Standardization of Testing Method for Tension Softening Diagrams of Concrete through Inverse Analysis and Applications

反演分析及应用混凝土拉伸软化图测试方法标准化

• 批准号: 09555136
• 负责人: ROKUGO Keitetsu
• 金额: $ 2.24万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555136/
• 关键词: Concrete; Tension softening diagram; Inverse Analysis; Standardization; Fracture Mechanics

In this study, we intended to establish a testing method for determination of tension softening diagrams of concrete based on discussions with researchers in the world. We evaluated the properties of steel fiber reinforced concrete and recycled aggregate concrete using the determined tension softening diagrams. In addition, the bond properties of concrete were also evaluated through the diagrams.The program of Finite Element Inverse Analysis for the accurate determination of the tension softening diagrams from experimental load- displacement curves of concrete beam specimens has been proposed in the report of the subcommittee on size effect (chairman : K.Rokugo) under JSCE concrete committee. The preferable conditions for the shape and size of beam specimens and for the measurements of displacement were indicated. An example of the loading apparatus for the stable measurement of load- displacement curves was also shown.The international workshop on the establishment of testing methods for the diagrams and applications was held in Gifu in October 1998. It was agreed in the workshop that the applicability of the tension softening diagrams is superior. to other fracture mechanics parameters and that the simplification of the diagrams should be taken depending on the applications. It was recommended that a technical committee on the standardization of the testing methods for the diagrams should be made in RILEM as well as JCI in Japan.It was found in this study that the diagrams were effective for the performance evaluation of steel fiber reinforced concrete differing in sorts of fibers, fiber contents and mortar matrix strength. It was pointed out that the shape of the diagrams did not depend on the specimen sizes, when the fiber content was less than 2 % by volume. The flexural fracture behavior of recycled aggregate concrete could be well distinguished through the shapes of the tension softening diagrams.

本研究在与国内外学者讨论的基础上，试图建立一种测定混凝土拉伸软化曲线的试验方法。我们评估的性能钢纤维混凝土和再生骨料混凝土使用确定的拉伸软化图。JSCE混凝土委员会的尺寸效应小组委员会（主席：六乡光一）的报告中提出了由混凝土梁试件的试验荷载-位移曲线精确确定混凝土拉伸软化曲线的有限元反分析程序。指出了梁试件的形状、尺寸和位移测量的最佳条件。此外，还介绍了用于稳定测定载荷-位移曲线的加载装置的实例。1998年10月在岐阜市举办了关于建立图表和应用的测试方法的国际研讨会。研讨会上一致认为，拉伸软化图的适用性是上级。断裂力学参数之间的关系，并根据应用情况对图解进行简化。建议RILEM和日本JCI共同成立一个技术委员会，对试验方法进行标准化，试验结果表明，该试验方法对不同纤维种类、纤维掺量和砂浆强度的钢纤维混凝土的性能评价是有效的。指出当纤维含量小于2%（体积）时，曲线形状与试样尺寸无关。再生骨料混凝土的弯曲断裂行为可以通过拉伸软化曲线的形状得到很好的区分。

项目成果

六郷恵哲 ほか(共著): "コンクリートの寸法効果と引張軟化曲線" 土木学会コンクリート委員会寸法効果小委員会, 92 (1997)

Keitetsu Rokugo 等人（合著者）：“混凝土的尺寸效应和拉伸软化曲线”日本土木工程师学会混凝土委员会尺寸效应小组委员会，92 (1997)

清水 大輔: "コンクリートの引張軟化特性に及ぼす骨材の影響" コンクリート工学年次論文報告集. Vol.20 No.3. 157-162 (1998)

Daisuke Shimizu：“骨料对混凝土拉伸软化性能的影响”混凝土工程年报第 20 卷第 157-162 期（1998 年）。

清水大輔: "コンクリートの引張軟化特性に及ぼす骨材の影響" コンクリート工学年次論文報告集. Vol.20,No.3. 157-162 (1998)

Daisuke Shimizu：“骨料对混凝土拉伸软化性能的影响”混凝土工程年报第 20 卷，第 3 期（1998 年）。

橘高 義典: "セメント系複合材料の引張軟化曲線の標準試験方法についての一考察" コンクリート工学年次論文報告集. Vol.19 No.2. 27-32 (1997)

Yoshinori Tachibana：“水泥基复合材料拉伸软化曲线标准试验方法的研究”混凝土工程年论文集第19卷第27-32期（1997年）。

N.KURIHARA: "Evaluation of Properties of Steel Fiber Reinforced Concrete by means of Tension Softening Diagrams" Fracture Mechanics of Concrete Structures. Vol.1. 465-476 (1998)

N.KURIHARA：“通过拉伸软化图评估钢纤维混凝土的性能”混凝土结构的断裂力学。