Experimental investigation on cantilever square CFST columns under lateral continuous impact loads

doi:10.1016/j.jcsr.2022.107416

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	Experimental investigation on cantilever square CFST columns under lateral continuous impact loads
	Feng, Zhujun 2; Wang, Xiuli 2,3; Zhang, Shengfu 1; Chu, Yunpeng 4
刊名	Journal of Constructional Steel Research
	2022-09-01
卷号	196
关键词	Concretes Failure (mechanical) Failure modes Nanocantilevers Prestressing Tubular steel structures Cantilever columns Concrete filled steel tube columns Concretefilled steel tubes (CFST) Continuous impacts Dynamic strain Impact loads Impact point Lateral continuous impact Square weathering concrete-filled steel tube Wall thickness
ISSN号	0143-974X
DOI	10.1016/j.jcsr.2022.107416
英文摘要	Concrete-filled steel tube (CFST) columns can be used in passive flexible protective engineering to improve the bearing capacity of the overall protective system. This paper conducted the lateral continuous impact resistance of cantilever square weathering concrete-filled steel tube (WCFST) columns and compared it with that of the normal CFST. Considering the effect of steel tube wall thickness and prestress on the lateral impact resistance of such components, a total of 10 specimens were subjected to impact tests. The damage form and failure mode of each member were studied in detail, and the effects of the different impact mass and the height of the impact point were considered. The dynamic strain, displacement, and acceleration of each member under different impact loads were analyzed and compared. It was found that tested members show local damage at the impact point, bent failure through whole members, and bulged or fractured at the root. Slippage occurs between the internal concrete and the steel pipe wall of the member without prestressing, and this phenomenon always occurred at the second impact. Results show that when the height of the impact point of members is 0.30 h, the position of the peak displacement point is 0.76 h, where h stands for column height. The application of prestressing can significantly reduce the dynamic strain, displacement, and acceleration of members. Under the same circumstances, applying to the prestress of cantilever members can control the final deformation of it more than increasing the wall thickness. Moreover, the smaller the wall thickness of the component, the better the effect of applying to prestress to control the plastic displacement. The final cumulative plastic displacement of the member is positively correlated with its stiffness degradation after each impact. © 2022 Elsevier Ltd
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159429]
专题	土木工程学院
作者单位	1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 3.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou; 730050, China; 4.Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang; 621010, China
推荐引用方式 GB/T 7714	Feng, Zhujun,Wang, Xiuli,Zhang, Shengfu,et al. Experimental investigation on cantilever square CFST columns under lateral continuous impact loads[J]. Journal of Constructional Steel Research,2022,196.
APA	Feng, Zhujun,Wang, Xiuli,Zhang, Shengfu,&Chu, Yunpeng.(2022).Experimental investigation on cantilever square CFST columns under lateral continuous impact loads.Journal of Constructional Steel Research,196.
MLA	Feng, Zhujun,et al."Experimental investigation on cantilever square CFST columns under lateral continuous impact loads".Journal of Constructional Steel Research 196(2022).