MESOSCOPIC STRUCTURAL ANALYSIS OF NONLINEAR MECHANICAL PROPERTIES OF CONCRETE

混凝土非线性力学性能的细观结构分析

• 批准号: 05650429
• 负责人: TSUBAKI Tatsuya
• 金额: $ 1.47万
• 依托单位: YOKOHAMA NATIONAL UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650429/
• 关键词: Concrete; Nonlinear Mechanical Property; Mesoscopic Structure; Fracture; Numerical Analysis; Simulation; Parallel Computation; Finite Element Method; 力学特性; 非線形性; 構造解析

The following numerical analysis and experiment were conducted in this study to develop a numerical simulation method for the analysis of the nonlinear mechanical behavior of concrete at failure considering the effect of its mesoscopic structure.1. Development of numerical analysis method :A numerical analysis method using microscopic unit elements was developed to simulate the failure behavior of concrete. A microscopic unit element is composed of two rigid blocks connected by nonlinear springs in the normal and tangential directions at the interface. The present method has the advantages of both the method using composite elements called concrete element and the distinct element method. It was confirmed through numerical simulations that the present method is effective to analyze the nonlinear mechanical behavior of concrete at failure including the strain softening.2. Investigation of computational efficiency of numerical analysis method :It was confirmed that the use of the parallel computational technique with the domain decomposition method is effective to reduce the computation time.Experiment of model concrete specimen to examine the numerical analysis method :Uniaxial compression tests of two-dimensional model concrete specimens using steel cylinders for aggregates were conducted to examine the appropriateness of the present numerical method. The influence of the factors such as the shape, the size and the allocation of aggregate, the bond between aggregate and mortar, and the strength of mortar on the stress-strain relationship and the failure mode became clear from the test results.Applying the present numerical analysis method to larger problems and making it more practical may be considered as the extension of the present study.

本文通过数值分析和试验研究，建立了考虑细观结构影响的混凝土破坏非线性力学行为的数值模拟方法.数值分析方法的发展：提出了一种用细观单元模拟混凝土破坏行为的数值分析方法。微观单元是由两个刚性块体在界面处的法向和切向通过非线性弹簧连接而成。该方法兼有混凝土组合单元法和离散单元法的优点。数值模拟结果表明，该方法可以有效地分析混凝土破坏时的非线性力学行为，包括应变软化.数值分析方法的计算效率研究：通过区域分解法的并行计算，可以有效地缩短计算时间。数值分析方法的模型混凝土试件试验研究：为了验证数值分析方法的合理性，进行了以钢圆筒为骨料的二维模型混凝土试件的单轴压缩试验。试验结果揭示了骨料形状、骨料尺寸、骨料与砂浆的粘结强度、骨料的配比等因素对应力-应变关系和破坏形态的影响，将数值分析方法应用于更大的问题，使其更符合实际，可以作为本研究的延伸。

项目成果

椿 龍哉: "微小構造単位要素のモデル化と材料特性のシミュレーション" 構造工学における数値解析法シンポジウム論文集. 18. 465-470 (1994)

Tatsuya Tsubaki：“微观结构单元单元的建模和材料特性的模拟”结构工程数值分析方法研讨会论文集。18. 465-470 (1994)。

TSUBAKI,Tatsuya(椿 龍哉): "Numerical Simulation of Intermal Failure Behavior of Concrete Related to Creep under Compression" Transactions of the Japan Concrete Institute. Vol.16. 123-130 (1994)

TSUBAKI, Tatsuya：“与压缩下蠕变相关的混凝土内部失效行为的数值模拟”，日本混凝土协会学报，第 16 卷（1994 年）。

T.Tsubaki and M.A.M.Abdeen :"Numerical Simulation of Internal Failure Behavior of Concrete Related to Creep under Compression" Transactions of the Japan Concrete Institute. Vol.16. 123-130 (1994)

T.Tsubaki 和 M.A.M.Abdeen：“与压缩下蠕变相关的混凝土内部失效行为的数值模拟”日本混凝土协会会刊。

T.Tsubaki :"Numerical Simulation of Deformational Properties of Concrete by Using Microstructural Unit Elements" Proc.of the Japan Concrete Institute. Vol.17 (in press). (1995)

T.Tsubaki：“使用微结构单元单元对混凝土变形特性进行数值模拟”，日本混凝土研究所论文集。

T.Tsubaki :"Modeling of Microscopic Structural Element and Simulation of Material Property" Proc.of Symposium on Computational Methods in Structural Engineering and Related Fields. Vol.18. 465-470 (1994)

T.Tsubaki：“微观结构单元建模和材料性能模拟”结构工程及相关领域计算方法研讨会论文集。