大体积混凝土温度控制与MIDAS建模参数调整分析

Temperature Control of Mass Concrete and Parameter Adjustment Analysis of MIDAS Model

大体积混凝土由于受温度应力的影响,严重时就会产生裂缝,针对这一问题,以某特大斜拉桥承台大体积混凝土施工为背景,通过有限元仿真计算分析,明确了承台混凝土结构的应力场和温度场的特征,提出了相应的温控标准和温控措施。同时,通过对4#承台仿真计算结果与实测进行分析对比,反复调整建模中的一些参数再进行反算,结果表明,参数调整后的温度场更加符合实际,并在后期5#承台浇筑中得到应用。为类似工程提供了有益借鉴。

Mass concrete is affected by temperature stress, and cracks occur when serious. In view of this problem, based on the construction of mass concrete of bearing cap of a super large cable stayed bridge, through the finite element simulation analysis, the characteristics of stress field and temperature field of concrete structure of concrete cap are defined, and the corresponding temperature control standards and temperature control measures are put forward. At the same time, the simulation results of 4# cap are compared with the actual measured results. Readjust some parameters in the modeling, and then do the inverse calculation. The results show that the temperature field after adjusting the parameters is more practical, and it is applied in the later 5# cap casting. It provides a useful reference for similar projects.