Axial Compression Experiments on Assembled Columns of CFRP Bilateral Flexible Flange Tubes

LIU Cheng-lin; LI Feng; LI Ruo-yu

doi:10.13204/j.gyjzg22011918

Volume 52 Issue 9

Sep. 2022

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LIU Cheng-lin, LI Feng, LI Ruo-yu. Axial Compression Experiments on Assembled Columns of CFRP Bilateral Flexible Flange Tubes[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(9): 10-17. doi: 10.13204/j.gyjzg22011918

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LIU Cheng-lin, LI Feng, LI Ruo-yu. Axial Compression Experiments on Assembled Columns of CFRP Bilateral Flexible Flange Tubes[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(9): 10-17. doi: 10.13204/j.gyjzg22011918

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Axial Compression Experiments on Assembled Columns of CFRP Bilateral Flexible Flange Tubes

doi: 10.13204/j.gyjzg22011918

College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China

Received Date: 2022-01-19
Available Online: 2023-02-06

Abstract

Abstract

In order to realize rapid longitudinal connection of composite thin-walled circular tubes, a lightweight all-composite flange joint was proposed. Three specimens were subjected to axial compression tests. Load-axial displacement curves were obtained, and the loading process and damage pattern of bolt-flange joints were analyzed. Then, axial compression tests were carried out on two assembled columns under the same boundary condition. The failure modes of the specimens were observed and the instability mechanism of the columns were analyzed. The results showed that under the same thickness design of the tube and flange, the flexure performance of the bolt-flange joint was significantly lower than that of the tube; compared with metal flanges, the failure modes of bolt yield or tube wall buckling were less likely to occur in the composite flange tube, and the junction of the flange and tube was the weak area of the composite flange joint, which was prone to material damage and had a great influence on the rotational stiffness of the joint; the assembled column could be regarded as a strut with a non-rigid connecting joint in the middle, and the change of rotational stiffness of the joint due to material damage had a direct impact on the overall stability of the strut; the lateral instability model of struts could be used to describe the instability mechanism of the assembled column.
- CFRP bilateral flexible flange tube,
- FRP flange connection,
- axial compression performance,
- overall stability

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References(33)

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