Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

Kim, Chang-Soo; Hwang, Hyeon‐Jong

doi:10.1186/s40069-018-0238-7

Cited by 22 publications

(5 citation statements)

References 40 publications

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“…Chang S. K. (2018) [20] performed nonlinear numerical analysis in order to investigate the load-carrying capacity of high-strength CES-A columns [corner steel angles were encased in the concrete]. The effects of strain compatibility, confinement effect of steel angles and transverse reinforcement, and local buckling of steel angles and longitudinal bar were considered in this study for numerical analysis.…”

Section: B Numerical Investigationsmentioning

confidence: 99%

Steel Angles and Strips Jacketing of Existing RC Columns: A State of Art

Farjana¹,

Habib²

2019

International Advanced Research Journal in Science, Engineering

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Steel angles and strips jacketing method is the popular structural local strengthening technique for existing deficient RC columns. Although this strengthening technique is well accepted, limited research is carried on the actual strength and behaviour enhancement of the deficient RC columns due to the application of this particular steel jacketing method. This study primarily intends to review the experimental and numerical works on the steel angles and strips jacketing method used for deficient RC columns available in published literature. This study also intends to present the variables which have considerable influence on the strength and behaviour enhancement of the deficient RC columns for this structural local strengthening technique.

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Section: B Numerical Investigationsmentioning

confidence: 99%

Steel Angles and Strips Jacketing of Existing RC Columns: A State of Art

Farjana¹,

Habib²

2019

International Advanced Research Journal in Science, Engineering

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“…When employing steel angles, they observed that the percentage of increased strength reached 20% and the deflection decreased to 2.38 times. In a study by Hwang (2018), Five square column specimens with a cross section of 500x500 mm and steel ratio of 2% with different steel cross section (steel angle and IPE) were tested, allowing for the comparison of a prefabricated steelreinforced concrete (PSRC) composite column using steel angles and a conventional concrete-encased steel (CES) composite column. They observed that the axial load capacity, deformation capacity, and corner angles of the PSRC column are more precise than those of the CES columns, and that the PSRC column's flexural strength and stiffness can rise by up to 30% in comparison.…”

Section: Introductionmentioning

confidence: 99%

“…They observed that the axial load capacity, deformation capacity, and corner angles of the PSRC column are more precise than those of the CES columns, and that the PSRC column's flexural strength and stiffness can rise by up to 30% in comparison. The effects of confinement effect, local buckling, and premature cover-spalling were numerically discussed by Kim and Hwang (2018) for the results of previous experimental studies by testing a total of sixteen square column specimens under concentric and eccentric axial compression, with varying cross-sections (260 mm × 260 mm, 400 mm × 400 mm, and 500 mm × 500 mm) and heights of 1500 mm. They observed that the early spalling of concrete cover and the effect of local buckling of steel angles on confinement, which are the special local failure mechanisms of columns.…”

Section: Introductionmentioning

confidence: 99%

Slenderness Effect for The Composite RC Columns with Steel Angles at The Corners; Experimentally and Analytically

Abdellatif,

M. ayash,

H. Ali

et al. 2024

Engineering Research Journal

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The study focuses on the application of composite columns, utilizing four steel angles at the corners of the concrete column welded together with a transverse plate, and contrasting the experimental findings with those produced by structural analysis programs using ANSYS. Three square composite columns are included in the experimental test program under axial compression, and the primary variables are the longitudinal reinforcement ratio and steel angle thickness. Investigations are conducted into the axial and horizontal deformations, load capacity, failure mode, and axial and lateral strains of composite columns. In order to review the impact of the slenderness ratio on the behavior of composite columns for parametric study, more numerical models are utilized. The results indicate that there are two primary phases to the failure process. Localized buckling in the longitudinal reinforcement occurs in the second stage, after the concrete cover has been crushed or spalled in the first stage. The impact of steel angle thickness according to experimental results: axial strain, lateral strain, horizontal displacement, and axial displacement decrease with increasing steel angle thickness. The percentage of decrease for axial displacement is between 11% and 20%; for horizontal displacement, it is between 16% and 20%; for axial strain, it is between 4% and 10%; and for lateral strain, it is between 13% and 22%. But the load capacity increases with increasing steel angle thickness, the percentage of increase for load capacity is between 16% and 23%. The convergence rate between the analytical model and the experimental results ranged from 2% to 6% for load capacity, and 5% to 14% for axial displacement. This indicates that an analytical model that was created with the aid of the ANSYS software was able to accurately anticipate the failure load, axial deformation, and failure modes. From the C parametric results obtained analytically, it can reach that with the same reinforced angle thickness, a higher slenderness ratio resulted in greater axial distortion with no impact on load capacity. This warning is particularly noticeable for columns that have smaller reinforced angles as opposed to thicker ones. If there is no obvious buckling, the influence of the column height reduces as the column height and the steel angle thickness grow. In contrast to short columns, slender columns' load capacity can be increased by increasing the thickness of the reinforcing steel angle, which also results in a greater reduction in axial distortion. Energy absorption rises with increasing slenderness ratio for thinner reinforced angles but falls with increasing slenderness ratio for broader reinforced angles.

