内衬空八边形钢管的混凝土组合柱耐撞击性能

为研究内衬空八边形钢管混凝土组合柱的耐撞击性能,利用无导轨落锤式撞击试验机进行内衬八边形钢管混凝土组合柱耐撞击试验研究.试验过程中采用力传感器、高速摄像机记录撞击全过程中构件的撞击力时程曲线和跨中位移时程曲线.试验中观察边界条件、撞击能量、轴压比和圆钢管壁厚等因素对组合柱破坏形态与能量耗散的影响规律.试验结果表明:外包钢筋混凝土可与空八边形钢管和钢管混凝土相互协调,共同工作;在承受撞击荷载时,撞击高度对试件耗能能力的影响最为显著,边界条件次之,轴压比影响较弱,圆钢管壁厚影响最弱.

Performance of concrete composite columns with lining hollow octagon steel tube-reinforced on impact resistance

In order to study impact behaviors of the lining hollow octagon steel tube-reinforced concrete column, an experimental study on the impact resistance of the lining hollow octagon steel tube-reinforced concrete column without guideway was carried out by using a guideway falling weight impact testing machine. In the test process, the time history curve of impact force and displacement of specimens in the whole process of impact were recorded by using force sensor and high-speed camera. At the same time, the effects of boundary conditions, impact energy and axial pressure ratio on the failure pattern and energy dissipation of the steel tube-reinforced concrete column were also observed and investigated. Our tested results show that the outsourced reinforced concrete can work in coordination with hollow octagon steel pipe and steel pipe concrete. When bearing impact loading, the impact height has the most significant influence on the energy dissipation capacity of the specimen, followed by the boundary condition. The influence of axial compression ratio is weak, and the influence of the wall thickness of circular steel tube becomes the weakest.