system based on image analysys and stereography was newly developed, because the main parameter for estimating low cycle fatigue strength was plastic strain in material. This newly developed system made it possible to measure large strain field of a structural member even if three-dimensiccnal deformation like buckling deformation occurred, which couldn't be measured by conventional method like strain gauge ethod. The procedures to detemine the correlation between two images and trace the targets points could be performed automatically, and the strain results could be obtained in a few seconds. This system was applied to loading test carried out on concrete filled steel tube specimen in large scale. By this system, crack initiation and propagation behaviors where the most critical damage occurred in the specimen could be estimated. In addition, the effects of dimensions of the member and loading conditions on local strain field could also be estimated.

本研究旨在开发适用于大型结构试件的低周疲劳参数测试系统。由于材料的塑性应变是评价材料低周疲劳强度的主要参数，本文首先开发了基于图像分析和体视学的应变测量系统。这种新开发的系统使得即使发生三维变形（如屈曲变形）也能测量结构构件的大应变场，而这是用应变片法等常规方法所不能测量的。该方法可以自动完成两幅图像之间的相关性判断和目标点的跟踪，在几秒钟内就可以得到应变结果。该系统已应用于大尺寸钢管混凝土试件的加载试验。通过该系统，可以估计裂纹的萌生和扩展行为的最关键的损伤发生在试样中。此外，还可以估计构件尺寸和加载条件对局部应变场的影响。

项目成果

斉藤智也,舘石和雄: "CFT部材の鋼管のひずみ挙動に関する考察"コンクリート工学年次論文集. Vol.22,No.3. 1045-1050 (2000)

Tomoya Saito、Kazuo Tateishi：“钢管作为 CFT 构件的应变行为研究”混凝土工程年刊第 22 卷，第 1045-1050 期（2000 年）。

K.Tateishi,T.Saito and K.Murata : "Low Cycle Fatigue of Concrete Filled Steel Tube Members"Structural Failure and Plasticity (IMPLAST2000). 679-684 (2000)

K.Tateishi、T.Saito 和 K.Murata：“钢管混凝土构件的低周疲劳”结构失效和塑性 (IMPLAST2000)。

K.Tateishi and K.Murata: "Strain Behavior of Concrete Filled Steel Tube Members under Cyclic Loading"The Seventh East Asia-Pacific Conference on Structural Engineering & Construction. (1999)

K.Tateishi 和 K.Murata：“循环荷载下钢管混凝土构件的应变行为”第七届东亚太平洋结构工程会议

K.Tateishi, T.Saito and K.Murata: "Low Cycle Fatigue of Concrete Filled Steel Tube Members"Structural Failure and Plasticity (IMPLAST2000). (2000)

K.Tateishi、T.Saito 和 K.Murata：“钢管混凝土构件的低周疲劳”结构失效和塑性 (IMPLAST2000)。

K.Tateishi,T.Saitoh,K.Murata: "Low Cycyle Fatigue of Concrete Filled Steel Tube Members"Proc.of the IMPLAST 2000. (発表予定). (2000)

K.Tateishi、T.Saitoh、K.Murata：“钢管混凝土构件的低循环疲劳”Proc.of the IMPLAST 2000。（待提交）。