基于LS-DYNA的ECC管桩的抗冲击性能分析
Impact Resistance of ECC Pipe Piles Based on LS-DYNA
曾庆有 1叶晨峰 1刘俊俊 2冯凯 2程沛媛 1陈伟宏2
作者信息
- 1. 福建省交通规划设计院有限公司,福建 福州 350000
- 2. 福州大学 土木工程学院,福建 福州 350108
- 折叠
摘要
为研究工程水泥基复合材料(Engineering Cementitious Composite,ECC)管桩的抗冲击性能,采用Ansys/LS-DYNA对管桩受竖向落锤冲击作用进行模拟.基于静态拉压试验和动态压缩试验获得关键参数,建立ECC管桩的HJC(Holmquist-Johnson-Cook)本构模型,通过霍普金森压杆试验(Split Hopkinson Pressure Bar,SHPB)验证有限元模型的正确性.对不同锤体质量和冲击速度组合的管桩模型进行参数化分析,得到管桩在不同冲击能量下的位移、能量时程曲线和有效塑性应变图等动力响应.结果表明:在竖向冲击作用下,ECC管桩的最大残余变形只有高强混凝土(High-Strength Concrete,HC)管桩的66.0%,最小残余变形仅为HC管桩的13.7%;且ECC管桩释放的变形能占比平均为HC管桩的6.26倍.表明ECC管桩较HC管桩有更好的抗损伤能力和弹性恢复能力.
Abstract
To study the impact resistance of Engineering Cementitious Composite(ECC)pipe piles,this paper used ANSYS/LS-DYNA to simulate the impact of a vertical drop hammer on the pipe piles.The HJC constitutive model of ECC was established based on key parameters obtained from static tension and compression tests and dynamic compression tests.The correctness of the finite element model was verified by split Hopkinson Pressure Bar(SHPB)tests.The parametric analysis conducted on the pipe pile models compounded with different hammer mass and impact velocity yielded dynamic responses including the displacement,time-history curve of energy,and effective plastic strain diagrams of the pipe piles under various impact energies.The results show that under the action of vertical impact,the maximum residual deformation of ECC pipe piles is only 66.0% of that of high-strength concrete(HC)pipe piles,and the minimum residual deformation is only 13.7% of that;in addition,the proportion of deformation energy released by ECC pipe piles is 6.26 times that of HC pipe piles on average.These results show that ECC pipe piles have better damage resistance and elastic recovery ability than HC pipe piles.
关键词
管桩/工程水泥基复合材料(ECC)/抗冲击性能/LS-DYNA/高强混凝土(HC)Key words
pipe pile/ECC/impact resistance/LS-DYNA/high-strength concrete引用本文复制引用
基金项目
福建省交通科技计划项目(202021)
福州大学开放测试基金项目(2021T036)
出版年
2024
国家科技期刊平台
NSTL
万方数据