爆炸荷载作用下砌体结构响应的有限元分析

对墙体模型进行简化,用单个混凝土砖块宽度的墙来代替所要分析的整面墙,并采用有限元分析软件LS-DYNA对砌体墙的破坏模式进行数值模拟分析。LS-DYNA的数值模拟结果显示,混凝土砌体墙在不同爆炸荷载作用下会发生不同程度的破坏,破坏的产生首先从墙体中部开始;随着爆炸荷载峰值的提高,砌体墙的破坏逐渐由中间向两端发展,当爆炸荷载峰值压力达到0.36 MPa及以上时,墙体会发生破坏,有块体飞出,并在重力作用下发生倒塌。数值模拟的结果与文献提供的试验结果比较吻合。

Finite Element Analysis of Response of Masonry Wall under Blast Loading

The aim of this article is to find out the failure modes and laws of the concrete masonry wall under different blast loadings,and provide reference for the structural design.Firstly,only one concrete block width wall was used to replace the whole wall to simplify the model and the powerful finite element method software LS-DYNA was used to simulate numerically the behaviors of the wall.The result indicates that the concrete masonry wall will be failure at different levels under the different blast loadings and the failures begin from the mid-span of the walls.It can be concluded that with the increase of the blast load,the failure point spread from the midspan to the edge gradually.When the peak pressure comes to 0.36Mpa,the debris will fly out from the wall and the wall will fall under the gravity.The analyses compare reasonably well with experimental results.