不确定因素影响下的混凝土结构温度场仿真计算方法

Simulation Method for Temperature Field of Concrete Structure with Influence of Uncertain Factors

混凝土结构前期仿真计算各控制参数存在着不确定性,若将其忽略,计算结果的准确性甚至温控方案合理性将受影响。根据这些不确定性因素具有区间分布特性且缺乏统计资料的特点,引入了区间数学理论,推导了相应的区间有限元公式。通过分析,在摄动理论和区间单调性理论的基础上,提出了所推导的区间有限元整体方程的近似"最窄"解区间的求解方法。考虑到实际工程中水管冷却的一些影响因素也存在不确定性,提出了考虑冷却方案区间变化的的水管冷却温度场迭代计算方法。利用Fortran语言编制了相应的区间有限元计算程序,对某现场非绝热温升实验块进行仿真计算,通过计算结果与实测数据的对比分析,验证了算法理论及程序的有效性和准确性。

The uncertainty of parameters in temperature control per-simulation is inevitable and affects the accuracy of calculation results and reasonable temperature control scheme. In order to solve this problem, a method of interval analysis was introduced for interval dis- tribution characteristics and the lack of statistical data for these uncertain factors, and corresponding interval finite element equation was derived as well. Based on perturbation theory and interval principle of monotony and studies of relationship between various uncertain parameters and concrete temperature field results, a method for ＂the most narrow＂ solution of whole interval equation was proposed. The iterative calculation method of concrete structure＇ s pipes cooling temperature field with uncertain cooling scheme was proposed. In- terval finite element simulation program was developed with Fortran, one site non-adiabatic temperature rise experiment was simulated with this program, and its effectiveness and accuracy were verified by the measured data.