| 持续荷载与冻融循环耦合作用下纤维混凝土损伤性能研究 |
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| 引用本文： | 孙杰,冯川,吴爽,马稳,孙明星.持续荷载与冻融循环耦合作用下纤维混凝土损伤性能研究[J].硅酸盐通报,2022,41(8):2728-2738. |
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| 作者姓名： | 孙杰 冯川 吴爽 马稳 孙明星 |
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| 作者单位： | 武汉科技大学城市建设学院,武汉 430065 |
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| 基金项目： | 湖北省建设科技计划项目(202144);湖北省教育厅科学研究计划青年人才项目(Q20201101) |
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| 摘 要： | 为了研究纤维混凝土在持续荷载与冻融循环耦合作用下的损伤性能,开展了不同压应力水平(0、0.3、0.5)作用下的纤维混凝土冻融循环试验,研究了不同应力水平作用下试件质量损失、相对动弹性模量和抗压强度损失等参数随冻融循环次数的变化规律。结合损伤力学,以超声波波速为损伤变量,分析了冻融损伤与荷载耦合作用的变化关系,并基于Weibull分布建立了冻融损伤预测模型,推导出冻融损伤与抗压强度的演化方程。结果表明,随着冻融循环次数的增加,冻融损伤程度表现出加剧上升的现象,应力水平为0.3的耦合作用能减小纤维混凝土的冻融损伤,应力水平为0.5的耦合作用会进一步加剧纤维混凝土的冻融损伤。建立的损伤预测模型具备较高的可行性,能够较精准预测不同冻融循环次数后的损伤,推导的演化方程相关性较好,能灵活实现损伤与强度之间的转化。
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| 关 键 词： | 纤维混凝土 冻融循环 耦合作用 损伤性能 持续荷载 预测模型 |
| 收稿时间： | 2022-04-26 |
Damage Properties of Fiber Concrete under Coupling Effect of Continuous Loading and Freeze-Thaw Cycles |
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| SUN Jie,FENG Chuan,WU Shuang,MA Wen,SUN Mingxing.Damage Properties of Fiber Concrete under Coupling Effect of Continuous Loading and Freeze-Thaw Cycles[J].Bulletin of the Chinese Ceramic Society,2022,41(8):2728-2738. |
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| Authors: | SUN Jie FENG Chuan WU Shuang MA Wen SUN Mingxing |
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| Affiliation: | School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China |
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| Abstract: | In order to study the damage performance offiber concrete under the coupling effect of continuous loading and freeze-thaw cycles, the freeze-thaw cycle experiment of fiber concrete was performed under the effect of different compressive stress levels (0, 0.3, 0.5), some parameters, such as test mass loss, relative dynamic elastic modulus and compressive strength loss and so on, were studied with the number of freeze-thaw cycles.Combined with damage mechanics, taking ultrasonic wave velocity as damage variable, the relationship between freeze-thaw damage and load coupling action were analyzed. The freeze-thaw damage prediction model was established according to the Weibull and the evolution equation of freeze-thaw damage and compressive strength was obtained. The results show that, with the increase of the number of freeze-thaw cycles, the freeze-thaw damage of fiber concrete is reduced under the coupling of stress level of 0.3, and the freeze-thaw damage of fiber concrete is further aggravated under stress level of 0.5. The damage prediction model has high feasibility and it accurately predicts the different damage after freeze-thaw cycles. The evolution equation derived has better correlation, and it flexibly realizes the transformation between freeze-thaw damage and compressive strength. |
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| Keywords: | fiber concrete freeze-thaw cycle coupling effect damage property continuous loading prediction model |
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