摘要
制备了碳纤维网格增强超高性能混凝土(TR-UHPC),开展了纤维网格拉伸、UHPC拉伸、网格-UHPC拔出和TR-UHPC拉伸试验,并结合数值模型研究了TR-UHPC的拉伸刚化响应以及碳纤维网格和钢纤维协同作用。结果表明:TR-UHPC呈现出显著的应变硬化和多裂纹开展特性,拉伸强度、裂后刚度和延性有效提高;在钢纤维体积掺量为0.5%~1.5%时,TR-UHPC性能的提升主要由钢纤维桥连作用控制,当体积掺量为1.5%~2.0%时,纤维网格-UHPC粘结滑移性能起主要作用。数值模型考虑了包括纤维网格拉伸性能、UHPC拉伸应力-裂缝宽度响应、纤维网格-UHPC界面粘结滑移性能在内的主要作用机理,计算结果与实验结果符合较好。
Textile reinforced ultra-high performance concrete(TR-UHPC) with carbon textile and steel fiber was prepared. The tension stiffening behavior of TR-UHPC and synergistic effects of textile and short fibers were investigated by means of experimental and numerical studies on the mechanical characteristics of textile, UHPC, interfacial bonding and TR-UHPC composites. The prepared TR-UHPC exhibits a pronounced strain-hardening behavior with multiple cracking. The tensile strength, post-crack stiffness and ductility are apparently improved. The tensile behavior of TR-UHPC is mainly affected by the bridging mechanism of steel fibers as the volume fraction of steel fiber is increased from 0.5% to 1.5%. The bonding characteristics between textile and UHPC governs as the fiber volume fraction further increases to 2.0%. The numerical model incorporates the primary mechanisms including tensile properties of textile, stress-crack width relationship of UHPC and interfacial bonding between textile and UHPC. It is indicated that the simulated data by the model are in reasonable agreement with the experimental results.
作者
姚一鸣
翟梦超
董路遥
王景全
YAO Yiming;ZHAI Mengchao;DONG Luyao;WANG Jingquan(School of Civil Engineering,Southeast University,Nanjing 211189,China;Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education,Southeast University,Nanjing 211189,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第11期2364-2374,共11页
Journal of The Chinese Ceramic Society
基金
江苏省自然科学基金项目(BK20180383)
国家自然科学基金项目(51908120,U1934205)。
关键词
超高性能混凝土
纤维网格
拉伸刚化
应变硬化
协同效应
数值分析
ultra-high performance concrete
textile
tension stiffening
strain-hardening
synergistic effect
numerical analysis
