冲击荷载下内衬八边形钢管空心钢筋混凝土柱的动力响应

以一种内衬八边形钢管空心钢筋混凝土柱为研究对象，在自主研发的无导轨式大型落锤试验机上，完成了3种不同边界条件、2种不同冲击高度以及2种不同轴压比的侧向冲击实验。研究了不同冲击高度、边界条件和轴压比下试件的破坏形态、冲击力时程曲线和跨中位移时程曲线，并选取一根普通空心钢筋混凝土试件与同条件的内衬钢管空心钢筋混凝土试件进行了对比。结果表明:用内衬钢管替代内置钢筋笼使得构件的抗冲击性能明显优于相应的普通空心钢筋混凝土构件，且在轴压比不超过0.3的范围内，轴压比的改变对冲击结束后本内衬八边形钢管空心钢筋混凝土试件的残余挠度影响不大。

Dynamic behaviors of a hollow reinforced concrete column with an inner octagon steel tube under lateral impact

A kind of hollow reinforced concrete column with inner octagon steel tube is considered as the object of this study. The experiments are carried out using a large drop testing machine which was designed by ourselves. The analysis parameters included the boundary conditions, the impact heights and the axial compression ratios. During the experiments, the time history curves of the impact force and the lateral deformation of specimens were recorded. As well as, the failure forms of specimens were observed after the impact tests. A common hollow reinforced concrete specimen was selected and compared with the hollow reinforced concrete column with inner octagon steel tube under the same conditions. The results show that the impact resistance of the hollow reinforced concrete columns with inner octagon steel tube is obviously better than that of the corresponding hollow reinforced concrete columns by using the inner steel tube instead of the built-in steel cage. Within the range of axial compression ratio not exceeding 0.3, the change of axial compression ratio has little effect on the residual deflection of hollow reinforced concrete columns with inner octagon steel tube after impact.