材料参数波动对混凝土温度应力计算的影响

Effects of material parameters' fluctuation in calculating the thermal stress of concrete

考虑混凝土宏观不均匀性,假定材料参数波动服从有限区间正态分布,对有限元划分的网格中的各单元单独赋予材料属性,计算混凝土的温度应力分布,以考察混凝土不均匀性的影响。计算结果表明:温度应力方差随材料参数波动的增大而增大,不同材料参数的波动影响大小不同,影响最大者为热膨胀系数。

Presuming the material parameters＇ fluctuation obeys normal distribution in finite interval caused by the macro-heterogeneity of concrete, the finite elements are assigned material properties individually to calculate the thermal stress of concrete in order to examine the impact of heterogeneity of concrete.The results show that the thermal stress＇ variation increases with the material parameters＇ fluctuation increasing.The effects of different parameters＇ fluctuations are different.The coefficient of thermal expansion has the greatest effect among the parameters considered.