AP1000屏蔽厂房在接触爆炸荷载作用下的非线性动力分析

Dynamic responses of AP1000 reinforced concrete shield building subjected to contact explosion

屏蔽厂房是AP1000核岛厂房的第一层外部防线,确保屏蔽厂房在服役期间遭受爆炸冲击荷载作用下的安全性和完整性,十分重要。本文中,采用欧拉-拉格朗日算法(coupled Euler-Lagrange,CEL),对炸药在屏蔽厂房20种不同起爆部位作用下的动态破坏特征进行了研究,以结构贯穿破坏的损伤质量作为损伤程度的判别依据,着重探讨在不同起爆位置作用下结构的压力和损伤演化特性。研究表明:在接触爆炸荷载作用下,厂房在起爆点附近发生局部破坏;在相同高度下,环向不同角度起爆所引起的损伤程度差异较小,不同高度起爆的损伤程度差异较大。通过压力和损伤的演化分析,确定了屏蔽厂房最不利抗爆部位,对厂房不同部位的配筋策略提出建议。结论可为制定屏蔽厂房在爆炸冲击荷载作用下的安全防护措施提供参考依据。

The reinforced concrete(RC) shield building is the first external defense layer of AP1000 structure. Therefore, the safety and integrity must be ensured during the plant life in any conditions such as the blast loading. In this study, the coupled Euler-Lagrange(CEL) method was used to numerically simulate the fluid and structure interaction(FSI) between air and AP1000 RC shield building. The dynamic response analysis of the 20 contact explosion positions of the shield building under explosive loads were carried out, and the damage mass was used to evaluate the damage. The evolution mechanism of pressure and damage mode were discussed. The numerical results clearly show that, under the contact explosive loads, the RC shield building has the local damage near the explosive point. The damage degree at the same height but with different circumferential angle are similar, while those in the same circumferential angle with different height are different. In addition,through analyzing the pressure and damage evolution, the strategy of the different parts of the plant reinforcement was proposed. These results might be helpful to understand the behaviors and characteristics of the AP1000 RC shield building under contact explosion and provide valuable references in design and engineering practice.