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RESEARCH ON DURABILITY OF FIBER REINFORCED CONCRETE BASED ON WIENER DEGRADATION PROCESS
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摘要: 为研究严寒地区纤维混凝土的耐久性及使用寿命，设计了随温度变化下纤维混凝土加速寿命试验，定期测定试件的质量损失、相对动弹性模量，并根据测定的数据对其耐久性进行评价分析；同时依据一元Wiener退化过程建模并进行加速寿命预测。结果表明：随冻融次数的增加，试件逐步损伤劣化，试件的相对质量和相对动弹性模量均能有效反映损伤过程，且以相对动弹性模量作为评价参数更能准确、真实地反映试件的损伤劣化情况；通过一元Wiener退化过程进行可靠度建模，以试件的相对动弹性模量作为退化指标，利用该模型计算后可得到试件的概率密度函数和可靠度函数，对其结果进行数据拟合，并确定出纤维混凝土试件在该试验条件下最长使用寿命可达到3 500 h左右。
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关键词:
- 纤维混凝土 /
- 加速寿命试验 /
- 耐久性 /
- Wiener退化过程 /
- 可靠度
Abstract: To study the durability and service life of fiber reinforced concrete in severe cold areas, an accelerated life test of fiber reinforced concrete under temperature changes was designed. The mass loss and relative dynamic modulus of the specimen were periodically measured, and its durability based on the measured data was evaluated and analyzed. At the same time, based on the univariate Wiener degradation process, modeling and accelerated life prediction were conducted. The results showed that as the number of freeze-thaw cycles increased, the specimen was gradually damaged and deteriorated, and the relative mass and relative dynamic elastic modulus of the specimen could effectively reflect the damage process, and the relative dynamic elastic modulus as the evaluation parameter could more accurately and truly reflect the damage and deterioration of the specimen. Reliability modeling was carried out through the univariate Wiener degradation process, and the relative dynamic elastic modulus of specimens was used as the degradation index. After calculation using this model, the probability density function and reliability function of the specimen could be obtained. Data fitting was performed on the results, and it was determined that the longest service life of the fiber reinfoned concrete specimen could reach about 3 500 h under the test conditions. -
[1] 宋贺月,丁一宁.钢纤维在混凝土基体中空间分布的研究方法评述[J].材料科学与工程学报,2015,33(5):768-775. [2] WANG H T, WANG L C. Experimental Study on Static and Dynamic Mechanical Properties of Steel Fiber Reinforced Lightweight Aggregate Concrete[J]. Construction and Building Materials, 2013(38):1146-1151. [3] LIU Q F,HU Z, LU X Y, et al. Prediction of Chloride Distribution for Offshore Concrete Based on Statistical Analysis[J]. Materials,2020,13(1):174.DOI: 10.3390/ma13010174. [4] 乔宏霞,王鹏辉,李元可,等.基于Wiener退化对镁水泥混凝土中钢筋的锈蚀预测[J].西南交通大学学报,2019,54(6):1252-1257. [5] 陈应波,卢哲安,黄达.层布式钢纤维混凝土疲劳寿命的概率分布拟合[J].武汉理工大学学报,2002(12):33-36,48. [6] 乔宏霞,朱彬荣,路承功.基于Copula函数的现场暴露混凝土寿命预测方法[J].建筑材料学报,2017,20(2):191-197. [7] 蒋金洋,孙伟,金祖权,等.疲劳载荷与碳化耦合作用下结构混凝土寿命预测[J].建筑材料学报,2010,13(3):304-309. [8] 巴恒静,张武满.混凝土寿命加速实验方法与预测[J].硅酸盐学报,2007(2):242-246. [9] 余红发,孙伟,鄢良慧,等.混凝土使用寿命预测方法的研究I:理论模型[J].硅酸盐学报,2002(6):686-690. [10] 陶琦,巴恒静.加速渗透试验预测混凝土寿命的研究[J].混凝土,2010(11):16-17,20. [11] 王甲春,阎培渝.海洋环境下钢筋混凝土中钢筋锈蚀的概率[J].吉林大学学报(工学版),2014,44(2):352-357. [12] LI J C, QIAO H X, ZHU F F. Reliability Analysis of Freeze-Thaw Damage of Fiber Concrete Based on Miner Theory[J]. Emerging Materials Research, 2019,8(3):508-515. [13] LI J C, QIAO H X, ZHU F F. Reliability Analysis of Fiber Concrete Freeze-Thaw Damage Based on Wei Bull Method[J]. Emerging Materials Research,2020,9(1):70-77. [14] 蔡忠义,陈云翔,张诤敏,等.非线性步进加速退化数据的可靠性评估方法[J].北京航空航天大学学报,2016,42(3):576-582. [15] 潘正强,周经伦,孙权.基于Wiener过程的步进应力加速退化建模[J].系统工程与电子技术,2011,33(4):963-968. [16] 尹慧琳,杨筱菡,陆恒.Wiener过程性能退化产品可靠性评估新Bayes方法[J].同济大学学报(自然科学版),2015,43(8):1234-1238. [17] 蔡忠义,陈云翔,车飞,等.基于Wiener过程的非线性加速退化可靠性评估方法[J].电光与控制,2016,23(2):87-90. [18] 中华人民共和国住房和城乡建设部. 混凝土配合比设计规程:JGJ 55-2011[S]. 北京:中国建筑工业出版社,2011. [19] 李政伟,黄金林,陆金驰,等.冻融条件下钢纤维混凝土力学性能试验研究[J].四川建筑科学研究,2019,45(6):74-77. [20] 彭宝华. 基于Wiener过程的可靠性建模方法研究[D]. 长沙:国防科学技术大学,2010. 期刊类型引用(3)
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