爆炸荷载作用下方钢管混凝土柱的动力响应分析

Dynamic Response Analysis of Concrete Rectangular Steel Tube Columns Under Blasting Loading

使用ANSYS/LS-DYNA软件,建立TNT炸药、空气域以及方钢管混凝土柱的三维计算模型,模拟钢管混凝土柱在爆炸荷载作用下的动力响应,得到方钢管混凝土柱的整体响应、柱中部位移、压力以及破坏模式.结果显示:在爆炸荷载作用下,方钢管混凝土柱中部破坏最为严重,为弯曲破坏;柱脚发生剪切破坏;柱顶端出现高应力区,但并未发生严重破坏.说明由于钢管对于核心混凝土的约束作用,柱子的韧性和塑性得到较大幅度的提升.

3D calculation model of TNT explosive,air domain and concrete rectangular steel tubular column are established by software ANSYS/LS-DYNA. To obtain the overall response and central displacement of concrete rectangular steel tubular columns,pressure,and failure mode,the dynamic response of concrete rectangular steel tube columns under blast loading is simulated. The results show:that the explosive destruction in middle part of the steel tube concrete column is most serious, which is bending failure;the root of column shear is failure;the high stress area exists in the column top,but has no serious damage. The results of this study show that,due to the steel tube,concrete filled steel tube has higher toughness andplasticity in three dimensional stress states.