Performance Comparison of High Strength Reinforced Concrete Circular and Square Columns Subjected to Flexural Controlled Cyclic Loading

Ahmed, Ali; Mohammed, Ahmed Mohammed Youssef; Maekawa, Koichi

doi:10.28991/cej-2021-03091639

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Every structural member holds its own significance, and among them, columns require special attention. Columns primarily undergo axial forces in compression, but depending on the boundary conditions and nature of actions, they also experience bending, shear, and interaction between them [2]. Reinforced concrete members play a crucial role in resisting the collapse of superstructures, necessitating further investigation into their fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of Concrete Columns under Axial Load Based on European Design Norms

Grajçevci,

Mujaj,

Kryeziu

et al. 2024

Civ Eng J

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This study presents a comparison between numerical and experimental results for reinforced concrete columns subjected to axial compression. Depending on the columns support and their organization within the structure, columns primarily work under either concentric or eccentric compression, respectively, bending in situations where horizontal actions such as wind or/and earthquakes are present in the structure. Different countries have specific design codes, and in this study, the calculation of columns is based on the European design codes, specifically EN 1992-1-1. As a common practice in most cases during research, tests are conducted using computational models, and based on the obtained results through the application of similarity theory, an attempt is made to transition to the actual behavior of structural elements. Therefore, this paper applies a logic of "almost real" testing, where two columns with square cross-sections were produced and tested. The columns had a rectangular base with cross-section dimensions of 20/20 cm and a height (L) of 300 cm, with a concrete strength of fcm,cube=61.80 MPa. They were reinforced with longitudinal reinforcement (4Ø12 mm) and had a tensile strength of ftm=588.10 MPa. Additionally, stirrups of Ø8 mm were placed at every sw=25 cm. Experimental results show a closer alignment with software calculations using SEISMOSOFT with an accuracy of 96%, while results according to EN 1992-1-1, based on simplified methods, show 64% for the Nominal Stiffness Method and 59% for the Curvature Method. Doi: 10.28991/CEJ-2024-010-02-05 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of Concrete Columns under Axial Load Based on European Design Norms

Grajçevci,

Mujaj,

Kryeziu

et al. 2024

Civ Eng J

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“…al. [27]. The information of the framework to quantify the absolute permeability of water in a porous structure can be found in literature [28].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on Strengthened Reinforced Concrete Columns under Monotonic Axial Loading

Sirimontreea

Keawsawasvong

Thongchom

et al. 2021

IJE

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Strengthening of the existing reinforced concrete (RC) column is nessesary to enhance their axial loadcarrying capacity or ductility. This paper presents the results of an experimental study relating to the performance of reinforced concrete columns strengthened with different techniques such as the steel angle, steel straps, and ferro-cement under pure axial load. A total of six square short reinforced concrete columns were constructed. The cross-section and height of tested columns are 150×150 mm and 1.2 m, respectively. Two specimens were set as the control columns (without strengthening). The other four reinforced concrete columns were strengthened with different techniques. Two columns are strengthened with four steel angles at each corner of the column confined with prestressed steel straps. Another two columns are also strengthened with four steel angles confined with prestressed steel straps and ferrocement. The experimental results are reported in terms of the load-deformation curves as well as the failure modes. A significant enhancement of the maximum axial load-carrying capacity and the ductility is observed for the strengthened reinforced concrete columns. Finally, the discussion of the use of different strengthening techniques is also carried out in this paper.

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Experimental study on the behavior of small-scaled circular and square RC columns under various loading conditions and corrosion effect

Elshafei,

Abdalla,

Youssef

2024

J. Eng. Appl. Sci.

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Reinforced concrete columns are vital load-bearing elements, responsible for transferring vertical loads and resisting lateral forces. While numerous factors govern column performance, this study pinpoints cross-sectional shape, transverse reinforcement configuration, and the corrosive threat as its primary areas of investigation. Thus, 20 small-scaled (1/8th scale) RC columns (square and circular, with ties or spirals) were tested under various loading conditions. Columns were divided into five groups. A preliminary test was conducted to determine individual axial load capacity through failure under axial compressive loading. The main test then explored their behavior under combined axial load and variable lateral drift compared to their behavior at two corrosion levels 15% and 25%. While corrosion levels were roughly achieved, uneven distribution due to the accelerated process concentrated pitting near construction joints, impacting reinforcement more than rebar. Results confirmed the efficacy of spirals in enhancing capacity, particularly for circular columns where they also increased lateral load capacity. However, spirals also amplified corrosion vulnerability in circular columns, suggesting a steeper decline in performance at higher corrosion levels. Two key models were derived from analyzing the recorded data: normalized total dissipated energy and normalized absolute peak load. Future research should prioritize exploring column behavior under a wider range of combined loads and corrosion levels to refine and validate these models.

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Performance Comparison of High Strength Reinforced Concrete Circular and Square Columns Subjected to Flexural Controlled Cyclic Loading

Cited by 3 publications

References 16 publications

Experimental and Numerical Analysis of Concrete Columns under Axial Load Based on European Design Norms

Experimental and Numerical Analysis of Concrete Columns under Axial Load Based on European Design Norms

Experimental Investigations on Strengthened Reinforced Concrete Columns under Monotonic Axial Loading

Experimental study on the behavior of small-scaled circular and square RC columns under various loading conditions and corrosion effect

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