爆炸荷载作用下钢筋混凝土柱损伤FEM分析

采用有限元分析方法,对钢筋混凝土柱在爆炸荷载作用下的损伤程度进行了数值分析和评估,为建筑物抗爆设计和选择防爆安全距离提供一定的参考。采用有限元软件对钢筋混凝土框架柱在外部爆炸荷载作用下的非线性反应特征和损伤程度进行分析,采用一种塑性损伤模型,数值模拟分析时考虑材料的应变率效应。将混凝土框架柱的损伤划分为四个等级,并给出柱的防爆等级与距离的评估图。

DAMAGE ANALYSIS FOR RC COLUMN UNDER EXPLOSIVE LOADS

At present, the blast has become one of the main disasters that threat seriously society and human lives. A progressive collapse of RC frame structure maybe occur during a detonation event when an initiating localized failure causes adjoining members to be overloaded and fail, resulting in some damages disproportionate to the originating region of localized failure. Therefore, RC columns become one of the important members in RC structures. In the paper, the blast pressures under different explosive amount and various distances are calculated numerically. The responses and damages for the RC column under the explosive load are analyzed by the finite element method (FEM) to simulate numerically the behaviors of columns. The damages of the RC column are divided into four levels and the safe distance was given. The results of the simulation show that the proposed method is effective in analysis of RC members under blast loads.