钢管混凝土侧向冲击荷载下的变形分析及简化计算

Deformation Analysis and Simplifying Computation of Concrete-filled Steel Tube under Lateral Impact Load

通过落锤冲击试验及模拟仿真对简支钢管混凝土在冲击荷载下的跨中挠度进行了试验分析,得出了在不同冲击能量下的挠度曲线,并与ANSYS/LS-DYNA的数值模拟结果进行了比较;并应用试验结果及模拟数据得出了跨中挠度随约束效应系数和冲击能量的变化关系曲线;通过塑性和回归分析得出了在冲击荷载下的简支梁跨中挠度计算实用公式,这些结果对研究钢管混凝土其它性能及在实际防震减灾中的应用有重要参考价值。

This article analyzed the middle deformation of concrete-filled steel tube under impact load by drop hammer impaction experimentation and simulate emulation, got the deformation curve of different impact energy, and compared with the numerical simulate results of ANSYS/ LS-DYNA; from the numerual aspect the relation of middle deformation changed with constrain effect factor and impact energy is obtained according to the experiment result and simulated numerical; compute formula of middle deformation is elicited by applying regressing and plasticity analysis. These conclusions provide a reference value for other applications of concrete-filled steel tube and earthquake protection and reduction engineering.