| 摘要: |
| 研究了钢纤维掺量(体积分数)为0%，1%，2%，3%的钢纤维混凝土试块在应力比为1.00∶0，100∶0.25，1.00∶0.50，1.00∶0.75，1.00∶1.00，以及应变速率为10-5，10-4，10-3，10-2s-1下的双轴动态抗压性能，分析了以上3种因素对混凝土极限抗压强度、应力应变曲线等力学指标的影响规律.结果表明：各种钢纤维掺量和应力比条件下，混凝土的极限抗压强度均随着应变速率的提高而增大；在相同应变速率和钢纤维掺量条件下，应力比为1.00∶0.50时，混凝土极限抗压强度最大.另外，钢纤维混凝土的韧性较普通混凝土有很大提高. |
| 关键词: 钢纤维混凝土 应变速率 钢纤维掺量 双轴抗压 动态力学性能 韧性 |
| DOI：10.3969/j.issn.1007 9629.2017.01.019 |
| 分类号: |
| 基金项目:国家自然科学基金面上项目（51378090）；国家重点基础研究发展计划（973计划）项目（2015CB057703） |
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| Experimental Study on Dynamic Mechanical Behavior of Steel Fiber Reinforced Concrete under Biaxial Compression |
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WANG Licheng, JIANG Peiqing, LIANG Yongqin
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State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
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| Abstract: |
| Dynamic biaxial compressive tests under different stress ratios(1.00∶0，1.00∶0.25，1.00∶050，1.00∶0.75，1.00∶1.00)and different strain rates(10-5，10-4，10-3，10-2 s-1)on steel fiber reinforced concrete specimens with 0%, 1%, 2%, 3% steel fiber contents(by volume) were conducted. The influences of stress ratio, strain rate and content of steel fibers on the mechanical properties of concrete such as ultimate compressive strength and stress strain curve were investigated. The results show that the compressive strength of concrete under various conditions increases with the increase of strain rate. The ultimate compressive strength of various steel fiber reinforced concretes reaches the maximum value at stress ratio of 100∶0.50. In addition, steel fiber reinforced concrete exhibits much better toughness when compared with the normal plain concrete. |
| Key words: steel fiber reinforced concrete strain rate steel fiber content biaxial compression dynamic mechanical behavior toughness |
