基于Midas Civil的承台大体积混凝土温度控制及数值分析

大体积混凝土结构在施工过程中,由于混凝土的水化热反应,易出现内外温差,产生过大的温度应力,进而引起温度裂缝.针对混凝土水化热问题,以兑房河特大桥5#墩为例,提出承台大体积混凝土布设冷却管的温控方案,利用有限元软件Midas Civil进行水化热数值分析,并将理论计算值与现场温度监测结果进行对比分析.实践表明,兑房河特大桥承台在施工过程中采取的温控措施,取得了较好的效果,并为类似工程提供一定的指导意义.

Temperature Control and Numerical Analysis for Massive Concrete of Cushion Cap Based on Midas Civil

As a result of the concrete hydration thermal, it is easy to appear larger temperature difference between inside and outside and produce excessive temperature stress which will cause the temperature cracks in the process of construction of massive concrete structure. In view of the problem of concrete hydration, the article uses the bridge of Duifang River as an example to analyze the temperature values of theoretical calculation and field monitoring results through set cooling pipe as the temperature-lowering measure and use finite element software Midas Civil for numerical analysis. Practice shows that the cushion cap of the bridge of Duifang River＇ temperature control measure in the construction process has achieved good results, and can provide certain guiding significance for similar projects.