UHPC梁抗冲击性能影响因素有限元分析  

FINITE ELEMENT ANALISYS OF INFLUENCE FACTORS ON IMPACT RESISTANCE OF UHPC BEAM

作　　者：王卫锋[1] 吴彦儒 郑小红[1] WANG Weifeng;WU Yanru;ZHENG Xiaohong(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学土木与交通学院,广州510640

出　　处：《低温建筑技术》2024年第6期132-137,共6页Low Temperature Architecture Technology

摘　　要：为研究配箍率、纵筋率、UHPC强度对UHPC梁抗冲击性能的影响,采用LS-DYNA软件,建立落锤冲击下的UHPC梁有限元模型,进行数值计算,分析对比其破坏形态、位移时程。结果表明UHPC中的钢纤维提高了梁的抗剪能力,导致配箍率对UHPC梁的冲击响应影响较小;当纵筋率小于1.0%时,破坏形态为少筋破坏,随着纵筋率增大,梁抗冲击能力增强,破坏形态转变为适筋破坏,跨中最大位移减少,但影响程度随着纵筋率增加而逐渐减少;UHPC抗压强度不同,梁的破坏模式有差异,当强度从100MPa增加到140MPa时,梁体破坏形态从落锤两侧出现斜向损伤转变为跨中受拉损伤。对于UHPC梁抗冲击设计,可减少箍筋的配置,而提高纵筋率或UHPC强度。In order to study the influence of stirrup ratio longitudinal reinforcement ratio UHPC strength on the im-pact resistance of UHPC beam,LS-DYNA software is used to establish the finite element model of UHPC beam un-der the impact of drop hammer.The results show that the steel fiber in UHPC improves the shear resistance of the beam,and the stirrup ratio has little effect on the impact response of the UHPC beam.When the longitudinal rein-forcement ratio is less than 1.0%,the failure mode is less reinforcement failure.With the increase of the longitudinal reinforcement ratio,the impact resistance of the beam increases,the failure mode changes to suitable reinforcement failure,and the maximum displacement in the span decreases,but the influence degree decreases gradually with the increase of the longitudinal reinforcement ratio.When the strength of UHPC increases from 100MPa to 140MPa,the damage mode of the beam body changes from oblique damage on both sides of the drop hammer to mid-span tensile damage.The impact resistance design of UHPC beam can reduce the configuration of the hooper and improve the ra-tio of longitudinal reinforcement or UHPC strength.

关 键 词：UHPC梁 抗冲击性能 纵筋率 跨中位移 

分 类 号：TU528[建筑科学—建筑技术科学]