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Smart Structures and Systems
  Volume 25, Number 5, May 2020, pages 593-604

Temperature distribution analysis of steel box-girder based on long-term monitoring data
Hao Wang, Qingxin Zhu, Zhongqin Zou, Chenxi Xing, Dongming Feng and Tianyou Tao

    Temperature may have more significant influences on structural responses than operational loads or structural damage. Therefore, a comprehensive understanding of temperature distributions has great significance for proper design and maintenance of bridges. In this study, the temperature distribution of the steel box girder is systematically investigated based on the structural health monitoring system (SHMS) of the Sutong Cable-stayed Bridge. Specifically, the characteristics of the temperature and temperature difference between different measurement points are studied based on field temperature measurements. Accordingly, the probability density distributions of the temperature and temperature difference are calculated statistically, which are further described by the general formulas. The results indicate that: (1) the temperature and temperature difference exhibit distinct seasonal characteristics and strong periodicity, and the temperature and temperature difference among different measurement points are strongly correlated, respectively; (2) the probability density of the temperature difference distribution presents strong non-Gaussian characteristics; (3) the probability density function of temperature can be described by the weighted sum of four Normal distributions. Meanwhile, the temperature difference can be described by the weighted sum of Weibull distribution and Normal distribution.
Key Words
    temperature distribution; steel-box girder; filed monitoring data; cable-stayed bridge; temperature difference; probability density
(1) Hao Wang, Qingxin Zhu, Zhongqin Zou, Tianyou Tao:
Key Laboratory of C&PC Structures of Ministry of Education, Southeast University, Nanjing, China;
(2) Chenxi Xing:
School of Law, Southeast University, Nanjing, China;
(3) Dongming Feng:
Weidlinger Transportation Practice, Thornton Tomasetti, New York, USA.

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