混合边界条件下混凝土结构温度应力仿真分析

The Simulation of Concrete Temperature Stress Field under Mixed Boundary Conditions

根据太阳辐射的日变化规律,仿真分析混凝土结构施工期及运行期温度场及温度应力。考虑了太阳辐射、气温、水化热、间歇期等因素,采用二维有限元方法编制了混凝土施工期温度场和应力场程序,将不同情况混凝土的温度场和应力场进行对比分析。计算结果表明,在仿真分析中考虑太阳辐射直接进入混凝土的混合边界方法与等效气温法有一定的差异。在实际工程中,由于混凝土浇筑层比较多,温度应力仿真分析需要大量的计算时间,因此提出了考虑太阳辐射热的实用算法。

According to the daily variation regularity of solar radiation,temperature and thermal stress field of the massive concrete structures is simulated during the construction and operation periods.Some factors are taken into consideration,such as solar radiation,air temperature,hydration heat,and intermittent period,and programming programs of temperature and stress field during concrete structures＇ construction period with the two-dimensional finite element method,the temperature and stress field of concrete under different circumstances will be compared and analyzed.The results show that the method of considering the solar radiation entering the concrete under mixed boundary condition is different from the method of equivalent temperature.In practice,because of numerous layers of pouring concrete,simulation of thermal stress requires a lot of computing time,therefore the practical algorithm of considering the solar radiation is put forward.