基于混凝土细观结构的徐变逐步分析  

Analysis of Creep Based on Concrete Microstructure

作　　者：谭景文[1] 向中富[1] 许航[2] 燕南[1] 

机构地区：[1]重庆交通大学,重庆400074 [2]中交公路规划设计院有限公司,北京100088

出　　处：《重庆交通大学学报（自然科学版）》2010年第3期375-378,424,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金："863"计划现代交通技术专题课题项目(2008AA11Z102)

摘　　要：分析了已有的混凝土徐变计算方法,提出了一种新的徐变计算方法,该方法分离了以骨料为主的弹性和以砂浆基质为主的滞弹性;采用了Kelvin链来模拟黏弹性并表现了混凝土的老化作用和滞后效应的时间;引入滞后效应时间比例因子考虑时间对混凝土滞后效应的响应速度。实例分析结果表明:混凝土结构变化过程受其滞弹性影响较大而最终状态几乎不受影响,时间比例因子在结构卸载或反复荷载的作用下对混凝土材料的特性影响明显。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.

关 键 词：徐变 徐变恢复 滞弹模 新方法 时间比例因子 

分 类 号：TU528.01[建筑科学—建筑技术科学]