Damage and Protection of Block Filled Wall Subjected to Synergistic Effects of Blast and Prefabricated Fragments

Abstract:

In order to explore the damage mechanism and protection technology of concrete hollow block filled wall subjected to the synergistic effects of blast and fragments, a model of block filled wall, fragment, and explosive was established by using ANSYS/LS-DYNA, and a numerical simulation of the damage caused by fragments and blast wave was conducted. The difference of the displacement response of the block filled wall under the action of shock wave, fragment, and a combination of the two was analyzed, and the influence of different block strengths, wall rib ratios of hollow block, mortar strengths, and mesh densits on the displacement response of block filled wall was investigated. The reinforcement effect between polyurea elastomers, polyurea elastomers and steel mesh reinforcement was compared. The numerical results show that the modeling method is reliable. The displacement of the masonry filling wall is greater than that of the two under the composite action of prefabricated fragments and shock waves. The increase of the strength of the block and the thickness of the thickened hollow block is beneficial to the anti explosion of the wall, and the strength of the mortar has little effect on the failure of the wall. The effect of steel wire mesh and polyurea elastomer joint reinforcement is better. Densified wire mesh has a better reinforcement effect.