混凝土损伤参数的尺寸效应

Size effect of damage parameters of concrete structures

混凝土的损伤参数一般都是在实验室里,用标准试件由试验得到的,用标准试件做测得的混凝土的损伤参数来进行大体积混凝土结构的损伤分析是不合理的原因,指出研究大、小混凝土结构损伤参数的关系即损伤参数的尺寸效应问题的必要,并对混凝土结构损伤参数尺寸效应进行探讨,得到了有益的结论。

The damage parameters of concrete are widely used in the design and construction of concrete sturctures, and the damage parameters can be obtained in the laboratory with the standard specimens,but it is not rational to use those parameters in the practical concrete structures.The size effect of the original damage and the tensile damage limit of concrete structures are studied. It is concluded that the original damage and the tensile damage limit grow with the increase of the structure size,but the growth rate becomes gentle with the increase of the structure size. When the structure size is bigger than 500 mm×500 mm,the growth rate is less than 15‰,so the results obtained from the standard specimen of 500 mm×500 mm can be used for the mass concrete structures.