结合均匀化理论对钢纤维混凝土梁的疲劳性能分析

摘要/Abstract

摘要： 钢纤维混凝土(SFRC)在工程中应用日益广泛,为了探究其疲劳破坏现象内在机理,本文结合Mori-Tanaka均匀化理论预测了不同体积掺量下钢纤维混凝土的弹性模量,并以此为基础建立钢纤维混凝土梁四点弯曲有限元模型,采用Miner疲劳损伤准则,分别进行了静力抗弯试验和疲劳试验的数值模拟。模拟结果与相关试验结果拟合较好,验证了模型的可靠性。利用疲劳分析软件,预测了钢纤维混凝土梁的疲劳寿命和疲劳强度,分析了纤维掺量、尺寸效应和纤维长度对疲劳寿命的影响。结果表明:钢纤维可以大幅提高混凝土梁的疲劳寿命,应力水平越低、纤维掺量越大,增幅越大;尺寸效应对疲劳强度和疲劳寿命有一定影响,但随着构件尺寸增加对疲劳性能影响减小;纤维长度越长,梁的抗疲劳性能越好。

关键词: 钢纤维混凝土, 均匀化理论, 纤维长度, 纤维掺量, 尺寸效应, 疲劳寿命, 疲劳强度

Abstract: Steel fiber reinforced concrete (SFRC) is widely used in engineering. To explore the internal mechanism of fatigue failure phenomenon of SFRC, Mori-Tanaka homogenization theory was used to predict the elastic modulus of SFRC with different steel fiber volume content. Based on the calculated results, a four-point bending finite element model of SFRC beam was established. Miner fatigue damage criterion was used to carry out bending static test and fatigue test of numerical simulation of the experiment. The simulation results are in good agreement with the relevant test results, which verifies the reliability of the model. The fatigue life and fatigue strength of SFRC beams were predicted by using fatigue analysis software. The influences of fiber content, size effect and fiber length on the fatigue life were analyzed. The results show that steel fiber greatly improves the fatigue life of concrete beams, and the lower the stress level and the greater the fiber content are, the higher the improvement range is. The size effect has a certain influence on the fatigue strength and fatigue life, but the influence on the fatigue performance decreases with the increase of component size. The longer the fiber length is, the better the fatigue performance of the SFRC beam is.

Key words: steel fiber reinforced concrete, homogenization theory, fiber length, fiber content, size effect, fatigue life, fatigue strength

中图分类号:

TU528

贺正波, 王辉明. 结合均匀化理论对钢纤维混凝土梁的疲劳性能分析[J]. 硅酸盐通报, 2021, 40(8): 2574-2583.

HE Zhengbo, WANG Huiming. Fatigue Performance Analysis of Steel Fiber Reinforced Concrete Beams Combined with Homogenization Theory[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2574-2583.

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