Shear Behavior in Fracture Process Zone of Concrete

混凝土断裂过程区的剪切行为

• 批准号: 10650557
• 负责人: SHINOHARA Yasuji
• 金额: $ 1.28万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650557/
• 关键词: Concrete; Fracture Process Zone; Shear Behavior; Shear Retention Factor; Crack Width; Shear Displacement; Normal Load; ひび割れたコンクリート

Most cracks in concrete structures are initiated first by the largest principle stress, and propagate under subsequent shear and transverse compression or tension. A biaxial testing device, with which the vertical and horizontal load as well as displacement can be independently controlled by closed-loop servo systems, has been developed in order to establish the shear behavior in cracked concrete. The shear tests on specimens containing narrow cracks (fracture process zone introduced by the tensile test in displacement control) have been carried out maintaining either normal displacement or load across the crack surface constant. The relation of normal and shear stresses to crack opening and sliding displacements was discussed and distinguished by the boundary conditions of the normal direction across the crack surface. Several expressions which give shear retention factor, β, and relations between shear displacement and normal load in cracks have been derived based on biaxial test results.

混凝土结构中的大多数裂缝首先由最大主应力引发，并在随后的剪切和横向压缩或拉伸下扩展。为了研究开裂混凝土的抗剪性能，研制了一种双轴试验装置，该装置的垂直和水平荷载以及位移可由闭环伺服系统独立控制。对含有窄裂纹（位移控制中拉伸试验引入的断裂过程区）的试样进行了剪切试验，保持裂纹表面的法向位移或载荷恒定。讨论了正应力和剪应力与裂纹张开度和滑移量的关系，并通过裂纹面法线方向的边界条件进行了区分。根据双轴试验结果，推导出了裂缝中剪切保持因子β和剪切位移与法向荷载关系的表达式。

项目成果

石飛幸子: "コンクリートのひび割れ面におけるせん断変位と垂直荷重の関係 その1 せん断試験方法"日本建築学会大会学術講演梗概集. [A-1]. 715-716 (1999)

Sachiko Ishitobi：“混凝土裂纹表面上的剪切位移与垂直荷载的关系，第 1 部分：剪切试验方法”日本建筑学会会议记录 [A-1]（1999 年）。

金子葉: "コンクリートの破壌進行領域におけるせん断挙動に関する研究 その2 ひび割れによるせん断剛性の低下"日本建築学会大会学術講演梗概集. [A-1]. 1047-1048 (1998)

Kaneko Yo：“断裂进展区域的混凝土剪切行为研究，第 2 部分：由于开裂导致的剪切刚度降低”日本建筑学会会议学术讲座摘要 [A-1]。

篠原保二: "垂直方向変位制御下におけるコンクリートのせん断変位と垂直荷重の関係"コンクリート工学年次論文報告集. 21・2. 655-660 (1999)

筱原靖二：“垂直位移控制下混凝土的剪切位移与垂直荷载的关系”混凝土工程年论文集21・2（1999）。

Yasuji SHINOHARA: "compressive Shear Behavior in Fracture Process Zone of Concrete"Journal of Structural and Construction Engineering (Transaction o AIJ). No. 525. 1-6 (1999)

Yasuji Shininohara：“混凝土断裂过程区的压缩剪切行为”结构与建筑工程杂志（Transaction o AIJ）。

Yasuji SHINOHARA: "Shear Behavior of Concrete Maintaining Axial Displacement of Load Constant"Proceedings of the Japan concrete Institute. Vol. 20, No. 2. 565-570 (1998)

Yasuji Shininohara：“保持荷载轴向位移恒定的混凝土的剪切行为”日本混凝土学会会刊。