混凝土蠕变理论的有效模量法

龄期调整有效模量法是计算与砼蠕变有关的长期效应的有效方法，美国砼学全的 ２０９委员会也推荐这种方法用于精度要求高的计算。本文通过对砼构件的干缩应力的 计算，指出该方法不适用于具有复杂应力历史的问题和早龄期问题。

On Age-Adjusted Effective Modulus Method of Linear Creep Theory of Concrete

The Age-Adjusted Effective Modulus Method(AEMM) is most widely used sim -plified method for computing long-term effects associated with creep in concrete structures, which is adopted by ACI Committee 209 for cases of higher accuracy. Bazant claims that it is superior to all the other simplified methods. AEMM is misused to all creep problems, however. So a recursive formula for computing shrinkage stress in drying concrete members is derived. Results by the formula are compared with those by AEMM. It is concluded that AEMM is good for the cases of monotonic stress history but invalid for the creep problems with stress history of apparent reversals and ones of early age.