摘要
按龄期调整有效模量法是计算混凝土徐变问题的有效方法。本文针对该方法中的关键问题──老化系数ｘ的取值，提出了新的观点。运用考虑龄期影响的徐变本构理论与继效流动理论相结合的方法，推导了松驰系数Ｒ与徐变系数之间的非线性关系，通过对原有实验数据的重新拟合，得出了计算老化系数新的实用公式。运用该公式计算表明，无论是持荷时间较长还是持荷时间较短的情况，都与Ｂａｓｔｇｅｎ试验曲线吻合较好。在对分阶段施工的混凝土结构进行徐变分析时，采用该公式计算的老化系数ｘ值尤为合适。
Age-adjusted Effective Modulus Method is an efficient method used to solve concrete creep problems concept. This paper probes into the key problem of this method-the evaluating of aging coefficient x based on a new concept. The nonlinear relation between the relaxation ratio R and creep coefficient is obtained by using the constitutional theory of concrete creep considering age effect in combination with the visco-elastic and flow theory. A new formula for calculating the aging coefficient is constructed through regression of the experimental data. It is also proved that the result of this formula fits in with Bastgen's experimental data for either long or short loaded time. It is concluded that this method is more suitable for use in the creep analysis of concrete structures constructed stage by stage.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
1996年第3期12-23,共12页
China Railway Science
关键词
混凝土
徐变
按龄期调整
有效模量法
老化系数
Concrete Creep
Age-adjusted Effective Modulus Method
Aging Coefficient
Relaxation Ratio
Creep Coefficient
