泊松比变化对基于波速混凝土损伤计算的影响

doi:10.3969/j.issn.1000-1158.2024.06.14

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摘要利用超声波波速计算材料损伤的方法有广泛的应用,然而现有研究中常忽略泊松比的变化。研究了泊松比变化对基于波速混凝土损伤计算结果的影响。首先,通过理论分析,在基于波速的损伤计算公式中引入泊松比修正系数;其次,通过对混凝土柱试件进行轴压试验,验证了考虑泊松比变化的必要性;最后,在试验数据的基础上提出了泊松比修正系数实用计算方法。结果表明:忽略泊松比变化的影响时,基于波速的混凝土损伤计算值与真实值的平均相对误差高达73％;采用泊松比修正系数后,该误差减小至21％。基于波速进行混凝土损伤计算时宜计入泊松比修正系数以提高计算精度。

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	徐佳慧
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关键词 ：超声检测;材料损伤;超声波波速, 泊松比;修正系数;混凝土

Abstract：The method of calculating material damage using ultrasonic wave velocities are widely used, however the variation in Poissons ratio was often ignored in past researches. The effect of Poissons ratio variations on damage calculation of concrete based on ultrasonic wave velocities was investigated. Firstly, the Poissons ratio correction factor was introduced into the wave velocity-based damage calculation equation through theoretical analysis. Secondly, the necessity of considering Poissons ratio variations was verified by conducting axial compression tests on concrete column specimens. Finally, a Poissons ratio correction factor calculation method was proposed on the basis of the experimental data. The results show that the average relative error between the calculated value based on wave velocity and true value of concrete damage is up to 73% when the effect of Poisson’s ratio variation is ignored, and the error is reduced to 21% by applying the Poissons ratio correction factor. These findings suggest that it is advisable to include the Poissons ratio correction factor to improve the accuracy of the calculation when calculating concrete damage based on wave velocity.

Key words： ultrasonic testing material damage ultrasonic wave velocity Poisson’s ratio correction factor concrete

收稿日期: 2023-06-25 发布日期: 2024-06-06

PACS:

TB95

基金资助:国家自然科学基金(52178365)

通讯作者: 杨予(1975-),广西武鸣人,浙江理工大学副教授,从事结构动力学与超声检测方向的研究工作。Email:yangyu@zstu.edu.cn E-mail: yangyu@zstu.edu.cn

作者简介: 徐佳慧(1999-),浙江金华人,浙江理工大学建筑工程学院研究生,研究方向为超声诊断方向。Email:xujiahui924@foxmail.com

引用本文:

徐佳慧,杨予,刘恒,周强兵. 泊松比变化对基于波速混凝土损伤计算的影响[J]. 计量学报, 2024, 45(6): 881-889.
XU Jiahui,YANG Yu,LIU Heng,ZHOU Qiangbing. Effects of the Variation of Poissons Ratio on the Calculation of Concrete Damage Based on Wave Velocity. Acta Metrologica Sinica, 2024, 45(6): 881-889.

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