近场爆炸作用下核电厂安全壳穹顶钢筋混凝土板的抗爆性能

Blast Resistance of Containment Dome Reinforced Concrete Slab in NPP under Close-in Explosion

安全壳是核电厂的最后一道防线,其穹顶采用60°配筋混凝土进行设计和建造,配筋方式特殊。借助ANSYS/LS-DYNA,采用CONWEP爆炸模型,建立60°和普通配筋的混凝土板有限元模型,研究了近场爆炸作用下60°配筋混凝土板的动态响应,参数化分析了板厚、药量、钢筋屈服强度和混凝土强度等因素对60°配筋钢筋混凝土板抗爆性能的影响规律;对比研究了普通配筋和60°配筋混凝土板的中心挠度、变形和应力云图,基于数值分析结果,拟合得到两种配筋方式混凝土板中心挠度最大值与药量之间的关系曲线,利用回归分析得到其计算公式。研究结果表明:在相同含钢量的条件下,60°配筋混凝土板中心挠度最大提高60.22%,抗爆性能更强,拟合公式可以较好地预测60°配筋混凝土板的挠度变化。

The containment dome of the nuclear power plant (NPP) is the last barrier and designed with reinforced concrete in a 60° of configuration. This paper uses explicit dynamic finite element analysis software ANSYS/LS-DYNA to establish finite element model of the ordinary reinforced concrete slab and reinforced concrete slab of 60° of configuration (novel) with CONWEP explosion model. Dynamic responses of reinforced concrete slabs under close-in explosion are investigated. Base on the analysis of parameters, the effects of slab thickness, explosive charge, strength of concrete and reinforcing steel bar on the blast resistance of reinforced concrete slabs with 60° of configuration are analyzed. The central deflection, deformation and stress diagrams of ordinary and novel reinforced concrete slabs are compared, a relationship of the maximum central deflection of novel reinforced concrete slabs, the explosive charge and slab thickness, and the fitting formula are obtained and given. The results indicate that under the same explosive charge, the central deflection of novel reinforced concrete is increased by 60.22%, and the novel reinforced concrete slabs have better blast resistance, the fitting curve can preferably estimate the deflection of the novel reinforced concrete slab.