轴向冲击荷载下中空夹层钢管混凝土的动态力学性能分析  

Analysis on dynamic mechanical properties of concrete-filled double-skin steel tube under axial impact loading

作　　者：宗周红[1,2] 李佳奇 任逸文 李明鸿[1,2] 甘露[1,2] Zong Zhouhong;Li Jiaqi;Ren Yiwen;Li Minghong;Gan Lu(Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education,Southeast University,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学爆炸安全防护教育部工程研究中心,南京211189 [2]东南大学土木工程学院,南京211189

出　　处：《东南大学学报（自然科学版）》2022年第5期883-889,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52178462);国家重点研发专项基金资助项目(2021YFC3100700)。

摘　　要：为研究中空夹层钢管混凝土在轴向冲击荷载下的受力性能,利用直径75 mm的分离式霍普金森压杆(SHPB)对中空夹层钢管混凝土进行了不同冲击速度的动态压缩试验,建立了SHPB试验的数值模型,研究了材料强度、外钢管厚度、空心率等参数对中空夹层钢管混凝土动态力学性能的影响.结果表明:轴向冲击荷载作用下,中空夹层钢管混凝土试件完整性较好;随着撞击速度的提高,中空夹层钢管混凝土的动态抗压强度增大但增长幅度减缓;材料强度、外钢管厚度和空心率对中空夹层钢管混凝土动态抗压强度影响显著;建议的中空夹层钢管混凝土动态应力-应变本构模型能够反映此类试件在轴向冲击荷载下的动态力学行为,可供工程设计及分析参考.To study the mechanical performance of concrete-filled double-skin steel tube(CFDST) under axial impact loading, dynamic compression tests on CFDST at different impact speeds were carried out by using the split Hopkinson pressure bar(SHPB) with the diameter of 75 mm. The numerical model of the SHPB tests was established. The effects of the material strength, the outer steel tube thickness and the hollow ratio on the dynamic mechanical properties of CFDST were studied. The results show that CFDST specimens maintain good integrity under the axial impact loading. With the increase of the impact speed, the dynamic compressive strength of CFDST increase while the growth rate tends to slow down. The material strength, the outer steel tube thickness and the hollow ratio have significant influences on the dynamic compressive strength of CFDST. The proposed dynamic stress-strain model of CFDST based on the existing models can basically reflect the dynamic mechanical behavior of CFDST under axial impact loading, thus providing the references for engineering design and analysis.

关 键 词：冲击荷载 中空夹层钢管混凝土 SHPB试验 数值模拟 动态本构模型 

分 类 号：TU317[建筑科学—结构工程]