四边固支方形钢筋混凝土板抗爆试验研究

Experimental Research on Four-sides Fixed Square Slabs under Blast Loading

为研究四边固支方形钢筋混凝土板在爆炸波作用下的破坏模式和抗爆性能,对方形钢筋混凝土板在四边固支条件下进行不同爆炸距离作用和装药量下的试验研究。以建筑结构中楼面设计常用的钢筋混凝土板为研究对象,通过6个独立的爆炸试验观测钢筋混凝土板在不同装药量下的破坏模式和破坏特征。研究结果表明:在同一爆距条件下,随着装药量的增加,四边固支方形钢筋混凝土板的破坏程度逐渐增加;破坏模式为由背爆面细微裂纹逐渐发展为背爆面中心处混凝土崩落及裂纹且裂隙显著扩展,直至板中心处发生贯穿破坏、钢筋断裂;四边固支钢筋混凝土板的破坏不仅依赖于比例爆高,而且与爆高有关,同一比例距离下爆高越大、板试件的破坏越严重。

In order to research the damage mode and anti-blast performance of four-sides fixed square slabs,the damage of four-sides fixed square slabs under the condition of different blast distances and charge masses is explored through experiment. The common concrete slabs for building structures are used as the research object. The damage mode and damage characteristic were observed in six independent blast experiments. The results show that the slab damage level increases with the increase in charge mass at the same blast distance,the damage mode changes from small cracks on the bottom face to concrete spallation on the bottom surface,and the cracks extend evidently until the center of slab as well as steel bar fracture are damaged at last. The damage of slab depends on the scaled blast height and the blast height. Under the same scaled blast height,the more the blast height is,the more the serious damage of slab is.