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时变对流模式下混凝土厚壁结构内生热场分布

, PP. 64-69

Keywords: 桥梁工程,混凝土箱梁,时变对流模式,水化热温度场,风速

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Abstract:

针对高墩混凝土箱梁墩顶块水化热温度场分布状况,考虑了风速的影响,建立了时变对流热传导模式,利用ANSYS分别对时变对流换热系数和稳定对流换热系数下混凝土箱梁墩顶块水化热温度场进行了分析,总结了时变对流模式下混凝土箱梁墩顶块水化热温度场的分布规律,并与实测值进行了对比。研究结果表明时变对流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;混凝土箱梁墩顶块水化热温度分布以腹板、顶板、底板与横隔板的交合部分为球心呈层状向外逐渐减小;随着时间的延伸,水化热温度分布形状相似,相应区域内温度值降低;时变对流换热系数下水化热温度峰值出现时间约为56h,稳定对流换热系数下水化热温度峰值出现时间约为80h;风速对各测点的水化热温度峰值及其发生的时间影响较大,增大风速可降低水化热温度峰值,缩减温度峰值出现的时间。

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