| 摘要: |
| 通过三点弯曲试验，分析比较了单向分布与乱向分布钢纤维混凝土的极限荷载、断裂韧度、断裂能和裂缝尖端开口位移.结果表明：与乱向分布钢纤维混凝土相比，单向分布钢纤维混凝土极限荷载、断裂韧度、断裂能和裂缝尖端开口位移均有明显提高.单向分布钢纤维混凝土断裂性能明显优于乱向分布钢纤维混凝土.单向分布钢纤维混凝土中有更多的钢纤维桥接裂缝两边并有效承受荷载，使其断裂性能明显提高. |
| 关键词: 单向分布钢纤维混凝土 纤维方向系数 断裂性能 韧性 |
| DOI：103969/j.issn1007 9629201601013 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51578208,51309073）；河北省高等学校科学技术研究项目（ZD2015028） |
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| Aligned Steel Fiber Reinforced Cement Based Composites（Ⅲ）：Fracture Properties |
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MU Ru1, WANG Cheng1, LI Hui1, LIN Jianjun1, ZHAO Quanming2
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1.School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China;2.School of Information Engineering, Hebei University of Technology, Tianjin 300401, China
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| Abstract: |
| Through three point bending tests, the ultimate load, fracture toughness, fracture energy and crack tip opening displacement（CTOD）of aligned steel fiber reinforced concrete（ASFRC） were determined and compared with those of randomly distributed steel fiber reinforced concrete（SFRC）. The results show that, compared with SFRC, the ultimate load, fracture toughness, fracture energy and CTOD of ASFRC are improved significantly. The ASFRC exhibits obvious advantages in fracture properties relative to SFRC. In ASFRC, the number of fibers bridging the two sides of cracks and the effective reinforcement of the matrix are much more than that in SFRC, which leads to the improvement in fracture property of ASFRC. |
| Key words: aligned steel fiber reinforced concrete fiber orientation coefficient fracture property toughness |
