多次侧向冲击下双层钢管混凝土结构的响应分析

摘要

利用落锤试验研究了双层钢管混凝土组合结构在多次侧向冲击作用下的抗冲击性能，分析了该组合结构在侧向冲击下的变形机理，并获取了双层钢管混凝土试件在历次冲击过程中的冲击力时程曲线以及历次冲击后的整体变形和凹陷变形数据。试验数据表明：外层钢管及其厚度对该组合结构的抗冲击能力和整体弯曲变形的大小有显著影响；混凝土层有效限制了结构的凹陷变形。相比于传统的空钢管，双层钢管混凝土结构在多次冲击荷载作用下显示了良好的抗冲击性能———更小的整体和凹陷变形，以及较高的吸能能力。%Drop hammer impact test was carried out on concrete-filled double skin steel tubes to study the impact performance of this kind of composite structures under multiple transverse impacts.The deformation mechanism of the composite tubes was analyzed and the impact force-time history curves during each impact as well as the global and the local deformation data after each impact for the composite specimens were obtained.The experimental results show that the outer steel tube and its thickness influence significantly the impact resistance and the global bending deformation of the composite tube;the concrete layer restricts effectively the local deformation of the composite tube.Compared to traditional hollow steel tubes,concrete-filled double skin steel tubes demonstrate advanced impact performance with smaller global and local deformation but higher energy absorption capacity.