钢筋混凝土实心板桥桥面板水化热分析

Hydration heat analysis of reinforced concrete solid slab bridge deck

以湖北省五峰土家族自治县某钢筋混凝土实心板桥为工程背景,根据预计的混凝土浇筑结束时间和天气预报的最高温度、最低温度拟合一个正弦函数作为环境温度函数,采用Midas FEA建立三维实体有限元模型对桥面板的温度场和应力场进行分析。分析结果表明:在混凝土龄期为6h时桥面板达到最高温度,同时出现最大温度梯度;桥面板的温度应力尚未超过C40混凝土的抗拉强度设计值,其第一主应力最大值出现在桥面板底面的横向棱边上。通过本文的计算分析,可为相似钢筋混凝土实心板桥的水化热分析提供参考。

With a reinforced concrete solid slab bridge in Wufeng Tujia Autonomous County,Hubei Province as the engineering background,a sine function was fitted as the environmental temperature function according to the estimated end time of concrete pouring and the highest temperature and lowest temperature of the weather forecast.Midas FEA was used to establish a three-dimensional solid finite element model to analyze the temperature field and stress field of the bridge deck.The analysis results show that when the concrete age is 6h,the bridge deck reaches the maximum temperature,and the maximum temperature gradient appears.The temperature stress of the bridge deck has not exceeded the tensile strength design value of the C40 concrete,and the maximum value of the first principal stress appears on the lateral edge of the bottom surface of the bridge deck.The calculation and analysis in this paper can provide a reference for the hydration heat analysis of similar reinforced concrete solid slab bridges.