环境因素对大体积混凝土温度变化影响规律试验与数值分析研究

Experimental and Numerical Analysis Study on the Influence of Environmental Factors on the Temperature Changes of Mass Concrete

以广东省深圳市某地铁车站项目为研究对象,针对三面侧墙进行大体积混凝土测温试验,分析不同环境温度下以及不同天气情况下,混凝土温度变化的特性,利用ABAQUS有限元软件,对混凝土温升过程进行模拟,通过改变环境温度条件,来拟合试验所得数据。结果表明,环境温度对混凝土温度的峰值、升温速度、降温速度等指标均有较大影响;在进行有限元模拟时,混凝土表面辐射换热系数在晴天与雨天会有较大差异,研究对大体积混凝土浇筑及裂缝控制提供了技术支撑。

Taking a subway station project in Shenzhen,Guangdong Province as the research object,temperature measurement test was carried out on the mass concrete of three side walls.The characteristics of concrete temperature changes under different ambient temperatures and different weather conditions were analyzed,ABAQUS finite element software was used to simulate the temperature rise process of concrete.The data obtained by the test were fitted by changing the ambient temperature conditions.The results showed that the ambient temperature had a great influence on the peak,heating rate and cooling rate of concrete temperature,and the radiant heat transfer coefficients of concrete surface would be greatly different between sunny and rainy days when performing finite element simulations,the study could provide technical support for pouring and crack control of mass concrete.