基于H-J-C本构模型的混凝土球壳结构冲击响应分析  

Analysis on impact response for spherical shell structure of concrete based on H-J-C constitutive model

作　　者：胡佳鑫 陈虹羽 蒋友宝 Hu Jiaxin;Chen Hongyu;Jiang Youbao(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410004,Hunan)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410004

出　　处：《工程建设》2020年第11期12-16,共5页Engineering Construction

基　　金：国家自然科学基金资助项目(51678072);长沙理工大学土木工程重点学科资助项目(18ZDXK01)。

摘　　要：为研究高速冲击下混凝土球壳结构的响应随冲击球体半径变化的规律,本文基于H-J-C混凝土本构模型,采用LS-DYNA程序建立球体冲击下混凝土球壳结构的有限元模型,分析冲击过程中混凝土球壳结构的应力变化与变形情况。结果表明:基于H-J-C混凝土本构的有限元模型能够较好地模拟出混凝土材料在高速冲击下的力学行为;当冲击速度为20 km/s时,半径为0.2、0.3、0.5 m的球体均会对2 m厚的混凝土球壳结构造成较大的冲击破坏。其中,半径为0.3 m和0.5 m的球体均能击穿球壳;半径为0.2 m的球体虽没有击穿球壳,但依然会对球壳结构产生较大的冲击凹坑。To study the law of the response of the spherical shell structure of concrete under high-speed impact with the changing of the impact sphere radius based on the constitutive model of H-J-C concrete,a finite element model of spherical shell structure of concrete under sphere impact is established with LS-D Y N A program,while the stress change and deformation of spherical shell structure of concrete during the impact process is analyzed.The results show that the finite element model based on H-J-C concrete constitutive can well simulate the performance of concrete material under high-speed impact.When the impact speed is 20 k m/s,th e sphere with radius of 0.2 m,0.3 m and 0.5 m will have huge impact failure on the spherical shell structure of concrete with thickness of 2 m.Among different impact balls,the spheres with radius of 0.3 m and 0.5 m can puncture the spherical shell.Although the impact ball with radius of 0.2 m fails to penetrate the spherical sh ell,it still has huge impact pits on the spherical shell structure.

关 键 词：混凝土 球壳结构 冲击作用 动态响应 本构模型 

分 类 号：TU502.6[建筑科学—建筑技术科学]