不同尺寸下再生骨料混凝土直剪性能及其损伤本构  

Direct Shear Behavior and Damage Constitutive Model of Recycled Aggregate Concrete at Different Sizes

作　　者：陈宇良[1,2] 刘杰 吴辉琴 姜锐[1] 晏方 CHEN Yuliang;LIU Jie;WU Huiqin;JIANG Rui;YAN Fang(College of Civil and Architecture Engineering,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;Liuzhou Dongfang Engineering Rubber Products Co.,Ltd.,Liuzhou 545005,Guangxi,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]柳州东方工程橡胶制品有限公司,广西柳州545005

出　　处：《硅酸盐学报》2022年第2期388-395,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51908141);中国博士后基金项目(2021M693854);广西自然科学基金(2019GXNSFBA245030);广西科技大学博士基金项目(校科博18Z09)。

摘　　要：以再生粗骨料取代率、试件尺寸为变化参数,设计并制作了45个再生骨料混凝土试件。通过直剪试验,观察了不同尺寸下再生骨料混凝土的破坏形态,分析了取代率和试件尺寸对再生骨料混凝土直剪性能和损伤本构的影响情况,建立了不同尺寸下再生骨料混凝土的损伤本构模型。结果表明:峰值变形、延性系数均具有明显的尺寸效应,普通混凝土损伤发展速度变慢,再生骨料混凝土损伤发展变快;随取代率的增加,峰值变形先减小后增大,延性系数先增大后减小,损伤发展规律与取代率不成线性关系。采用的本构模型能较好地反映不同尺寸再生骨料混凝土的剪切荷载–变形关系以及损伤演化过程。To investigate the effects of replacement rate and sample size on the direct shear performance and damage of recycled aggregate concrete(RAC),45 RAC specimens were manufactured.The failure modes of RAC with different sizes were characterized,and the effects of replacement rate and specimen size on the direct shear performance and damage constitutive model of RAC with different sizes were investigated via direct shear tests.The results show that the peak deformation and ductility coefficient have a size effect,the damage development rate of natural concrete becomes slow,and the damage development rate of RAC becomes faster.The peak deformation firstly decreases and then increases,while the ductility coefficient firstly increases and then decreases with the increase of the replacement rate.The damage development law does not have a linear relationship with the replacement rate.The constitutive model can well reflect the shear load-deformation relationship and the damage evolution process of the RAC with different sizes.

关 键 词：再生骨料 破坏机理 尺寸效应 直剪性能 损伤本构 

分 类 号：TU528.01[建筑科学—建筑技术科学] TU317.1