Establishment of analysis method for crack growth in concrete and rock

混凝土与岩石裂纹扩展分析方法的建立

• 批准号: 04555106
• 负责人: HORII Hideyuki
• 金额: $ 3.52万
• 依托单位: UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555106/
• 关键词: Fracture mechanics; Crack growth analysis; Tension-softening curve; Rock; Concrete; Tunnel lining; Design method; 逆解析; 鋼繊維補強コンクリート; トンネル覆工; 境界要素法; 有限要素法; コンクリ-ト; レ-ザ-スペックル法; 引張試験; 曲げ試験

A general analysis method for crack growth in concrete and rock is developed. A finite element with displacement discontinuities is formulated. Along the discontinuities a tension-softening relationship is satisfied and bifurcation into the unloading path from the tension-softening path is judged. As a result, the localization of cracking, for example in a beam without an initial notch under bending, can be captured by the proposed method.A back analysis method is developed to determine the tension-softening curve from a load-displacement curve obtained in, for example, a bending test of a notched beam. The tension-softening curve represents material properties on tensile fracture. Direct tension test is difficult to conduct, and the proposed method provides a solution to the problems in the practical application of fracture mechanics.Based on the developed analysis method and back analysis method for tension-softeing curve, a design method of tunnel lining with SFRC (steel fiber reinforced concrete) is proposed. The cross-sectional capacity is estimated based on fracture mechanics of concrete.

开发了混凝土和岩石中裂纹扩展的通用分析方法。公式化了具有位移不连续性的有限元。沿着不连续性，满足张力软化关系，并判断从张力软化路径分叉到卸载路径。因此，可以通过所提出的方法捕​​获裂纹的局部化，例如在弯曲下没有初始缺口的梁中。开发了一种反分析方法，用于根据在例如，缺口梁的弯曲测试。拉伸软化曲线代表材料在拉伸断裂时的性能。直接拉伸试验难以进行，该方法为断裂力学实际应用中的问题提供了解决方案。基于发展的拉力-软化曲线分析方法和反分析方法，提出了钢纤维混凝土隧道衬砌设计方法。提出了（钢纤维混凝土）。横截面承载力是根据混凝土断裂力学估算的。

项目成果

Y.Okui,H.Horii,N.Akiyama: "A micromechanics-based continuum theory for strain localization and softening under compression" Fracture Mechanics of Concrete Structures,Proc.of First Int.Conf.on Fracture Mechanics of Concrete Structures,June,1-5,1992. 275-28

Y.Okui，H.Horii，N.Akiyama：“基于微观力学的应变局部化和压缩软化的连续体理论”混凝土结构断裂力学，Proc.of First Int.Conf.on Fracture Mechanics of Concrete Structures，6月，

S.Nironalendran,H.Horii: "Analytical modeling of microcracking and bridging in the fracture of quasi-brittle materials" Journal of Medrauics and Physics of Solids. 40. 863-886 (1992)

S.Nironalendran，H.Horii：“准脆性材料断裂中微裂纹和桥接的分析模型”Medrauics 和固体物理学杂志。

Kabele,P., 山口栄輝, 堀井秀之: "有限要素法と境界要素法の重ね合わせに基づくコンクリート構造の数値解析手法" 構造工学論文集. Vol.39A. 343-350 (1993)

Kabele，P.，Eiki Yamaguchi，Hideyuki Horii：“基于有限元法和边界元法叠加的混凝土结构数值分析方法”，《结构工程学报》第 39A 卷（1993 年）。

H.Horii: ""Micromechanics and localization in concrete and rock"" Proceedings of the 2nd International conference on "Fracture and Damage of Concrete and Rock". Nov.9-13,1992, Vienna, Austria, E & FNSPON,London. 54-56 (1993)

H.Horii：“混凝土和岩石中的微观力学和定位”第二届“混凝土和岩石的断裂与损坏”国际会议论文集。

P.Kabele, E.Yamaguchi, and H.Horii: ""Analysis of concrete structures by FEM-BEM superposition method"" Computational Mechanics (ed.by Valliappan, Pulmano & Tin-Loi). Balkema, Rotterdam. 763-768 (1993)

P.Kabele、E.Yamaguchi 和 H.Horii：“通过 FEM-BEM 叠加法分析混凝土结构”计算力学（Valliappan、Pulmano 编辑）