侧向冲击作用下圆钢管-钢骨混凝土柱抗冲击性能研究

为研究钢管-钢骨混凝土柱的抗冲击性能，利用非线性有限元软件ABAQUS建立了圆钢管-钢骨混凝土柱数值模型。并与已有冲击试验进行对比验证，以保证建模方法的正确性。基于验证后的建模方法研究了侧向冲击作用下圆钢管-钢骨混凝土柱的抗冲击性能，重点分析了冲击质量、冲击速度、钢管壁厚、轴压比和长细比对圆钢管-钢骨混凝土柱抗冲击性能的影响，并对比分析了不同截面形式复合柱的抗冲击性能。结果表明：随着冲击质量和冲击速度的增大，冲击力峰值、冲击力平台值、跨中挠度及冲击力持续时间增长；合理增加钢管壁厚和内插钢骨可以明显改善柱的抗冲击性能;在用钢量和混凝土用量相同时，圆钢管混凝土柱抗冲击性能最优，圆钢管-钢骨混凝土柱次之，方钢管-钢骨混凝土柱较差。

Study on impact resistance of circular steel tube columns filled with steel-reinforced concrete under lateral impact

To study the impact resistance of steel tube columns filled with steel-reinforced concrete, a numerical model of circular steel tube columns filled with steel-reinforced concrete was established using nonlinear finite element software ABAQUS, which was compared with the existing impact experiments to ensure the accuracy of modeling method. Based on the verified modeling method, the impact resistance of circular steel tube columns filled with steel-reinforced concrete under lateral impact was researched, focusing on the influences of impact mass, impact velocity, steel tube wall thickness, axial compression ratio, slenderness ratio, and the impact resistance of composite columns with different section forms was compared and analyzed. The results show that with the increase of impact mass and impact velocity, the peak value and platform value of impact force, the mid-span deflection and the duration of impact force increase. The impact resistance of columns can be improved evidently by reasonable increase of wall thickness and inserting reinforcing steel. In case of equal amount of steel and concrete, the impact resistance of circular concrete filled-steel tube columns is the best, followed by circular steel tube columns filled with steel-reinforced concrete, while that of square steel tube columns filled with steel-reinforced concrete is the worst.