关键词: 徐变, 徐变恢复, 滞弹模, 新方法, 时间比例因子

Abstract: The informed methods of calculating concrete creep are analyzed, and a new calculation model of creep is proposed after synthesizing the research achievements of others.This method distinguishes elasticity of aggregate from hysteretic elasticity of mortar matrix; adopts Kelvin chain to display the aging action and the time of hysteresis on concrete;introduces time- ratio factor to take account of the response speed of time on hysteresis.Through the analysis in the case study, the results indicate that the variable process of concrete experiences hysteretic elasticity all time, but doesn' t do at the dead state;the time-ratio factor affects more obviously on concrete material characteristics under structure unloading or reloading conditions.

Key words: creep, recoverable creep, hysteretic/delayed elastic modulus, new method, time-ratio factor