中文摘要：

针对高墩混凝土箱梁墩顶块水化热温度场分布状况,考虑风速的影响,建立了非稳定对流热传导模式,利用有限元程序对8种风况的混凝土箱梁水化热温度场进行分析,总结了非稳定对流模式下混凝土箱梁墩顶块水化热温度场的分布规律,利用MATLAB分布拟合温度峰值和温差峰值随风速变化的计算公式.研究结果表明：非稳定计算模式适合计算高墩混凝土箱梁墩顶块的水化热温度场;水化热温升效应明显、衰减缓慢、约48 h达到温度峰值;风速影响各个时间点的水化热温度数值,然对其变化趋势无影响,风速对温升影响小,对温度的衰减影响大;随着风速的增大,水化热温度衰减趋势逐渐降低,薄厚差异明显的结构温度衰减具有阶跃现象;当风速较大时,温度衰减变化幅度减小,有靠拢之趋势;风速对温差峰值的影响与风速对温度峰值的影响呈相反趋势;温差64 h左右达到峰值、其值约24℃;减小风速,有利于控制温差,旨在达到控制温度应力的目的.

英文摘要：

Being aimed to temperature fields distribution problem of concrete box girders on high piers,the wind speed was considered,the non-stable convection heat conduction model was built,finite element procedure was applied to analyze hydration heat temperature distribution for concrete box girders under condition of the eight kinds of winds speed,the distribution laws of hydration heat temperature distribution for concrete box girders under non-stable convection heat conduction was generalized.The procedure of MATLAB was applied to fit a formula for the peak value of temperature and temperature difference with variation of wind speed.The results indicated： non-stable convection heat conduction model is suitable for the calculation of hydration heat fields of concrete box girders on high piers;temperature rise effect of hydration heat is obvious,attenuation is gradual,temperature peak value is reached in the 48th hour,wind speed has an influence on hydration heat temperature value in each time,has little influence on its variation tendency,has a little influence on temperature rise,has little influence on temperature attenuation;with increment of wind speed,attenuation tendency becomes low,phase phenomenon occurs about temperature attenuation for structures with obvious thickness;while wind speed is violent,the attenuation argument becomes low,and they are close to each other;the influence of wind speed on temperature peak value and temperature difference peak value present reverse tendency;the temperature difference peak value can reach 24℃ near the 64th hour;the temperature can be controlled by decreasing wind speed,Therefone,the plurmal stresses are decreased.