大体积混凝土温度场及温度应力的有限元分析

结合工程实例，采用ANSYS有限元软件对大体积混凝土浇筑及冷却过程中的温度场及温度应力进行了模拟，通过APDL语言编写程序控制了模拟过程．分析结果与工程计算及实际测试结果相近，验证了所建模型与选取参数的正确性，保证了运用ANSYS研究大体积混凝土水化热影响参数的可行性．分析发现：混凝土温度峰值与最大拉应力与浇筑温度呈正相关；采用低热量水泥时，可降低温度峰值、推迟峰值出现时间，并降低结构温度应力；环境温度变化时，温差成为关键因素，应根据实际情况制定季节性施工方案．

Finite Element Analysis of Mass Concrete Temperature Field and Thermal Stress

With a real project example, the temperature field and thermal stress field in the mass concrete pouring and cooling process was simulated and analyzed by using the finite element software ANSYS, and APDL language was used to write programs to control the simulation process. The simulation analysis results were similar with the results of engineering cal- culations and actual test, which verified the correctness of the finite element model and the selected parameters. Simultane- ously, the result also ensured that it is feasible to study the impact parameter of the mass concrete heat of hydration by finite element software ANSYS. Analysis found that the concrete temperature peak, the maximum tensile stress and the beginning of the pouring temperature were positively correlated： when using low-heat cement, it turns out that the temperature peak was lower, the peak time was delayed and the thermal stress was reduced. When ambient temperature changed, Temperature difference become a key factor, that was why seasonal construction program should be developed according to the actual situation.