聚脲涂覆钢筋混凝土板抗爆抗震塌性能试验研究

Experimental study on the anti-explosion and anti-seismic collapse performance of polyurea-coated reinforced concrete slabs

为研究改性聚脲涂覆钢筋混凝土板的抗爆抗震塌性能,开展了6 mm厚改性聚脲涂覆钢筋混凝土板的爆炸试验,获取了爆炸加载过程冲击波超压、结构背部加速度、背部中心点位移等结构响应时程特征。主要分析了药量和爆距对结构中混凝土震塌情况的影响,分析了钢筋混凝土板背部聚脲涂层脱黏鼓包现象,并讨论了聚脲增强下钢筋混凝土板在爆炸载荷下发生震塌破坏及聚脲涂层脱黏情况随比例距离增加的变化规律。结果表明:随着爆距减小,背部聚脲涂层损伤及钢筋混凝土板破坏程度增加,且爆距越小时增加程度越大;随着药量增大,背部聚脲涂层损伤程度及钢筋混凝土板破坏程度增加,且药量越大时增加程度越大;单一变量下比例距离增加使得作用在结构上的爆炸载荷能量增加,从而引起结构背部破坏加重;比例距离相近时,药量的增加起到影响结构破坏的主导作用,使得结构的震塌破坏及聚脲脱黏程度显著增大。

To investigate the anti-explosion and anti-seismic collapse performance of modified polyurea-coated reinforced concrete plates,an explosion test was conducted on 6 mm thick modified polyurea-coated reinforced concrete plates.The test measured the time-course characteristics of structural responses,including shock wave overpressure,structural back acceleration,and center displacement during the explosion loading process.The free-field overpressure signal confirms the magnitude of the explosion load,while the acceleration signal captures the behavior of structural vibrations.A high-speed camera records the test process and the resulting structural responses,and a laser displacement sensor measures the time curve of vertical displacement at the center point on the back of the structure.The analysis of the above test results examines the impact of TNT weight and burst distance on the collapse of the concrete structure.It evaluates the formation of craters on the explosion surface of the reinforced concrete plate and the debonding and bulging of the polyurea coating on the back.Additionally,the discussion explores how the polyurea coating enhances the performance of the reinforced concrete plate under explosive loads,focusing on the relationship between collapse damage and the proportion of coating debonding as the distance increases.The results indicate that as the blast distance decreases,the damage to the back polyurea coating and the reinforced concrete slab increases,with a more pronounced effect observed at shorter distances.Additionally,an increase in TNT weight correlates with greater damage to both the polyurea coating and the reinforced concrete slab,with heavier TNT resulting in a more significant degree of damage.An increase in single-variable proportional distance amplifies the energy of the explosive load acting on the structure,leading to exacerbated damage to the structure's back.When the proportional distances are comparable,the increase in TNT weight becomes the primary factor influencing structural damage,resulting in a significant rise in the extent of collapse and polyurea debonding.