混凝土压缩损伤参数的尺寸效应分析  

Size Effect Analysis of Concrete Compression Damage Parameter

作　　者：邵兵[1] 王向东[1] 王跃锋[1] 刘梦和[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《济南大学学报（自然科学版）》2012年第3期315-318,共4页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金(50878077);"十一五"国家科技支撑计划(2008BAB29B03)

摘　　要：浇筑标准及非标准尺寸混凝土试件,以掺入引气剂模拟初始损伤,研究混凝土压缩损伤参数的尺寸效应,当非标准尺寸试件在m(引气剂)∶m(水泥)=0、0.001、0.002和0.003时,其弹性模量随引气剂量的增加而减小,分别为32.76、28.77、26.80和26.29 GPa,经由损伤理论对实验数据的拟合分析,得出混凝土的无损弹性模量为36.38 GPa,初始弹性模量为32.76 GPa,峰值弹性模量为26.7 GPa。拟合分析结果可验证损伤参数尺寸效应的一般规律,并可导出大尺寸试件的损伤参数。To study the size effect of damage parameters, initial damage is imitated by mixing air-entraining agent into the casting concrete specimens with standard size and nonstandard size. When the ratio of air-entraining agent and cement is 0,0. 001,0.002 and 0.003 in the specimens with non-standard size, the elastic modulus of concrete specimens gradually decreases with the increasing of air- entraining agent, corresponding to 32.76 GPa,28.77 GPa,26.80 GPa and 26.29GPa. Experimental data are analyzed and fitted by dam- age theory. And it can be calculated the undamaged elastic modulus（36.38 GPa） and initial elastic modulus（32.76 GPa） and peak e- lastic modulus （26.7 GPa） of the concrete specimens with above data. The fitting results show that the general rule of damage parame- ters is verified, and the damage parameters of larger specimens are deduced.

关 键 词：混凝土 压缩 试验 初始损伤 峰值损伤 尺寸效应 

分 类 号：TU528[建筑科学—建筑技术科学]