Performance and design of eccentrically-loaded concrete-filled round-ended elliptical hollow section stub columns

Shen, Qihan; Wang, Jingfeng; Wang, Wanqian; Wang, Zhibin

doi:10.1016/j.jcsr.2018.07.025

Cited by 35 publications

(8 citation statements)

References 27 publications

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“…Round-ended reinforced concrete columns have a suitable major-minor axis distribution, a low flow resistance coefficient, and an attractive appearance; thus, this structure has been employed extensively as piers and columns in bridge engineering over the past decades [1][2][3]. However, building it is a highly difficult procedure that requires substantial formwork, particularly at the beam-column joints.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Concrete-Filled Steel Tube Columns with Multiple Chambers and Round-Ended Cross-Sections under Axial Loading

Liu,

Zhang,

Pan

et al. 2024

Buildings

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Concrete-filled round-ended steel tubes (CFRTs) are a unique type of composite stub columns, which have the advantage of aesthetics and a well-distributed major–minor axis. Thus, the structure has been widely employed as piers and columns in bridges. To improve the mechanical performance of CFRTs with a large length–width ratio and to enhance the restraint effect of steel tubes on concrete, this study investigates the compressive property of multi-chamber, concrete-filled, round-ended steel tubular (M-CFRT) stub columns using a combination of experimental and numerical analyses. A detailed compression test on eight specimens is conducted to examine the compressive property of M-CFRT stub columns. The study focuses on understanding the influence of some key parameters on ultimate bearing capacity, failure stage, damage modes, and ductility. Additionally, the accuracy of the finite element modeling method in simulating the ultimate bearing capacity of the structure is verified. Finally, the calculating formula for the ultimate bearing capacity of M-CFRT stub columns is proposed on the basis of the experimental and numerical findings. Results of the formula calculation are consistent with the experimental data. These research findings serve as a valuable reference for designing similar structures in engineering practice.

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Section: Introductionmentioning

confidence: 99%

Behavior of Concrete-Filled Steel Tube Columns with Multiple Chambers and Round-Ended Cross-Sections under Axial Loading

Liu,

Zhang,

Pan

et al. 2024

Buildings

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“…Zhang et al [ 6 ] introduced a fiber beam column model to simulate the nonlinear performance of RE-CFST columns, a model that underwent validation through numerous examples. In a separate study, Wang et al [ 7 ] performed a numerical analysis on eccentric compression in RE-CFST columns. Their analysis delved into the impacts of parameters such as diameter-to-thickness ratio, load eccentricity ratio and section slenderness ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and numerical analysis on axial compression of round-ended concrete filled CFRP-aluminum tube columns

Wang,

Tang,

Qiu

et al. 2023

PLoS ONE

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To enhance the concrete confinement ability of circular-ended aluminum alloy tubes, carbon fiber reinforced polymer (CFRP) was bonded onto the tube surface to form CFRP confined concrete columns with circular ends (RCFCAT). Eight specimens were designed with number of CFRP layers and section aspect ratio as variables. Axial loading test and finite element analysis were carried out. Results showed CFRP delayed buckling of the aluminum alloy tube flat surfaces, transforming inclined shear buckling failure into CFRP fracture failure. Specimens with aspect ratio above 4 experienced instability failures. Under same cross-section, CFRP increased axial compression bearing capacity and ductility by up to 30.8% and 43.4% respectively. As aspect ratio increased, enhancement coefficients of bearing capacity and ductility gradually decreased, the aspect ratio is restrictive when it is less than 2.5. CFRP strengthening increased initial axial compression stiffness of specimens by up to 117.9%. The stiffness decreased gradually with increasing aspect ratio, with most significant increase at aspect ratio of 4. Strain analysis showed CFRP bonding remarkably reduced circumferential and longitudinal strains. Confinement effect was optimal at aspect ratio around 2.0. The rationality of the refined FE model established has been verified in terms of load displacement curves, capturing circular aluminum tube oblique shear buckling, concrete "V" shaped crushing, and CFRP tearing during specimen failure. The parameter analysis showed that increasing the number of CFRP layers is one of the most effective methods for improving the ultimate bearing capacity of RCFCAT.

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“…14 However, due to the ease of the connection to the beams, rectangular CFST columns are widely adopted in composite construction. 20,21 Considering this researchers also investigated various cross-sections of CFST columns such as elliptical section, [22][23][24] hexagonal section, [25][26][27][28] roundended CFST columns, [29][30][31][32] and octagonal section. [33][34][35][36] In combining the advantages of circular CFST columns and square outer sections, square CECFST columns were subsequently proposed.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies of axially loaded square concrete‐encased concrete‐filled large‐diameter steel tubular short columns

Kong²,

Ahmed

et al. 2022

Structural Concrete

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This article presents experimental and numerical studies on the axial compressive behavior of square concrete‐encased concrete‐filled steel tubular (CECFST) short columns composed of a circular inner steel tube. Tests on six full‐scale short CECFST columns with the inner circular tube diameter varying from 320 to 500 mm were carried out to study the influences of sectional diameter and the tube thickness of circular CFST columns on their axial performance. A theoretical model is developed using fiber analysis method and validated against a large test database. The accuracy of various codified design models is evaluated and a simple model is proposed to calculate their ultimate strengths. Test results show that CECFST columns have improved load carrying capacity and can sustain large axial loads without significant strength degradation. In addition, increasing the thickness of the steel tube significantly improves the composite action of the steel and concrete of the inner CFST column, which increases the compressive strength of CECFST columns by 27.3%. However, the rate of increase in the compressive strength of the core concrete of the CFST column has been found to be higher for the column with a smaller local slenderness ratio. The ductility of CECFST columns is influenced by the concrete strength and the spacing of the stirrups. Furthermore, the design model suggested in this study can provide a better estimation than the codified design models.

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Performance and design of eccentrically-loaded concrete-filled round-ended elliptical hollow section stub columns

Cited by 35 publications

References 27 publications

Behavior of Concrete-Filled Steel Tube Columns with Multiple Chambers and Round-Ended Cross-Sections under Axial Loading

Behavior of Concrete-Filled Steel Tube Columns with Multiple Chambers and Round-Ended Cross-Sections under Axial Loading

Experimental study and numerical analysis on axial compression of round-ended concrete filled CFRP-aluminum tube columns

Experimental and numerical studies of axially loaded square concrete‐encased concrete‐filled large‐diameter steel tubular short columns

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