工程科学学报2024，Vol.46Issue(2)：354-364,11.DOI:10.13374/j.issn2095-9389.2022.11.07.002
NC-UHPC组合梁抗冲击性能的数值研究
Numerical study on impact resistance of NC-UHPC composite beam
摘要
Abstract
Ultrahigh-performance concrete(UHPC)has become the most promising high-performance material,and has achieved excellent application in the field of impact and explosion protection engineering.Normal reinforced concrete(NC)beams subjected to impact load are prone to local punching shear failure.However,although the impact performance can be improved using UHPC beams,their application is limited by high costs.To achieve impact resistance at a lower cost,this work proposes a design scheme for locally replacing and wrapping NC beams with UHPC,with the aim of improving the impact resistance of NC beams.In this study,differing research conditions were employed(NC,UHPC,and NC-UHPC composite beams),and the impact resistance of specimens was compared and analyzed.Numerical models of NC and UHPC beams under impact loads were first established to verify the reliability of the modeling method,which is contact method,load application,initial velocity,boundary conditions,etc.The NC,UHPC,and NC-UHPC composite beam models were then established,and the impact performances of different NC-UHPC beam combinations were analyzed.The results revealed that compared with NC beams,the UHPC local replacement scheme effectively avoided local punching shear failure of beams.Under impact load,bending and shear cracks occurred on both sides,and the damage degree on both sides decreased with the increase of the local replacement length.For the UHPC wrapping,the failure mode of the beam changed from punching shear failure to bending failure.With an increase in UHPC thickness,the damage degree of the beam span increased,and it gradually reached that of the pure UHPC beam.Furthermore,both schemes effectively reduced peak displacement and residual displacement in the mid-span.Compared with the UHPC wrapping scheme,the peak displacement and residual displacement in the mid-span of the UHPC local replacement beam were reduced,and the mid-span bearing capacity was improved.Thus,we recommend that a local replacement length of more than twice the beam height should be selected to avoid the occurrence of local punching shear failure.关键词
超高性能混凝土/普通钢筋混凝土/组合梁/冲击荷载/冲剪破坏/弯曲破坏Key words
ultrahigh-performance concrete/normal reinforced concrete/composite beam/impact load/punching shear/bending failure分类
建筑与水利引用本文复制引用
伍敏,黄于倩,潘仁胜,金浏,杜修力..NC-UHPC组合梁抗冲击性能的数值研究[J].工程科学学报,2024,46(2):354-364,11.基金项目
国家自然科学基金资助项目(51822801,52208458) （51822801,52208458）
国家重点研发计划资助项目(2019YFC1511003) （2019YFC1511003）
