| 叶中豹,李冰清,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(): |
| 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 concrete under quasi-static cyclic loading and unloading |
| 投稿时间：2021-09-06 修订日期：2021-10-18 |
| DOI： |
| 中文关键词: 钢纤维混凝土 三轴循环加卸载 能量 围压 饱水性能 |
| 英文关键词: Steel fiber concrete STri-axial cyclic loading and unloading SEnergy SConfining pressure SFull water performance |
| 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 (2019QDZ05,2019QDZ03) |
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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试验,并获得了各组试验条件下材料的应力-应变曲线。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,且表现出明显地体积压缩现象,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,表现出更明显地塑性变形特征,且材料的峰值应力提高明显。 |
| 英文摘要: |
| In order to explore the influence of saturated treatment and confining pressure change on the strength and energy evolution characteristics of steel fiber reinforced concrete (SFRC) under quasi-static load, MTS816 rock mechanics test system was used to carry out the same strain rate, same confining pressure, saturated and under-saturated rock.SA series of tri-axial cyclic loading and unloading tests under the same strain rate, different confining pressure and not saturated water were carried out, and the stress-strain curves of the materials under each test condition were obtained. The test results show that the peak strain corresponding to peak stress of SFRC material is slightly larger after water saturation treatment, and it shows obvious volume compression phenomenon, but the material strength decreases.SUnder tri-axial cyclic loading and unloading, the stress - strain curve of the material appears hysteretic effect.SThe maximum area of hysteresis loop usually occurs near the peak stress of the material. With the increase of confining pressure, the stress point corresponding to the maximum area of hysteresis loop is delayed.SWith the increase of confining pressure, the stress-strain curve of the material after peak stress becomes gentle, showing more obvious plastic deformation characteristics, and the peak stress of the material increases obviously. |
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