爆炸波与破片联合作用下砌块墙的损伤和防护

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

摘要:

基于ANSYS/LS-DYNA软件建立了混凝土空心砌块填充墙、破片和炸药的模型，并对其在由爆炸驱动的破片和由爆炸产生的冲击波作用下的损伤进行了数值模拟.分析了单独冲击波作用、单独破片作用及二者复合作用下混凝土空心砌块填充墙位移响应的差异，探究了不同砌块强度、空心砌块壁肋比、砂浆强度和钢丝网网格密度对混凝土空心砌块填充墙的位移响应的影响.给出了聚脲弹性体、聚脲弹性体与钢丝网联合加固二者加固效果的比较.结果表明：通过与试验对比验证，建模方式是可靠的；在破片和冲击波复合作用下，混凝土空心砌块填充墙的位移比二者线性叠加的位移更大；提高砌块强度等级、提高空心砌块的壁肋比对墙体抗爆有利；改变砂浆强度对墙体抗爆的影响微弱；加密钢丝网网格可显著提高其防护效果.

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.