基体强度对钢纤维单丝拉拔性能的影响  

Effect of Matrix Strength on Properties of Steel Single Fiber Pull-out Test

作　　者：陈沛然[1] 张亚芳[1] 李根[2] 

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]中山大学工学院,广东广州510275

出　　处：《中山大学学报（自然科学版）》2013年第6期68-74,80,共8页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(51278136);广东省科技计划国际合作项目(2011B050300019);广东省高等学校高层次人才项目(2050205);广州市教育局羊城学者项目(12A007G)

摘　　要：界面对钢纤维混凝土(SFRC)的宏观力学性能具有较大影响,尤其是钢纤维与混凝土基体间的界面层。文中分别建立混凝土基体和水泥砂浆基体的单丝拉拔模型,考虑了基体强度变化和骨料对单丝拉拔性能的影响。结果表明:基体强度越高,单丝拉拔试件的峰值荷载和界面最大黏结强度越大,而试件的拉拔韧度则越小。基体强度的变化对单丝拉拔损伤破坏过程影响甚微。与水泥砂浆基体相比,混凝土基体的单丝拉拔试件对基体的变化更为敏感。The interface plays an important role in the macro-mechanical properties of SFRC （ Steel Fiber Reinforced Concrete） , especially the interface layer between the steel fiber and concrete matrix. The pull-out numerical models with or without aggregates have been established, then the effect of matrix strength on pullout properties of single fiber and the influence of aggregate have been studied. The results indicate that the higher the matrix strength, the larger the peak load of specimen and the higher the inter- facial bond strength, but the pull-out toughness decreases. The variation of matrix strength has little im- pact upon the damage process of pullout procedure. The specimen with concrete matrix is more sensitive to the changes of matrix strength compared with cement.

关 键 词：界面 单丝拉拔 基体强度 骨料 黏结强度 拉拔韧度 

分 类 号：TU528.572[建筑科学—建筑技术科学]