中低速磁浮线路标准箱梁水化热温度测试及分析
Test and analysis of hydration temperature of standard box girder for medium-low meglev lines

为了避免磁浮箱梁在施工过程中的水化热温度过高并获得箱梁水化热温度的时程分布规律，在有限元计算的基础上对箱梁温度进行实时监测，并采取适当的控制措施以降低水化热温度的影响。研究结果表明：计算方法可以获得施工过程中的水化热温度，实测结果与理论计算吻合较好；磁浮箱梁水化热温度经历较快的温升阶段，随后进入相对缓慢的温降阶段；开始阶段箱梁截面应力为外侧受拉内部受压，到浇筑100 h后逐步转变为外侧受压内部受拉；采取有效的养护措施，选择合适的拆模时间对避免由于水化热温差而产生早期裂缝十分必要。
In order to avoid the high temperature of hydration heat and obtain the time history law of the maglev box beam in the construction process, a real-time monitoring of the box girder is conducted besides the finite element calculation. Appropriate control measures also were taken to reduce the influence of hydration heat temperature. The measurement and calculation results show that this calculation method can obtain the hydration heat temperature of the construction process. The measured results agree with the theoretical calculations well. The hydration heat temperature experienced a relatively rapid temperature rise stage and a slow temperature drop stage. The stress of the box girder is compression inside the section and tension outside the section at the beginning. The stress state is contrary to the beginning after pouring for 100 hours. Taking effective maintenance, selecting the appropriate formwork removal time is necessary to avoid the early crack due to hydration heat temperature