高温后钢管混凝土抗多次冲击力学性能试验研究

采用分离式霍普金森压杆(SHPB)装置进行常温和高温后(100℃,300℃,500℃和700℃)钢管混凝土多次抗冲击性能试验研究,通过测量试件的应变时程曲线和应力时程曲线,分析其高温后的抗冲击动力特性.试验结果表明,高温后钢管混凝土经历多次冲击后无明显强度劣化,仍具有良好的抗多次冲击力学性能,适合做为抗火灾倒塌与军事上抗高温和重复爆炸、冲击作用的结构。

Experimental Study on the Dynamic Behavior of Concrete-Filled Steel Tube after Exposure to High Temperatures under Multiple Impact Loadings

An experimental study on the impact resistance of concrete filled steel tube(CFT) after exposure to high temperatures(100 ℃,300 ℃,500 ℃ and 700 ℃) under multiple impact loadings was carried out by using a Split Hopkinson pressure bar(SHPB).The strain and stress versus time relation curves of CFT specimens were measured to experimentally analyze the dynamic behaviors of CFT under multiple impact loadings.The test results have shown that CFT after exposure to high temperature experiences no remarkable strength deterioration and has excellent impact-resistance to multiple impact loadings.Concrete filled steel tube is excellently suitable to resist the possible progressive collapse of structures on fire and the double actions of high temperature exposure and blasting or impact loading caused by military attacks.