摘要
由于冷却水管直径与坝体尺寸相差很大,采用一期水管冷却的混凝土坝施工期不稳定温度场和徐变应力场的有限元分析是很困难的.本文提出用随施工过程不断变化的粗细结合的多重有限元网格法解决这一问题.该法在通水的水管周围采用较密的网格,从而可以较好地反映水管的局部作用;对冷却水管停止通水的浇筑块,将网格由密变粗,从而可以用较少的单元对整个坝段进行分析.算例表明,该法计算精度能够满足工程要求.
It is difficult to analyze the transient thermal field and creep stress field of concrete dams with cooling pipes under constr? because of the great difference in sizes between cooling pipes and dams . A kinetic multi-mesh me? of FEM is proposed to solve this problem . With tills method , more elements are used around ? cooling pipes so as to consider the effect of the pipes 。 The whole dam can be calculated with ?ss ?iem?ts because large elements are used for the blocks in which pipe cooling has stopped . The examples show that the accuracy is satisfactory.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1991年第2期22-28,共7页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金
关键词
混凝土
坝
水管
冷却
施工
徐变
pipe cooling
construction of concrte dams
transient thermal field
creep stress field
