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| 尺寸效应对混凝土受压力学性能影响试验研究 |
| Experimental Study of Size Effect on Compressive Mechanical Properties of Concrete |
| 投稿时间：2019-01-31 |
| DOI：10.16018/j.cnki.cn32-1650/n.201902015 |
| 中文关键词: 混凝土 单轴受压 强度特征值 尺寸效应律 |
| 英文关键词: Concrete Uniaxial compression Strength characteristic value size effect law |
| 基金项目:2017年安徽省高校自然科学研究重点项目(KJ2017A675)；2015—2018安徽省高职教育创新发展项目(270)；2018—2020年度中国交通教育研究会教育科学研究课题(交教研1802-308) |
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| 中文摘要: |
| 设置3种立方体尺寸与强度等级普通混凝土，应用液压伺服机对混凝土进行单轴受压，通过试验得到不同加载工况混凝土破坏形态和抗压强度特征值，并进行相应对比分析和机理探讨，从尺寸效应度和尺寸效应律两个方向对混凝土抗压强度尺寸效应进行定量分析，并提出尺寸效应律统一方程，得到以下结论:不同强度等级混凝土受尺寸效应影响破坏形态变化规律基本相同，尺寸较大试件破坏后的完整性相对较好，破坏裂缝表现得相对不明显；相同强度等级混凝土，立方体边长尺寸的提高使得混凝土单轴受压强度特征值随之降低；不同强度等级混凝土，混凝土受尺寸效应抗压强度降低幅值逐步提高，其降低百分率变化基本平稳。 |
| 英文摘要: |
| Three cube sizes and strength grades of ordinary concrete are set up. The concrete is subjected to uniaxial compression by hydraulic servo machine. The characteristic values of failure modes and compressive strength of concrete under different loading conditions are obtained through experiments, and the corresponding comparative analysis and mechanism discussion are carried out. The size effect of concrete compressive strength is quantitatively analyzed from the two directions of size effect degree and size effect law, and the unified equation of size effect law is put forward. The following conclusions are drawn that the regularity of failure modes of concrete with different strength grades affected by size effect is basically the same. The integrity of the larger specimens is relatively good after failure, and the performance of the cracks is relatively insignificant. For concrete of the same strength grade, the characteristic value of uniaxial compressive strength of concrete decreases with the increase of cube side length size. For concrete of different strength grades, the reduction amplitude of compressive strength of concrete affected by size effect increases gradually, and the change of reduction percentage is basically stable. |
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