POZD涂层方形钢筋混凝土板抗接触爆炸试验研究

为研究聚异氰氨酸酯噁唑烷聚合物高分子材料（polyisocyanate oxazodone，POZD）涂层方形钢筋混凝土板在接触爆炸作用下的破坏模式和抗爆性能，对POZD涂层方形钢筋混凝土板进行接触爆炸条件下试验研究。试验中采用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11次独立的爆炸试验，分析了不同POZD涂层厚度对抗爆性能的影响，观测了钢筋混凝土板在不同装药量和不同POZD涂层厚度条件下的破坏模式和破坏特征，研究结果表明:涂层POZD钢筋混凝土板的主要破坏模式为钢筋混凝土板正面爆炸成坑，背面POZD涂层的圆锥状鼓起。POZD涂层鼓起主要是在爆炸冲击波作用下POZD涂层从基体板脱离并出现较大塑性变形所致。当冲击波荷载强度超过POZD材料的极限抗拉强度时，在涂层锥尖处形成较小的圆孔装剪切破坏，涂层的其他区域保持完好，从而让钢筋混凝土板不会产生较大范围的震塌破坏。在强冲击波荷载作用下利用POZD涂层仍然能够保持大变形、高塑性特性，可以通过自身的大变形很好地延长爆炸荷载的作用时间和耗散时间，吸收较大冲击波能量，从而约束混凝土震塌碎片，提高钢混混凝土板的抗爆性能。随着POZD涂层厚度增加，板的抗接触爆炸作用下的抗爆能力越强，临界震塌破坏装药量越多。研究结果可为工程应用及毁伤评估提供参考。

Experimental research on anti-contact explosion of POZD coated square reinforced concrete slab

In order to study the failure mode and anti-explosion performance of PODZ coated square reinforced concrete slabs under contact explosion, the PODZ coated square reinforced concrete slabs were tested under contact explosion conditions. In the test, the reinforced concrete slab commonly used in floor design in building structures was used as the research object. Through 11 independent explosion tests, the influence of different PODZ coating thickness on the anti-explosion performance was analyzed, and the reinforced concrete slab failure modes and damage characteristics were observed at different charges TNT mass and different PODZ coating thickness conditions. The results show that the main failure mode of the coated PODZ reinforced concrete slab is the crater of reinforced concrete slab on the front and the conical shape bulge of POZD coating on the back. The bulging of POZD coating is mainly due to the detachment of POZD coating from the base plate and large plastic deformation under explosion shock wave. When the shock wave load strength exceeds the ultimate tensile strength of POZD material, a small round hole shear failure is formed at the tip of coating cone, and the other areas of the coating remain intact, so that the reinforced concrete slab will not produce a large range of seismic collapse failure. Under the strong shock wave load, the POZD coating can still maintain large deformation and high plasticity, which can extend the action time and dissipation time of explosion load through its large deformation and absorb large shock wave energy, so as to restrain the concrete spall debris and improve the anti-explosion performance of steel-concrete concrete slabs. With the increase of the thickness of POZD coating, the stronger the anti-explosion ability of the plate under contact explosion, the more the critical collapse damage TNT mass. The research results can provide references for engineering application and damage assessment.