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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. -
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