Axial impact behavior of confined concrete filled square steel tubes using fiber reinforced polymer

IF 4 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Steel and Composite Structures Pub Date : 2021-01-01 DOI:10.12989/SCS.2021.38.2.165

Yitian Zhang, B. Shan, T. Kang, Yan Xiao

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引用次数: 3

Abstract

Existing research on confined concrete filled steel tubular (CCFT) columns has been mainly focused on static or cyclic loading. In this paper, square section CCFT and CFT columns were tested under both static and impact loading, using a 10,000 kN capacity compression test machine and a drop weight testing equipment. Research parameters included bonded and unbonded fiber reinforced polymer (FRP) wraps, with carbon, basalt and glass FRPs (or CFRP, BFRP, and GFRP), respectively. Time history curves for impact force and steel strain observed are discussed in detail. Experimental results show that the failure modes of specimens under impact testing were characterized by local buckling of the steel tube and cracking at the corners, for both CCFT and CFT columns, similar to those under static loading. For both static and impact loading, the FRP wraps could improve the behavior and increase the loading capacity. To analyze the dynamic behavior of the composite columns, a finite element, FE, model was established in LS-DYNA. A simplified method that is compared favorably with test results is also proposed to predict the impact load capacity of square CCFT columns.

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纤维增强聚合物方钢管约束混凝土的轴向冲击性能

现有的约束钢管混凝土柱的研究主要集中在静力或循环荷载方面。本文采用1万kN容量压缩试验机和落锤试验设备，对方形截面CCFT和CFT柱进行了静载荷和冲击载荷试验。研究参数包括粘合和非粘合纤维增强聚合物(FRP)包装，分别使用碳、玄武岩和玻璃FRP(或CFRP、BFRP和GFRP)。详细讨论了观察到的冲击力和钢应变的时程曲线。试验结果表明，在冲击试验中，CCFT和CFT柱的破坏模式与静载作用下的破坏模式相似，均表现为钢管局部屈曲和角部开裂。在静载荷和冲击载荷下，FRP膜均能改善结构性能，提高承载能力。为了分析组合柱的动力性能，在LS-DYNA中建立了有限元模型。提出了一种与试验结果比较良好的方形CCFT柱冲击承载力预测方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Steel and Composite Structures 工程技术-材料科学：复合

CiteScore

8.50

自引率

19.60%

发文量

审稿时长

7.5 months

期刊介绍： Steel & Composite Structures, An International Journal, provides and excellent publication channel which reports the up-to-date research developments in the steel structures and steel-concrete composite structures, and FRP plated structures from the international steel community. The research results reported in this journal address all the aspects of theoretical and experimental research, including Buckling/Stability, Fatigue/Fracture, Fire Performance, Connections, Frames/Bridges, Plates/Shells, Composite Structural Components, Hybrid Structures, Fabrication/Maintenance, Design Codes, Dynamics/Vibrations, Nonferrous Metal Structures, Non-metalic plates, Analytical Methods. The Journal specially wishes to bridge the gap between the theoretical developments and practical applications for the benefits of both academic researchers and practicing engineers. In this light, contributions from the practicing engineers are especially welcome.