混凝土Johnson-Holmquist本构模型关键参数研究  

STUDY ON THE KEY PARAMETERS OF THE JOHNSON-HOLMQUIST CONSTITUTIVE MODEL FOR CONCRETE

作　　者：熊益波[1] 陈剑杰[1] 胡永乐[1] 王万鹏[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《工程力学》2012年第1期121-127,共7页Engineering Mechanics

摘　　要：在防护工程的定量分析中,确定合理的混凝土本构参数是提高计算和设计可靠度的基础。为此,采用理论分析、实验和数值模拟的方法研究了混凝土Johnson-Holmquist(JH)模型的参数取值问题,运用灵敏度分析识别了JH模型的关键参数,通过总结相关文献提供数据并进行统计分析确定了三段式经验状态方程,提出了通过假三轴实验获取极限面参数A、B、N、Smax的方法,并结合实验与文献数据确定了不同强度类型混凝土的极限面参数组,分析了被动围压SHPB实验中的应变率效应,拟合了应变率200s 1～500s 1范围的率相关参数。最后对工程计算中JH模型参数的取值提出了建议,并给出了3个数值计算案例。As for the quantitative analysis in protective engineering, it is a key issue to determine appropriate constitutive parameters of concrete to guarantee the reliability of calculation and design. For this purpose, theoretical analyses, experimental tests and numerical simulations are carded out to calibrate the parameters of the Johnson-Holmquist （JH） model for concrete. The key parameters of the JH model are identified preliminarily by sensitivity analysis. The three-segment empirical equation of state was determined by summarizing relevant experimental data from literature and statistical analysis. The method to obtain the failure surface parameters A, B, N, and Smax was established through pseudo triaxial tests, and the corresponding parameters of concrete with various strengths were acquired by material tests and literature data. The strain rate effect was analyzed based on the SHPB tests with passive pressures, and the fitting rate-dependent constant was presented at strain rates of about 200 s^-1-500 s^-1. Finally, the JH model parameters were recommended for engineering calculation, and three numerical examples were given.

关 键 词：爆炸力学 混凝土 JH模型 灵敏度分析 实验测试 数值模拟 本构参数 

分 类 号：O347[理学—固体力学] TU528.01[理学—力学]