预冷流模式下混凝土箱梁水化热场时程分布与计算方法

Time-dependent Distribution of Hydration Heat Temperature Fields for Concrete Box Girders Under Pre-cool Fluent Model and Calculation Method

推导了混凝土水化热预冷流复合降热方程,建立了混凝土水化热预冷流模式。采用大型空间有限元程序AN-SYS,对浇注箱梁墩顶块混凝土水化热场进行时程分析,分析了温度峰值和温差峰值的时程变化规律,提出了实用计算公式。结果表明:预冷流模式可明显降低浇注混凝土的水化热温度峰值和温差峰值,缩短最大温度峰值出现的时间,而不改变温差峰值发生的时间。实用计算公式简单明确。

The pre-cool fluent equation of hydration heat for concrete was deduced,the pre-cool fluent model of hydration heat for concrete was built.The FEM procedure ANSYS was adopted,the hydration heat temperature field was analyzed by time-dependent relation,the time-dependent curve of maximum temperature peak value and minimum temperature peak value was studied.The studied results indicate： the hydration heat temperature peak value and he hydration heat temperature difference peak value can obviously reduced by way of pre-cool fluent model,short the occurrence time of the maximum temperature,the latter occurrence time can keep invariable.All in all,the calculation formula is simple.