摘要
试验主要利用ANSYS有限元方法,模拟分析了温变疲劳条件下,混凝土温度应力分布及其随时间的变化规律,以及含气量对混凝土温度应力的影响。研究结果表明:随着含气量的增加,混凝土内外最大温差和最大温度应力逐渐增大。低水灰比混凝土最大温差为10.5℃,最大温度应力为2.76MPa;高水灰比混凝土最大温差为15℃,最大温度应力为3.83MPa。不掺引气剂时,水灰比越低,混凝土传热时间越短,最大温度应力越小。
By using the finite element software of ANSYS, the time- dependent temperature stress distribution of concrete under the condition of temperature fluctuation was analyzed, so as to the influence of air content on temperature stress. The results show that higher air content leads to higher temperature difference and temperature stress. For the concrete with lower water to cement ratio, the highest temperature difference is 10.5℃,and the corresponding temperature stress is 2.76MPa. For the concrete with higher water to cement ratio, these two parameters could be as high as 15℃ and 3.83MPa. Without air entraining admixture, the lower is water to cement ratio the quicker is the heat transformation and the lower temperature stress.
出处
《低温建筑技术》
2008年第2期1-3,共3页
Low Temperature Architecture Technology
关键词
混凝土
温度应力
含气量
concrete
temperature stress
air content
