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