截面短长轴比对椭圆钢管混凝土柱抗爆性能影响

Anti-blast Performance of the Ratio of Short and Long Axis of Elliptical Concrete Filled-Steel Tubular Column

目的 研究椭圆钢管混凝土柱抗爆性能,分析截面短长轴比对其抗爆性能的影响。方法 利用LS-DYNA有限元软件建立TNT炸药-空气-椭圆钢管混凝土柱-刚性地面整体三维实体有限元模型,分别从短轴和长轴两个方向进行起爆设置,探究椭圆钢管混凝土柱受爆炸荷载作用后冲击波传递特性。结果 与双向刚度相同的柱子相比,椭圆钢管混凝土柱抗爆冲击波反射、衍射作用更为复杂;椭圆钢管混凝土柱沿长轴迎爆的抗爆性能明显优于沿短轴方向;绘制短长轴比-柱中侧向位移曲线,根据短轴方向与长轴方向抗爆性能差异,提出了设计宜采用的短长轴比为0.6~1.0;沿短轴向施加爆炸荷载时,短长轴比设计值不应小于0.4。结论 得出了不同短长轴比下构件破坏形态,进一步提出了采用短长轴比0.4~0.6内的椭圆钢管混凝土柱时,应采取加固措施。

Investigate the explosion resistance of elliptical steel pipe concrete columns,and to solve the effect of short-long shaft ratio of cross-section on its explosion resistance.LS-DYNA finite element software was used to establish a TNT explosive-air-oval steel pipe concrete column-rigid ground overall three-dimensional solid finite element model,and the detonation setting was carried out from the short axis and the long axis respectively,and the shock wave transmission characteristics of the oval steel pipe concrete column after being affected by the explosion load were explored.Compared with the columns with the same bi-directional stiffness,the explosion resistance shock wave reflection and diffraction of the elliptical steel pipe concrete column are more complicated;the explosion resistance of the elliptical steel pipe concrete column along the long axis is significantly better than that along the short axis direction;the short and long axis ratio-the lateral displacement curve in the column is drawn,and the short and long axis ratios suitable for design are proposed according to the difference between the explosion resistance of the short axis direction and the long axis direction It is between 0.6 and 1.0;when the explosion load is applied along the short axis,the design value of the short and long axis ratio should not be less than 0.4.The failure patterns of different components under the short-to-long axis ratio are obtained,and it is further proposed that reinforcement measures should be taken when using oval steel pipe concrete columns with a short-to-long shaft ratio of 0.4 to 0.6.