Abstract：To study the seismic behavior of circular steel tubular columns after being impacted, the quasi-static tests were carried out on nine circular steel tubular columns after being impacted and three specimens without being impacted, with the impact angles (0°, 45°, and 90°) and axial compression ratios (0.4, 0.6, and 0.8) as the main design parameters. The failure modes were observed, and the hysteretic curves and skeleton curves were obtained as well. The influences of different parameters on the ultimate bearing capacity, failure modes, ductility, stiffness degeneration, and energy dissipation of specimens were studied. Test results indicated that the failure parts of steel tubular columns after being impacted were mainly concentrated at the plastic hinge areas, exhibiting the bulge and rupture of steel tubes at the bottom of columns. Compared with steel tubular columns without being impacted, the hysteresis loops of steel tubular columns after being impacted were less full, ductility and energy dissipation decreased remarkably, ultimate bearing capacity and stiffness decreased to some extent, but not significantly. The axial compression ratio affected the hysteretic behavior of steel tubular columns. With the increase of axial compression ratio, ultimate bearing capacity of the specimen decreased, stiffness deteriorated quickly, ductility and energy dissipation decreased significantly. Consequently, the axial compression ratios should be limited strictly to ensure sufficient ductility and energy dissipation of circular steel tubular columns.
郭展 李志慧 陈誉. 不同冲击角度作用后的圆钢管柱滞回性能试验研究[J]. 土木工程学报, 2020, 53(11): 81-91.
Guo Zhan Li Zhihui Chen Yu. Experimental study on hysteretic behavior of circular steel tubular columns after #br#
impacts of different angles. 土木工程学报, 2020, 53(11): 81-91.
