Chen Shunchao, Wu Wenxiang, Yun Jianzhou, Mao Shihua, Yu Yue
School of Civil Engineering, Southwest Forestry University, Kunming, 650224, Yunnan, China.
Sci Rep. 2024 Aug 13;14(1):18803. doi: 10.1038/s41598-024-69545-7.
In order to accurately and easily predict the variation of the average temperature of the concrete rectangular hollow pier. Firstly, the temperature distribution of the concrete rectangular hollow pier of Changjiahe Special Bridge was observed for 212 days. Then, based on the observation data, the functional relationship between the average concrete hollow pier temperature and the outside air temperature, and the air temperature inside the hollow pier was studied. Finally, based on this functional relationship, a prediction model for the range of variation of the mean temperature of the hollow pier was given and verified. The results of the study show that: the change of external shade temperature can be regarded as the superposition of different cyclic changes and random changes; the change rule of the average temperature of the concrete hollow pier is the same as that of the air temperature, both presenting day-by-day cyclic and step changes; the linear correlation coefficients between the daily maximum and daily minimum average hollow pier temperature and the daily average air temperature are R = 0.980 and R = 0.973, respectively; the daily average air temperature, the daily average air temperature inside the pier and daily average hollow pier temperature are R = 0.980, R = 0.998; the daily variation of the average hollow pier temperature and the daily variation of the air temperature are approximately linear, with a correlation coefficient of R = 0.899; assuming that the average temperature of the concrete hollow pier is a folding change, based on the above relationship, a method of predicting the time-by-time average temperature of the concrete hollow piers is proposed, as well as two methods of predicting the average temperature of the test piers. Average temperature change range method. Comparing the predicted values with the measured values, it is found that the predicted values are in good agreement with the measured values.
为了准确、便捷地预测混凝土矩形空心桥墩平均温度的变化情况。首先，对长家河特大桥混凝土矩形空心桥墩的温度分布进行了212天的观测。然后，基于观测数据，研究了混凝土空心桥墩平均温度与外界气温、空心桥墩内部气温之间的函数关系。最后，基于此函数关系，给出并验证了空心桥墩平均温度变化范围的预测模型。研究结果表明：外界遮荫温度的变化可视为不同周期变化与随机变化的叠加；混凝土空心桥墩平均温度的变化规律与气温相同，均呈现逐日循环和阶跃变化；空心桥墩日最高平均温度和日最低平均温度与日平均气温的线性相关系数分别为R = 0.980和R = 0.973；日平均气温、桥墩内部日平均气温与空心桥墩日平均温度的相关系数分别为R = 0.980、R = 0.998；空心桥墩平均温度的日变化与气温的日变化近似呈线性关系，相关系数为R = 0.899；假设混凝土空心桥墩平均温度为折线变化，基于上述关系，提出了一种预测混凝土空心桥墩逐时平均温度的方法，以及两种预测试验桥墩平均温度的方法。平均温度变化范围法。将预测值与实测值进行比较，发现预测值与实测值吻合良好。
