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《Journal of Central South University(Science and Technology)》 2013-11
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Daily temperature difference of concrete double T beam in permafrost regions along Qinghai—Tibet railway

ZHANG Xiangmin;GAO Liang;ZENG Zhiping;GAO Baolin;ZHANG Guangyi;School of Civil Engineering, Beijing Jiaotong University;School of Civil Engineering, Central South University;Qinghai-Tibet Railway Company;  
A set of on-the-spot test and theoretical analysis in daily temperature difference of concrete double T beam in permafrost regions of Qinghai—Tibet railway were carried out. An automatic collection and storage system for air and beam temperature was developed which was suitable for the bad weather conditions of Qinghai—Tibet Plateau. The surface temperature of concrete double T beam was continuously tested for 1 a in the typical regions of Qinghai—Tibet railway, such as Tuotuohe, Zhajizangbu, and so on. A two-dimensional unsteady simulation model of double T beam solar radiation temperature field was established by using the finite element method. The beam section temperature distribution of the corresponding testing moment was analyzed with the measured data, based on which the daily temperature differences were obtained. The results show that the maximum daily temperature differences of beam are 10.2 ℃ and17.8 ℃ respectively in Tuotuohe and Zhajiazangbu. In Zhajiazangbu, there are 20 d of daily temperature differences greater than the standard value(15 ℃), which accounts for 5.31% of the total number of samples, and it mainly appears from November to March of next year. The research results are significant for the design and maintenance of continuously welded rail track on bridge in permafrost regions of Qinghai—Tibet railway.
【Fund】: 铁道部科技研究开发计划重点项目(QZ2010-G01 2010G026);; 国家自然科学基金资助项目(50908236);; 高等学校博士学科点专项科研基金资助课题(20090162120038);; 湖南省自然科学基金资助项目(09JJ4022);; 中南大学研究生自主探索创新基金(2011SSXT156)
【CateGory Index】: U448.212;U441
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