Estimating extreme temperature differences in steel box girder using long-term measurement data
Estimating extreme temperature differences in steel box girder using long-term measurement data
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DOI：
10.1007/s11771-013-1766-6
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发表时间：
2013-09
影响因子：
4.4
通讯作者：
You-liang Ding;Gaoxin Wang
中科院分区：
文献类型：
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作者：
You-liang Ding;Gaoxin Wang
对某斜拉桥扁平钢箱梁的极端温差进行了研究。首先，利用润扬大桥斜拉桥结构健康监测系统采集的长期实测数据，总结了箱梁截面实测温差的日变化规律和季节变化规律。进一步建立了温差的概率分布模型，估算了重现期为100年的极端温差。最后，提出了桥梁截面温差模型，为桥梁热设计提供了依据。结果表明，顶板水平温差和上下板垂直温差较大。所有的正负温差都可以用两个威布尔分布的加权和来描述。顶板最大正负水平温差分别为10.30 °C和−13.80 °C。顶板和底板之间的最大正温差和负温差分别为17.30 °C和−3.70 °C。桥梁热工设计中，顶板与底板的竖向温差模型有2个，顶板的横向温差模型有6个。
The extreme temperature differences in flat steel box girder of a cable-stayed bridge were studied. Firstly, by using the long-term measurement data collected by the structural health monitoring system installed on the Runyang Cable-stayed Bridge, the daily variations as well as seasonal ones of measured temperature differences in the box girder cross-section area were summarized. The probability distribution models of temperature differences were further established and the extreme temperature differences were estimated with a return period of 100 years. Finally, the temperature difference models in cross-section area were proposed for bridge thermal design. The results show that horizontal temperature differences in top plate and vertical temperature differences between top plate and bottom plate are considerable. All the positive and negative temperature differences can be described by the weighted sum of two Weibull distributions. The maximum positive and negative horizontal temperature differences in top plate are 10.30 °C and −13.80 °C, respectively. And the maximum positive and negative vertical temperature differences between top plate and bottom plate are 17.30 °C and −3.70 °C, respectively. For bridge thermal design, there are two vertical temperature difference models between top plate and bottom plate, and six horizontal temperature difference models in top plate.