高速铁路大跨度斜拉桥钢箱梁温度模式分析
Temperature mode of steel box girder of long span cable-stayed bridge of high-speed railway
- 铁道科学与工程学报 2023年20卷第11期 页码：4031-4040
- 作者机构：
1.中南大学 土木工程学院，湖南 长沙 410075
2.高速铁路建造技术国家工程研究中心，湖南 长沙 410075
- 作者简介：
刘文硕(1985—)，女，河南商丘人，副教授，博士，从事高速铁路大跨度桥梁研究；E-mail：liuwenshuo@csu.edu.cn
- 基金信息：国家自然科学基金资助项目(52278234);湖南省自然科学基金资助项目(2022JJ30728)
DOI：10.19713/j.cnki.43-1423/u.T20222305
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刘文硕,吕方舟,戴公连等.高速铁路大跨度斜拉桥钢箱梁温度模式分析[J].铁道科学与工程学报,2023,20(11):4031-4040.
LIU Wenshuo,LÜ Fangzhou,DAI Gonglian,et al.Temperature mode of steel box girder of long span cable-stayed bridge of high-speed railway[J].Journal of Railway Science and Engineering,2023,20(11):4031-4040.
刘文硕,吕方舟,戴公连等.高速铁路大跨度斜拉桥钢箱梁温度模式分析[J].铁道科学与工程学报,2023,20(11):4031-4040. DOI： 10.19713/j.cnki.43-1423/u.T20222305.
LIU Wenshuo,LÜ Fangzhou,DAI Gonglian,et al.Temperature mode of steel box girder of long span cable-stayed bridge of high-speed railway[J].Journal of Railway Science and Engineering,2023,20(11):4031-4040. DOI： 10.19713/j.cnki.43-1423/u.T20222305.
摘要
为探究高速铁路大跨度斜拉桥钢箱梁温度场的时间和空间分布规律，基于商合杭高铁裕溪河大桥长期现场实测温度数据，通过时间序列分析、傅立叶曲线拟合等方法，针对高速铁路斜拉桥钢箱梁的温度荷载模式开展研究。通过时间序列加法模型，将钢箱梁的温度时程分解为长期趋势、年温度作用、不规则变动和日照作用，并拆分钢箱梁温度为日均匀温度和波动温度，分别得到二者的时程曲线。此外，通过傅立叶曲线拟合获得钢箱梁的日均匀温度和四季波动温度拟合公式，探究钢箱梁日均匀温度和波动温度的变化规律，并通过正负温差分析，用指数函数拟合得到钢箱梁四季的梯度温度作用模式。研究结果表明，钢箱梁日均匀温度和波动温度均可以用傅立叶曲线进行较高精度的拟合；四季中钢箱梁波动温度幅值最大的为夏季，其次为春季和秋季，冬季的波动温度幅值最小；钢箱梁合拢温度应接近结构日均匀温度区间的中位值，钢箱梁在春秋季合拢最为理想，在夏冬季的最佳合拢时间分别为凌晨5点和下午17点；钢箱梁竖向最大温差出现在夏季；四季正温差均在14点左右达到最大值，夜晚负温差基本保持恒定；构建的钢箱梁正负温差模式相比各国规范能更好地包络实测温度数据。研究结果可为高速铁路大跨度斜拉桥钢箱梁的温度时变研究和钢箱梁温度分布模式提供参考。
Abstract
To explore the temporal and spatial distribution of temperature field of steel box girder in high-speed railway (HSR) long-span cable-stayed bridges, the long-term in-situ measured temperature data of Yuxihe Bridge on Shangqiu-Hefei-Hangzhou HSR was used to study the temperature load model of HSR steel box girder cable-stayed bridge using time series analysis, Fourier curve fitting and other methods. Through the time series addition model, the temperature time history of steel box girder was decomposed into long-term trend, annual temperature effect, irregular variation and sunshine effect. The temperature of steel box girder was divided into two temperature forms: daily uniform temperature and fluctuating temperature. The time history curves of the two were obtained respectively. In addition, the fitting formula of daily uniform temperature and four-season fluctuation temperature of steel box girder was obtained by Fourier curve fitting. The variation rule of daily uniform temperature and fluctuation temperature was explored. The gradient temperature action mode of steel box girder in four seasons was obtained by using exponential function fitting through the analysis of positive and negative temperature difference. The results show that the daily uniform temperature and fluctuating temperature of steel box girder can be fitted with the Fourier curve with high precision. Among the four seasons, the maximum temperature fluctuation amplitude of steel box girder occurs in summer, followed by spring and autumn, and the minimum temperature fluctuation amplitude occurs in winter. The closing temperature of steel box girder should be close to the median value of the daily uniform temperature range of the structure. The closing time of steel box girder is the most appropriate in spring and autumn, and the best closing time in summer and winter is 5:00 pm and 17:00 pm respectively. The maximum vertical temperature difference of steel box girder occurs in summer. The positive temperature difference reaches the maximum at about 14:00 pm in all seasons, and the negative temperature difference at night is basically constant. Compared with national specifications in various countries, the measured temperature data of steel box girder can be better enveloped by the positive and negative temperature difference patterns constructed. The research results could provide a valuable reference for the temperature time-varying study and steel box girder temperature distribution mode of high-speed railway long-span cable-stayed bridges.
关键词
高速铁路钢箱梁温度模式时间序列
Keywords
high-speed railwaysteel box girdertemperature modetime series
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