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.

提出了混凝土和岩石裂缝扩展的一般分析方法。建立了具有位移不连续的有限元模型。沿不连续面满足张力-软化关系，并判断从张力-软化路径分岔到卸载路径。因此，裂纹的局部化，例如在弯曲下没有初始缺口的梁中，可以通过所提出的方法捕获。以缺口梁的弯曲试验为例，提出了一种从荷载-位移曲线中确定拉伸-软化曲线的反分析方法。拉伸-软化曲线表示材料在拉伸断裂时的性能。直接拉伸试验的难度较大，该方法解决了断裂力学实际应用中存在的问题。基于已发展的张力软化曲线分析方法和反分析方法，提出了一种钢纤维混凝土隧道衬砌的设计方法。根据混凝土的断裂力学原理对截面承载力进行了估算。

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，

H.Horii and Y.Okui: "“Thermomechanics and micromechanics-based continuum theory for localization phenomena"" Proceedings of IUTAM Symposium on Fracture of Brittle Disordered Materials. (1993)

H. Horii 和 Y. Okui：“基于热力学和微力学的局域化现象连续体理论”，IUTAM 脆性无序材料断裂研讨会论文集（1993 年）。

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。

M.Cai and H.Horii: "Constitutive model and FEM analysis of jointed rock masses" Int.J.Rock Mech.Min.Sci.& Geomech.Abstr.30. 351-359 (1993)

M.Cai 和 H.Horii：“节理岩体的本构模型和有限元分析”Int.J.Rock Mech.Min.Sci。

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）。