爆炸荷载作用下RC框架动态响应与破坏模式

Dynamic Response and Failure Mode of RC Frame under Explosion Load

摘要:

我国既有建筑面积达800亿m²，钢筋混凝土结构应用广泛，建筑面临爆炸荷载风险较高。提升结构抗爆性能是土木工程可持续发展及“一带一路”建设的迫切需求。针对现有研究缺乏RC框架抗爆性能分析方法的现状，利用有限元软件LS-DYNA建立三层三跨RC框架模型，分别对底层角柱及边柱施加20 kg炸药爆炸荷载（起爆点距构件几何中心1 m），分析其动态响应。结果表明：相同爆炸条件下，角柱与边柱受荷均会导致框架结构严重破坏。

Abstract:

The existing building area in China amounts to 80 billion square meters. Reinforced concrete structures are widely used, and buildings are at a relatively high risk of explosion loads. Enhancing the explosion resistance of structures is an urgent need for the sustainable development of civil engineering and the construction of the Belt and Road Initiative. In view of the current situation that existing research lacks an analysis method for the explosion resistance of RC frames, a three-story, three-span RC frame model is established by using the finite element software LS-DYNA. The explosion loads of 20 kg of explosives are respectively applied to the bottom corner columns and side columns (the starting point is 1 m away from the geometric center of the component), and the dynamic responses are analyzed. The result shows that under the same explosion conditions, the loading on both corner columns and side columns will cause severe damage to the frame structure.