高速铁路简支箱梁日照温差的变化规律
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摘要
考虑日照条件下混凝土箱梁热流密度边界的时变特征,建立高速铁路简支箱梁温度场参数化仿真分析模型,研究高速铁路标准跨径简支箱梁温差的分布特征及控制措施。结果表明:箱梁最大正、负温差均沿厚度方向呈负指数分布,最大正温差在数值上大于负温差;随着大气透明度系数的提高,箱梁顶板和底板的正、负温差及腹板的负温差增大,而腹板正温差随之减小;箱梁温差与混凝土短波辐射吸收率成正相关,涂刷浅色涂料和提高混凝土表面光洁度可有效减小箱梁温差;昼夜气温差对箱梁温差分布影响显著,日温差越大箱梁各个部位温差越大;增大梁顶覆盖层厚度可一定程度上降低箱梁顶板温差。
Considering the time-varying characteristics of heat f lux boundary of concrete box girder under solar radiation,a parametric simulation model of temperature f ield of simply-supported box girder on high speed railway was established to study the distribution characteristics and control measures of temperature difference of standard span simply-supported box girder on high speed railway.The results show that the maximum positive and negative temperature differences of box girder are negatively exponentially distributed along the thickness direction,and the maximum positive temperature difference is greater than the negative temperature difference in numerical value.With the increase of atmospheric transparency coeff icient,the positive and negative temperature differences of top and bottom decks of box girder and the negative temperature difference of web increase,while the positive temperature difference of web decreases.The temperature difference of box girder is positively correlated with the absorptivity of shortwave radiation.The temperature difference of box girder can be effectively reduced by applying light-colored paint and improving the surface f inish of concrete.The temperature difference between day and night has a signif icant effect on the temperature difference distribution of box girder.The larger the temperature difference between day and night,the greater the temperature difference of each part of box girder.The temperature difference of top deck of box girder can be reduced to a certain extent by increasing the thickness of overburden.
Considering the time-varying characteristics of heat f lux boundary of concrete box girder under solar radiation,a parametric simulation model of temperature f ield of simply-supported box girder on high speed railway was established to study the distribution characteristics and control measures of temperature difference of standard span simply-supported box girder on high speed railway.The results show that the maximum positive and negative temperature differences of box girder are negatively exponentially distributed along the thickness direction,and the maximum positive temperature difference is greater than the negative temperature difference in numerical value.With the increase of atmospheric transparency coeff icient,the positive and negative temperature differences of top and bottom decks of box girder and the negative temperature difference of web increase,while the positive temperature difference of web decreases.The temperature difference of box girder is positively correlated with the absorptivity of shortwave radiation.The temperature difference of box girder can be effectively reduced by applying light-colored paint and improving the surface f inish of concrete.The temperature difference between day and night has a signif icant effect on the temperature difference distribution of box girder.The larger the temperature difference between day and night,the greater the temperature difference of each part of box girder.The temperature difference of top deck of box girder can be reduced to a certain extent by increasing the thickness of overburden.
引文
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[12]肖祥南.64米简支槽形箱梁的温度场及效应研究[D].长沙:中南大学,2010.
[2]KEHLBECK F.太阳辐射对桥梁结构的影响[M].刘兴法,译.北京:中国铁道出版社,1981.
[3]刘兴法.预应力混凝土箱形梁的日照温度应力与位移计算[J].桥梁建设,1980,10(1):32-38.
[4]铁道部第四勘测设计院科研所.空心高桥墩温度应力实验研究总结报告[R].武汉:铁道部第四勘测设计院科研所,1981.
[5]彭友松,朱晓文,强士中.混凝土箱梁温度应力三维分析[J].铁道学报,2009,31(3):116-121.
[6]曾庆响,韩大建,马海涛,等.预应力混凝土箱梁桥的温度效应分析[J].中南大学学报(自然科学版),2010,41(6):2360-2366.
[7]顾斌,陈志坚,陈欣迪.大跨径混凝土箱梁桥有效温度与应变的实测分析[J].吉林大学学报(工学版),2013,43(4):877-884.
[8]LI D N,MAES M A,DILGER W H.Thermal Design Criteria for Deep Prestressed Concrete Girders Based on Data from Confederation Bridge[J]. Canadian Journal of Civil Engineering,2004(5):813-825.
[9]戴公连,苏海霆,闫斌.圆曲线段无砟轨道横竖向温度梯度研究[J].铁道工程学报,2014,31(9):40-45.
[10]张建荣,周元强,林建平,等.太阳辐射对混凝土箱梁温度效应的影响[J].同济大学学报(自然科学版),2008,36(11):1479-1484.
[11]陶翀,谢旭,申永刚,等.基于概率分析的混凝土箱梁温度梯度模式[J].浙江大学学报(工学版),2014,48(8):1353-1361.
[12]肖祥南.64米简支槽形箱梁的温度场及效应研究[D].长沙:中南大学,2010.