| 叶中豹,潘锐.准静态循环加卸载下钢纤维混凝土力学特性分析[J].安徽建筑大学学报,2022,30(4):14-19 |
| 准静态循环加卸载下钢纤维混凝土力学特性分析 |
| Analysis of Mechanical Properties of Steel Fiber Reinforced Concrete Under Quasistatic Cyclic Loading and Unloading |
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| DOI： |
| 中文关键词: 钢纤维混凝土 循环加卸载 围压 饱水性能 能量 |
| 英文关键词: steel fiber concrete triaxial cyclic loading and unloading confining pressure saturated water performance energy |
| 基金项目:安徽省高校自然科学重点项目（KJ2019A0745）；校级博士启动基金项目（2019QDZ05，2019QDZ03）；建筑结构与地下工程 重点实验室开放基金项目（KLBSUE-2021-04） |
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| 中文摘要: |
| 为探究饱水处理、围压改变对准静态荷载作用下钢纤维混凝土材料强度以及能量演化特征的影响规律，采用MTS816岩石力学试验系统开展同应变率、同围压、饱水和未饱水；同应变率、不同围压、未饱水等条件三轴循环加卸载等相关试验。由试验结果可知：钢纤维混凝土材料经过饱水处理，峰值应力对应的峰值应变稍大，且表现出明显的体积压缩现象，但材料强度降低；在三轴循环加卸载作用下材料应力-应变曲线出现滞回环效应；滞回环最大面积通常出现在材料的峰值应力附近，随着围压增加，面积最大的滞回环对应的应力点随之推迟出现；随着围压提高，材料峰值应力后的应力-应变曲线变得平缓，表现出更明显的塑性变形特征，且材料的峰值应力提高明显。 |
| 英文摘要: |
| In order to explore the influence of saturation and confining pressure on the strength and energy evolution characteristics of steel fiber reinforced concrete （SFRC） under quasi-static loading，the MTS model 816 rock mechanics test system was used to carry out triaxial cyclic loading and unloading tests with the same strain rate，different confining pressures and saturated and unsaturated water. The test results show that the peak strain of the SFRC corresponds to a slightly larger peak strain and exhibits obvious volume compression after saturation treatment，but the material strength decreases. Under triaxial cyclic loading and unloading，the hysteresis loop effect appears in the stress-strain curve. The maximum area of the hysteresis loop usually appears near the peak stress of the material. As the confining pressure increases，the stress point corresponding to the maximum area of hysteresis loop is delayed，and the stress-strain curve after the peak stress becomes gentle，showing more obvious plastic deformation characteristics，and the peak stress of the material increases significantly. |
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