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为改善结构柱抗冲击性能,设计了RC柱和外包钢管加固RC柱在不同轴压比下的抗冲击试验,比较了两种类型柱抗冲击性能差异。试验通过DHR-9401落锤式冲击实验机进行,运用力传感器、高速摄影机和应变片完整记录了冲击力时程曲线、轴力时程曲线、跨中挠度时程曲线和试件特定位置的应变时程曲线。同时运用三种通用动力非线性有限元软件MSC.Marc、ABAQUS和ANSYS/LS-DYNA对冲击试验进行了数值模拟。研究结果表明外包钢管加固RC柱抗冲击性能要明显强于RC柱,证明外包钢管加固RC柱是一种可行的抗冲击加固措施。ABAQUS建立的有限元模型和试验结果吻合最好,MSC.Marc次之,ANSYS/LS-DYNA稍差。但ANSYS/LS-DYNA可较好的模拟RC柱冲击破坏全过程,其他两种软件则较难实现。研究结果可为大型铁路站房抗脱轨列车撞击提供加固措施,并为选取适合的有限元软件进行抗冲击分析提供参考。
In order to improve the impact resistance of the structural column, the impact test of the RC column and the RC column with different axial compression ratios was designed, and the difference of the impact resistance of the two types of columns was compared. The test was carried out by DHR-9401 drop-hammer impact testing machine. The impact time-history curve, axial force time-history curve, mid-span deflection time-history curve and specimen specific location strain were recorded by force sensor, high speed camera and strain gauge Time curve. At the same time, three kinds of general dynamic nonlinear finite element software MSC.Marc, ABAQUS and ANSYS / LS-DYNA were used to simulate the impact test. The results show that the impact resistance of the RC column strengthened by the outsourcing steel pipe is obviously stronger than that of the RC column, which proves that the RC column with the steel pipe reinforced by outsourcing is a feasible anti-impact reinforcement measure. The finite element model established by ABAQUS is in good agreement with the experimental results, followed by MSC.Marc and slightly worse by ANSYS / LS-DYNA. But ANSYS / LS-DYNA can better simulate the whole process of RC column impact destruction, the other two kinds of software is more difficult to achieve. The results can provide reinforcement measures for anti-derailment trains of large railway stations and provide references for the selection of suitable finite element software for impact analysis.