方形钢筋混凝土板的近场抗爆性能

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...

Anti-explosion performances of square reinforced concrete slabs under close-in explosions

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.