侧向冲击下实心夹层钢管混凝土柱力学性能研究

RESEARCH ON THE MECHANICAL PROPERTIES OF CONCRETE FILLED DOUBLE SKIN STEEL TUBE COLUMNS UNDER LATERAL IMPACT

利用有限元软件ABAQUS建立中空夹层钢管混凝土柱抗冲击有限元模型,考虑钢材和混凝土应变率效应,并分析轴力和冲击共同作用下其抗冲击性能。研究表明,该有限元模型结果与现有试验结果拟合较好。依据此模型建立方法研究了落锤侧向冲击实心夹层钢管混凝土柱的力学性能,并探讨了钢材屈服强度、混凝土强度等级、钢材应变率效应以及混凝土应变率效应对实心夹层钢管混凝柱抗冲击性能影响。分析结果表明:钢材屈服强度、钢材和混凝土应变率效应都会影响实心夹层钢管混凝土柱的抗冲击力学性能。而混凝土强度等级对于实心夹层钢管混凝土柱的抗冲击力学性能的影响并不明显。

Using the finite element software ABAQUS, the finite element model was established to analyze the impact resistance of concrete filled double skin steel tube columns （CFDSST） under axial force and impact force. The strain rate effects of steel and concrete were taken into account. The studies showed that the model could predict the test results with reasonable accuracy. Based on the model, the mechanical properties of concrete filled double skin steel tube columns under drop hammer lateral impact were investigated. The effects of the various factors, such as the yield strength of steel, the strength of concrete, the strain rate of steel and concrete on the impact resistance of CFDSST were studied. The results showed that the yield strength of steel, the strain rate of steel and concrete had some influence on the impact resistance of CFDSST. However, the strength of concrete had little influence on the impact resistance of CFDSST.