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“…Hwang et al 16 studied the axial compression performance of the built-in angle steel composite column and found that the axial bearing capacity and deformation capacity of the test column were good, and sufficient lateral constraints were formed on the concrete in the core area via the angle steel and welded stirrups. Kim et al 17 studied the bearing capacity of built-in angle steel and high-strength concrete column and found that when the contribution and restraint efficiency of steel were high, the built-in angle steel and high-strength concrete column was still equipped with a large bearing capacity after the protective layer was peeled off because the strength of concrete in the core area remained unchanged after the angle steel yielded. On the basis, the paper aims to achieve a higher ultimate bearing capacity, deformation performance and better ductility of composite hollow column of steel fiber, high-strength lightweight aggregate concrete and angle steel with the purpose of reducing the own weight of the structure and improving the performance of reinforced concrete hollow column via replacing the ordinary concrete with steel fiber and high-strength lightweight concrete, and substituting the longitudinal reinforcement and stirrup with angle steel and batten plate respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on axial compression for composite hollow column of steel fiber, high-strength lightweight aggregate concrete and angle steel

Xiang

Qiao

Niu

et al. 2022

Sci Rep

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In order to study the axial compression performance for composite hollow column of steel fiber, high-strength lightweight aggregate concrete and angle steel, the axial compression tests were carried out on five composite hollow columns of steel fiber, high-strength lightweight aggregate concrete and angle steel with the variation parameters of hollow ratio (0%, 15%, 16%, 32% and 36%) and the form of opening (round hole and square hole). The failure phenomena and failure forms of the specimens were observed, and their stress–strain curves were measured, and the axial bearing capacity formula suitable for composite hollow column of steel fiber, high-strength lightweight aggregate concrete and angle steel was established. The following conclusions may be obtained from the test results: the axial compression performance for the composite hollow columns of angle steel is influenced by the hollow ratio and opening form greatly. The axial compression performance for composite hollow columns of steel fiber, high-strength lightweight aggregate concrete and angle steel is almost close to that of composite solid columns when the hollow ratio is low; The higher the void ratio, the more the cracks at the surface of the concrete, some transverse cracks appear, the peak load decreases by about 5–38%, and the deformation ductility coefficient increases gradually; The deformation ductility coefficient of round-hole hollow column is lower than that of square-hole hollow column. Based on the test, the finite element software ABAQUS is used to simulate the SCAH column. The correctness of the model is verified via the comparison between the numerical simulation results and the test results. At the same time, the stress nephogram of concrete and steel at different stages and the stress nephogram at concrete restraint state are simulated. According to the finite element simulation results, Mander model is used to calculate the axial compression bearing capacity of composite hollow column of angle steel. The high calculation accuracy and suitable for popularization can be obtained.

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Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

Cited by 22 publications

References 40 publications

Steel Angles and Strips Jacketing of Existing RC Columns: A State of Art

Steel Angles and Strips Jacketing of Existing RC Columns: A State of Art

Slenderness Effect for The Composite RC Columns with Steel Angles at The Corners; Experimentally and Analytically

Experimental study on axial compression for composite hollow column of steel fiber, high-strength lightweight aggregate concrete and angle steel

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