砖墙抗爆炸冲击震动效应模型试验研究

Model experiments on blast shock vibration resistance of masonry wall

为研究砖墙在爆炸冲击震动作用下的破坏模式及阈值,据工程内砖墙实际情况建立简化的底部固定、周边无约束砖墙模型,在模拟爆炸震动冲击试验台上进行三方向单独作用的冲击试验,研究砖墙模型的动态响应及破坏时加速度峰值、作用时间。结果表明,遭水平向冲击时模型均表现为水平通缝破坏。破坏主要由受拉而非剪切所致。通过对试验结果分析,获得三个冲击方向独立作用下的破坏阈值。

In order to investigate the failure pattern and threshold value of masonry wall under blast shock vibration loads,according to the practical situation of masonry wall in engineering,simplified masonry wall models were established.Experiments under the shock loads acting seperately in three directions were carried out on a shock testing machine for simulating the blast.The dynamic responses of the masonry wall models under the action of shock and vibration as well as the peak values and operation time of acceleration at the moment of failure were investigated.The results show that,for the masonry wall with bottom fixed and all-around constraint unconfined under the load of horizontal shock,the failure displays the form of horizontal straight joint damage.The failure is mainly caused by tensile stress instead of shearing stress.The failure threshold value under the shock loads acting seperately in three directions was obtained by analysis on the experimental results.