摘要
为了探讨钢筋混凝土板在爆炸载荷作用下的抗爆性能,对方形钢筋混凝土板在单向支撑条件下进行了近场爆炸加载实验,实验中采取TNT装药对钢筋混凝土板进行加载。并利用AUTODYN软件采用流固耦合算法,建立了混凝土和钢筋三维分离式实体模型,对钢筋混凝土板的动态响应过程进行数值模拟,且考虑应变率对钢筋和混凝土材料的动态本构特性的影响。模拟得到的钢筋混凝土板破坏现象与实验结果吻合较好。在此基础上,分析了不同质量的装药作用下钢筋混凝土板的损伤和破坏特征,合理展现了钢筋混凝土板从混凝土开裂、底部层裂碎片形成、钢筋屈服到混凝土板局部震塌的动态演变过程。研究结果表明,随着装药质量的增加,方形钢筋混凝土板的破坏模式逐渐由整体弯曲破坏转变为局部冲切破坏。
To identify the anti-explosion performances of reinforced concrete（RC） slabs,close-in explosion experiments were conducted for square RC slabs supported unidirectionally,in which the RC slabs were loaded by TNT charges.Based on the commercial hydrocode AUTODYN,a three-dimensional solid model including explosive,air and RC slab with concrete and reinforcing bars being separated was developed by using the gas-solid coupled technique to simulate the dynamic response of the RC slabs.In the numerical simulation,the strain rate effects were taken into account on the dynamical constitutive behaviors of the sophisticated concrete and reinforcing bar materials.Sequentially,the corresponding damage mechanisms and failure modes of the RC slabs were analyzed under different TNT charge weights.The dynamical evolution process of RC slabs was observed realistically from cracking and breaking-up of the concrete,yielding and rupturing of reinforcing bars to local perforation.The damage of the RC slabs by the numerical simulation is in good agreement with the experimental results.And with the increase of the TNT charge weights,the failure mode of RC slabs gradually changes from overall flexure failure to local punching failure.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2012年第3期251-258,共8页
Explosion and Shock Waves
基金
国防科技大学校预研基金项目(JC11-02-18)
关键词
爆炸力学
抗爆性能
爆炸载荷
钢筋混凝土板
破坏模式
mechanics of explosion
anti-explosion performances
explosion load
reinforced concrete slab
damage mode
