Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression

TANG Hongyuan; LIAO Jing; LIU Ruizhong; HU Xiaowei

doi:10.3969/j.issn.0258-2724.20210388

Volume 58 Issue 2

Apr. 2023

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Journal of Southwest Jiaotong University > 2023 > 58(2): 421-429.

TANG Hongyuan, LIAO Jing, LIU Ruizhong, HU Xiaowei. Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 421-429. doi: 10.3969/j.issn.0258-2724.20210388

Citation:

TANG Hongyuan, LIAO Jing, LIU Ruizhong, HU Xiaowei. Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 421-429. doi: 10.3969/j.issn.0258-2724.20210388

Citation:

TANG Hongyuan, LIAO Jing, LIU Ruizhong, HU Xiaowei. Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 421-429. doi: 10.3969/j.issn.0258-2724.20210388

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Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression

doi: 10.3969/j.issn.0258-2724.20210388

Institute of Structural Engineering, Xihua University, Chengdu 610039, China

Received Date: 12 May 2021
Rev Recd Date: 18 Oct 2021

Available Online: 07 Jan 2023

Publish Date: 13 Dec 2021

Abstract

Abstract

In order to promote the application of square concrete-filled double skin tube (SCFDST) columns with outer stainless steel tube in civil engineering, six groups of specimens with different outer tube thicknesses and different core concrete strength were tested under axial compression, and the failure modes, load–displacement curves, and load–strain curves were obtained. The influences of the width-to-thickness ratio of the stainless steel square tube, the strength of core concrete, and the restraint effect coefficient of stainless steel square tube on the ultimate bearing capacity of SCFDST short columns were further analyzed. Meanwhile, the influence of chamfer on the strength and ductility of specimens was discussed preliminarily, and the minimum thickness calculation method to avoid the inner tube buckling before the outer tube buckling was proposed. Finally, based on the test results and the data in the existing literature, a fitted formula for calculating the compressive capacity of SCFDST short columns was derived; the calculated results by the proposed method were compared with those by the simplified model in the literature and the main foreign specifications, to verify its effectiveness. The results show that with the width-to-thickness ratio decreasing from 34.9 to 20.9, the ultimate bearing capacity was increased by 98.5% on average. When the core concrete strength was increased from C40 to C60, the ultimate bearing capacity of the specimen was increased by 7.3% on average. Besides, the axial ultimate bearing capacity of SCFDST short columns increases linearly with the constraint effect coefficient. Compared with the simplified model in the literature, the formula obtained in this study can predict the bearing capacity of SCFDST short columns.

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References

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