混杂纤维混凝土动态压缩性能试验及数值模拟研究  

Study on dynamic compression properties and numerical simulation of hybrid fiber reinforced concrete

作　　者：陈猛[1] 李艺[1] 卢哲安[2] 黄宪礼[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《混凝土》2015年第8期91-94,共4页Concrete

基　　金：中央高校基本科研业务费专项资金资助项目(N110301002);国家自然科学基金资助项目(51078065)

摘　　要：为了研究钢-聚丙烯混杂纤维混凝土(HFRC)的动态压缩性能及损伤机理,采用分离式霍普金森压杆(SHPB)装置进行了冲击压缩性能试验。试验得到了设计强度为CF50的HFRC和钢纤维混凝土(SFRC)两种材料在四个不同应变率下的应力-应变曲线,并从破坏应力、峰值应变、峰值韧度等方面进行分析,结果表明HFRC的动态力学性能优于SFRC。采用ANSYSLS-DYNA有限元程序,选用HJC本构模型模拟HFRC动态冲击压缩性能,在验证数值模拟精度的基础上重构材料的应力-应变曲线,数值模拟结果与试验结果基本吻合。通过模拟试件的破坏过程,得到了HFRC在动态冲击荷载作用下的损伤演化方式,为材料的动态损伤机理研究提供理论依据。The compression properties and the failure mechanism of steel - polypropylene hybrid fiber reinforced concrete （ HFRC ） by means of experiment with a split Hopkinson pressure bar （ SHPB ）. The design strength of HFRC and steel fiber reinforced concrete （SFRC） is CF50, The dynamic stress - strain curves of HFRC and SFRC were obtained at 4 different strain rates, and the failure stress, peak strain and peak toughness were also analyzed. The results show that the dynamic mechanical properties of HFRC better than SFRC. The stress - strain curves were established based on accuracy of numerical simulation by ANSYS/LS - DYNA finite element program, and the HJC constitutive model was applied to simulate the dynamic impact compression performance of HFRC. The evolution process of damage under dynamic impact loading was obtained through the simulation of the failure process of HFRC, which provided the theory for the damage mechanism of HFRC under dynamic loads.

关 键 词：混杂纤维混凝土 钢纤维混凝土 动态压缩性能 SHPB 数值模拟 

分 类 号：TU528.041[建筑科学—建筑技术科学]