5级人防口部粘钢封堵接头抗爆实验研究

Anti-blast capabilities of the gateway of a grade-5 civil defense structure closed up by bonded steel plates

通过粘钢实现一典型汽车库人防口部封堵的设计方案,并对原设计方案进行相似设计后,对粘钢接头结构实验模型在核爆炸压力模拟器中进行模爆实验,得到沿竖向支座钢板的位移和应变时程曲线,并和有限元数值解进行了对比,其结果均较吻合,通过沿竖向支座钢板的应变分布规律得到钢板-混凝土界面之间的粘结应力;检验了在5级人防爆炸冲击波作用下,混凝土墙与钢板间粘结面承载力的可靠性;分析了5级人防爆炸荷载作用下支座钢板沿竖向应力的分布规律,为确定混凝土墙与钢板之间粘结应力的计算方法提供了参考。

The study aimed to explore the gateway design plan for civil defense structure of a typical garage closed up by bonded steel plates. According to this design plan, an experimental model for the steel plate-to-concrete bonded joint structure was proposed to perform an on-site test in an imitated nuclear blast pressure container. The displacement-time curves and the strain-time curves along the vertical supporting steel plates were obtained, which are in agreement with the numerical results by the finite element method. And the bond stresses on the interfaces between the steel plates and the concrete were achieved from the strain distributions along the vertical supporting steel plates. The study examined the supporting reliability of the contact surface between the concrete wall and the steel plate, analyzed the bond-stress distribution along the vertical supporting steel plate subjected to the grade-5 civil defense blast shock wave. The researched results provide a reference to calculate bond stresses between concrete walls and steel plates.