fib 2010的徐变系数模型分析

摘要

对徐变系数,分析和对比了fib混凝土结构模式规范的1990模型和2010模型.2010模型的数学形式有较大的改变,表示为基本徐变系数和干燥徐变系数的和形式,两个系数分别表示为若干因子的连乘形式,并分别对两个系数给出了相应的混凝土抗压强度和时间影响因子.2010模型显著加强了与混凝土抗压强度影响因子的反比关系,修正了1990模型低估低强度混凝土徐变系数以及高估高强度混凝土徐变系数的情况.%For creep coefficient,the 1990 model and 2010 model of fib concrete structure model were analyzed and compared.The mathematical model of the 2010 model had a great change,which was expressed as the sum of the basic creep and the drying creep,each creep coefficients respectively for a multiplicative form of a number of factors,and at the same time the two coefficients were given the corresponding compressive strength of concrete influence factor,and the time evolution equation.Fib 2010 model significantly enhanced the inverse proportional relation between the compressive strength and creep coefficient of concrete,amended before CEB-FIB 1990 model underestimated the low strength concrete and overestimated the creep coefficient of high-strength concrete.