（1 中国中元国际工程有限公司， 北京 100089； 2 新加坡国立大学土木工程系， 新加坡 117576）

［摘要］利用落锤冲击试验研究了钢管混凝土组合结构在两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，并获取了钢管混凝土试件在每次冲击过程中的冲击力时程曲线以及每次冲击后的跨中整体弯曲变形和凹陷变形数据。试验结果表明：钢管及其壁厚对钢管混凝土结构的抗冲击能力和整体弯曲变形的大小有显著影响；混凝土有效限制了结构的凹陷变形。通过无量纲量吸能系数，能够量化衡量钢管混凝土结构在每次冲击作用下的吸能能力。相比于的空钢管，钢-混凝土组合作用使得钢管混凝土结构在两次冲击荷载作用下显示了良好的抗冲击性能，即具有更小的整体弯曲和凹陷变形，以及很高的吸能能力。

［关键词］钢管混凝土； 组合结构； 抗冲击性能； 落锤冲击试验； 两次侧向冲击

中图分类号：TU317-2， TU398-9文献标识码：A文章编号：1002-848X(2018)22-0051-05

Dynamic response of concrete-filled steel tubes under twice transverse impacts

Wang Yu1,2, Qian Xudong2

(1 China IPPR International Engineering Co., Ltd., Beijing 100089, China; 2 Department of Civil Engineering, National University of Singapore, Singapore 117576, Singapore)

Abstract:Drop hammer impact test was carried out on concrete-filled steel tubes to investigate the impact performance of this composite structure subjected to twice transverse impacts. The deformation mechanism of the composite tube was discussed and the impact force time history curves during each impact as well as the global bending deformation and the local indentation data after each impact for the composite specimens were obtained. The experimental results demonstrate that the steel tube and its thickness influence apparently the impact resistance and the global bending deformation of the composite tube; the concrete core restricts effectively the local indentation of the composite tube. A dimensionless energy absorption factor was used to quantify the energy absorption capacity of the concrete-filled steel tube during each impact. Compared to hollow steel tubes, concrete-filled steel tubes exhibit advanced impact performance with smaller global and local deformation but higher energy absorption capacity due to the steel-concrete composite effect.

Keywords:concrete-filled steel tube; composite structure; impact performance; drop hammer impact test; twice transverse impacts

*新加坡国立大学一级学术研究基金项目(R-302-501-020-112)。

作者简介：王宇，博士，高级工程师，一级注册结构工程师，Email: wangyuwp@126.com。