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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第5期    总第68期    2015年10月

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文章编号:1672-7029(2015)05-1172-07
考虑水管冷却的大体积混凝土承台温度控制研究
鲁正刚1,2,王修信1,2

(1.东南大学土木工程学院,江苏南京 210096;
2.东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京 210096
)

摘 要: 采用理论上较为完善的冷却水管对流换热系数计算模型考虑水管冷却作用,运用有限元程序对某一高墩连续刚构桥的大体积混凝土承台水化热温度场进行数值分析。将现场温度实测数据和仿真计算结果比较,两者吻合较好。研究承台内部温度梯度沿承台厚度方向和水平方向的时变规律,并对有无冷却水管作用的承台水化热温度场进行对比分析。研究结果表明:承台外表面是开裂的危险区域,施工中应做好保温保湿养护工作,严格控制承台内外温差在25℃以内;冷却水管降温效果显著,是大体积混凝土承台温控防裂的有效措施。拆模后经现场检查发现,承台表面未出现有害温度裂缝,温控效果良好。

 

关键字: 大体积混凝土承台;水管冷却;对流换热系数;温度场;数值分析

Analysis of temperature control for mass concrete bearingplatform with water pipe cooling considered
LU Zhenggang1,2,WANG Xiuxin1,2

1.School of Civil Engineering,Southeast University,Nanjing 210096,China;
2. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China

Abstract:Considering the water pipe cooling effect in the mass concrete bearing platform of a continuous rigid frame bridge,a sophisticated calculation model of heat transfer coefficient was adopted.Numerical analysis of the temperature field caused by hydration heat was simulated by finite element program and the calculation results show a good agreement with the in-site measurements.Then the variation law of inner temperature gradient along the height direction and longitudinal direction was analyzed,and the temperature field with water pipe cooling effect considered or not was compared. It is found that the surface of the bearing platform is the dangerous zone for temperature cracking. Hence the curing work of thermal insulation should be performed during the construction to control the temperature difference between interior and exterior within 25℃.The cooling effect of water pipe is remarkable and it is an effective measure for temperature control and crack prevention in the construction of mass concrete bearing platform. There is no thermal cracking after the removal of the formworks,which demonstrates that the effect of temperature control is satisfactory.

 

Key words: mass concrete bearing platform;water pipe cooling;heat transfer coefficient;temperature field;numerical analysis

ISSN 1672-7029
CN 43-1423/U

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