轴向冲击荷载作用下钢管混凝土短柱的试验研究

Test Research of Concrete-Filled Steel Tube Column under Axial Impact Load

采用落锤式冲击试验机进行了42根钢管混凝土试件的抗冲击性能试验研究,通过测量试件的应变时程曲线和冲击力时程曲线,分析其抗冲击动力特性。试件在产生压缩变形的同时,其表面中下部多处出现局部鼓曲现象,钢管与内部混凝土之间产生相对侧移;在相同冲击荷载作用下,随着钢管壁厚增大,试件表面应变减小,钢管约束混凝土变形的效果显著;在低速冲击范围内试件所受冲击力峰值变化不大。试件破坏形态和实测结果表明,钢管混凝土具有良好的抗冲击力学性能,即具有较高的强度和屈服后承载能力,以及良好的塑性变形能力。

The impact behavior of 4,2 concrete-filled steel tube （CFST） specimens was studied using the lift hammer impact device. The stress and impact force time history curves of the tested specimens were recorded to analyze the impact behavior of CFST. When the specimens are impressed, bulge appears in several parts. The steel tube and the concrete have a relative displacement. Under the same impact load, strain decreases with increasing thickness of the steel tube, and the maximum value of impact force is merely fixed at low speed. The failure patterns and the recorded results demonstrate that the CFST has an excellent impact-resistant behavior, i.e. relatively higher strength, post-yield- ing strength and excellent plasticity.