接触爆炸作用下RC单向板抗爆加固的试验研究

Experimental investigation on anti-explosion strengthening of one-way RC slabs under contact explosion

钢筋混凝土(RC)单向板在桥梁结构的桥面板中有着广泛的应用;该类结构在全寿命周期内可能遭受由于偶然爆炸事故、爆炸恐怖袭击或军事打击等产生的爆炸荷载作用。进行了6块RC单向板在接触爆炸条件下的试验研究,主要考察不同装药量、碳纤维(CFRP)板加固及聚脲加固的影响,并得到了RC单向板的破坏模式和损伤参数。结果表明:随着炸药量的增加,RC单向板破坏程度加大,破坏形态由迎爆面爆炸成坑和背爆面层裂震塌转为冲切破坏;CFRP板加固RC单向板由于应力波反射形成的拉伸波使混凝土发生层裂,层裂块飞散造成了黏接界面剥离,未能起到较好的防护效果;而聚脲材料与混凝土黏接强度高且具有一定的吸波效能,在爆炸试验中能够减小RC板的损伤,防止混凝土层裂的混凝土飞散,防护效果更好。

One-way reinforced concrete(RC)slabs have wide applications in decks of bridge structures and may suffer from blast load due to accidental explosions,terrorist attacks,or military strikes throughout their life-cycle.In this paper,six one-way RC slabs were tested under the test condition of contact explosion with different charges and two strengthening techniques,such as CFRP plate strengthening technique and polyurea strengthening technique.Failure modes and damage parameters of one-way RC slabs were obtained.The results show that the damage degree of the one-way RC slabs increases with the increase of charge,and the failure mode changes from failure of the front surface with the cratering and the rear surface with spalling to the punching failure of the slabs.When the CFRP plate was used to strengthen the RC slabs,the interface between CFRP and RC slabs were peeled off as the result of the tensile wave formed by the reflection of the stress wave,therefore this technique fails to provide a good protective effect.When the RC slab was strengthened with polyurea after the first explosion,the strengthened slab shows better protective performance as the polyurea has excellent bonding performance with concrete and certain absorbing efficiency.