基于监测数据的混凝土箱梁温度与应变多尺度相关性分析
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U448.33

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武汉市城乡建设委员会科技计划项目(201831);桥梁结构健康与安全国家重点实验室开放课题(2017-04-GF).


Analysis of Correlation for Temperature and Strain of Concrete Box Girder Based on Monitoring Data
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Science and Technology Program of Wuhan Urban and Rural Construction Commission, No.201831;State Key Laboratory of Health and Safety of Bridge Structures, No.2017-04-GF.

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    摘要:

    不均匀的温度分布会使混凝土箱梁产生显著的应力和变形,进而危及结构安全。文章基于一座在役混凝土箱梁的温度与应变监测数据,分析了其温度分布特征及应变演化规律,研究结果表明:箱梁结构竖向以及沿顶板、腹板厚度方向均存在明显的不均匀温度分布;箱梁结构的温度和应变在年和日两个时间尺度上均表现出明显的周期性变化。此外,初步研究了温度与应变的相关性,发现二者的Spearman相关系数达0.91。在此基础上,利用小波变换将应变监测数据分离为不同频率组分,其中a6层和d6层分别与季节温度变化和日温度变化具有显著的关联性,从而进一步揭示了温度对应变的影响机理。研究成果对增强桥梁结构运营期间的安全性和耐久性具有指导意义。

    Abstract:

    The uneven temperature distribution will cause significant thermal stress and deformation of concrete box girder, which will further endanger the structural safety. Based on the monitoring data of temperature and stress of a concrete box girder bridge in service, the temperature distribution characteristics and stress evolution law of structure are amply analyzed in this paper. The results indicate that there are obvious uneven temperature distribution in the vertical direction of the box girder structure and along the thickness of the roof and web. Simultaneously, the temperature and strain of the box girder structure have obvious periodic changes on the annual and daily time scales. Subsequently, the correlation between temperature and strain is preliminarily investigated, it is found that the Spearman correlation coefficient reached 0.91. On basis of this, the monitoring strain data are separated into different frequency components by wavelet transform, in which layer a6 and layer d6 were significantly correlated with seasonal and daily temperature variations, respectively. Therefore, the effect mechanism of temperature on strain is further revealed. In general, the research results are of guiding significance to enhance the safety and durability of bridge structures during operation.

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黄峰,王莹,郝静,等. 基于监测数据的混凝土箱梁温度与应变多尺度相关性分析[J]. 科学技术与工程, 2021, 21(36): 15624-15630.
Huang Feng, Wang Ying, Hao Jing, et al. Analysis of Correlation for Temperature and Strain of Concrete Box Girder Based on Monitoring Data[J]. Science Technology and Engineering,2021,21(36):15624-15630.

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  • 收稿日期:2021-04-20
  • 最后修改日期:2021-09-29
  • 录用日期:2021-09-08
  • 在线发布日期: 2022-01-04
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