接触爆炸作用下支撑式叠合结构抗震塌性能研究

Study on seismic collapse resistance of supported composite structure under contact explosion

常规武器作用下,地下构筑物主要在弹着点附近的局部区域发生破坏,并在迎爆面可能产生冲击或爆炸漏斗坑,同时在背爆面产生震塌漏斗坑,严重时则会产生贯穿破坏。提出了一种支撑式叠合结构,不同于在工业与民用建筑、水利水电工程、道桥及港口工程等领域中作为受力构件的叠合结构,支撑式叠合结构可以改变爆炸波的传播路径从而达到有效减少背爆面震塌破坏的目的。通过TNT装药爆炸试验和数值模拟研究,获取了支撑式叠合结构的抗震塌性能、破坏形态及爆炸波传播特征和传播路径,并与单层钢筋混凝土厚板的抗震塌性能进行对比分析。研究结果表明,同等药量作用下,相比于厚度相近的钢筋混凝土单层板,支撑式叠合结构的抗震塌破坏性能有显著提高。

Under the action of conventional weapons,the damage of underground structures mainly occurs in the local area near the impact point.Impact or explosion crater may occur in the front of the explosion,meantime collapse crater may occur in the back of the explosion,serious cases will produce penetrating damage.A supported composite structure was proposed,which is different from that used as a stress component in the fields of industrial and civil buildings,water conservancy and hydropower engineering,road and bridge and port engineering.The supported composite structure can change the propagation path of explosion wave to effectively reduce the collapse damage of back explosion surface.Through the test and numerical simulation of TNT charge explosion,the seismic collapse resistance,failure mode,explosion wave propagation characteristics and path of the supported composite structure were studied and compared with the anti⁃spalling performance of single⁃layer reinforced concrete slab.The results show that under the same charge,compared with the reinforced concrete single⁃layer slab with similar thickness,the seismic collapse resistance of the supported composite structure was greatly improved.