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针对大跨径混凝土箱梁桥0号箱梁的特点,详细介绍分析了水化热温度场数值模拟过程中混凝土参数的取值以及边界条件的确定方法,以苏通大桥辅助航道桥的0号箱梁为例,利用ANSYS对其混凝土浇注后的温度场进行了数值模拟,并与实测值进行了对比。研究结果表明:混凝土硬化早期,温度随水泥水化的发展,经历了较快的温升阶段,到达最值后,进入缓慢的温降阶段,最值出现的越早,温降的速率越大;混凝土浇注后的最大内外温差与构件厚度和表面边界情况有关,构件厚度越大,表面散热条件越好,可达到的最大内外温差也就越大;新旧混凝土结合面处存在温度倒灌现象.混凝土养护期间,应根据箱梁混凝土水化热温度场的特点,对重要部位进行有针对性的养护。
According to the characteristics of the No. 0 box girder of the long-span concrete box girder bridge, the value of the concrete parameters in the process of numerical simulation of hydration heat temperature field and the method of determining the boundary conditions are introduced in detail. Taking No. 0 of Auxiliary Channel Bridge of Sutong Bridge As an example, the temperature field of cast-in-place concrete is simulated by ANSYS and compared with the measured value. The results show that in the early stage of concrete hardening, the temperature has experienced a rapid temperature rise stage with the development of cement hydration. After reaching the maximum value, it enters a slow temperature drop stage. The earlier the value appears, the larger the temperature drop rate The maximum internal and external temperature difference after concrete pouring is related to the thickness of the component and the surface boundary. The larger the thickness of the component, the better the surface cooling conditions, the greater the maximum temperature difference between the external and internal can reach; During conservation, should be based on the characteristics of the box girder concrete hydration temperature field, the key parts of the targeted conservation.