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Study on axial compression behavior of thin-walled pressurized steel pipe column.

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Title: Study on axial compression behavior of thin-walled pressurized steel pipe column.
Authors: Xu, Boxuan1 (AUTHOR), Wang, Haishen1,2 (AUTHOR), Jiang, Wu1,3 (AUTHOR), Zeng, Xianzhi1 (AUTHOR), Pan, Peng1,2,4 (AUTHOR) panpeng@mail.tsinghua.edu.cn
Source: Engineering Structures. Mar2026, Vol. 351, pN.PAG-N.PAG. 1p.
Subjects: Axial loads, Finite element method, Mechanical buckling, Compressive strength, Structural stability, Tubular steel structures
Abstract: Due to their high diameter-to-thickness ratio, thin-walled steel pipes often are prone to local buckling under axial compression, significantly limiting their load-bearing capacity. This study proposes a novel pressurized steel pipe column (PSPC). The PSPC installs a pressurized airbag inside the thin-walled steel pipe to improve structural stability, and its axial compressive behavior was investigated. Three quasi-static axial compression tests on PSPC specimens with varying internal pressures were conducted. The results demonstrated that internal pressurization increases the column's ultimate bearing capacity from 133.49 kN to 359.69 kN, representing an enhancement of approximately 169 %, by mitigating the negative effects of initial geometric imperfections and changing the local buckling mode. A finite element model was developed to validate experimental findings. A parametric study was conducted using yield strength, diameter-to-thickness ratio, and initial imperfections as parameters. Formulas to obtain the optimal internal pressure and estimate the ultimate compressive bearing capacity were derived based on the parametric analysis, and a practical design method for PSPC was provided, demonstrating the coupling effect between axial compression and internal pressure in enhancing thin-walled column stability. • A novel pressurized steel pipe column (PSPC) is proposed to improve buckling stability. • Internal pressure increases axial load-bearing capacity by 2.7 times in compression tests. • A validated FE model is used to analyze parametric effects on PSPC behavior. • Design formulas for optimal pressure and capacity prediction are proposed. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Due to their high diameter-to-thickness ratio, thin-walled steel pipes often are prone to local buckling under axial compression, significantly limiting their load-bearing capacity. This study proposes a novel pressurized steel pipe column (PSPC). The PSPC installs a pressurized airbag inside the thin-walled steel pipe to improve structural stability, and its axial compressive behavior was investigated. Three quasi-static axial compression tests on PSPC specimens with varying internal pressures were conducted. The results demonstrated that internal pressurization increases the column's ultimate bearing capacity from 133.49 kN to 359.69 kN, representing an enhancement of approximately 169 %, by mitigating the negative effects of initial geometric imperfections and changing the local buckling mode. A finite element model was developed to validate experimental findings. A parametric study was conducted using yield strength, diameter-to-thickness ratio, and initial imperfections as parameters. Formulas to obtain the optimal internal pressure and estimate the ultimate compressive bearing capacity were derived based on the parametric analysis, and a practical design method for PSPC was provided, demonstrating the coupling effect between axial compression and internal pressure in enhancing thin-walled column stability. • A novel pressurized steel pipe column (PSPC) is proposed to improve buckling stability. • Internal pressure increases axial load-bearing capacity by 2.7 times in compression tests. • A validated FE model is used to analyze parametric effects on PSPC behavior. • Design formulas for optimal pressure and capacity prediction are proposed. [ABSTRACT FROM AUTHOR]
ISSN:01410296
DOI:10.1016/j.engstruct.2025.122038