Effect of stirrups densification on ultimate capacity of rectangular reinforced concrete columns

Abd-Elhamed, M. K.; Owida, M.E.

doi:10.1016/j.istruc.2019.06.016

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…According to previous research, the analysis of in ll walls subjected to in-plane loads is done by considering them as diagonal struts [2].…”

Section: Effect Of In Ll Wallmentioning

confidence: 99%

“…So it is clear that the seismic behavior of the structure can only be obtained by considering the in uence of the in ll wall which leads to safe design. In most cases, the in ll wall is not considered a structural member, but from the literature, it is clear that the lateral stiffness of the in ll wall in uences the seismic behavior of the building [2]. In practically all seismic codes, however, in ll walls are always handled as single loads, and as a result, the rigidity effect is overlooked.…”

Section: Introductionmentioning

confidence: 99%

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Fundamental Period Prediction of Infill Reinforced Concrete Structures using an Ensemble of Regressors

Vijayan,

Joy,

Shailesh

2023

Preprint

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The fundamental period places an important role when a structure is designed for seismic load. Infill walls are non-load-bearing walls created mostly from masonry, concrete, and other heavy materials, filled in the primary structural frame for a proper structural cladding system. As a result, this infill wall will increase the stiffness of the structure, thereby fundamental time period is significantly changed. Most of the studies on the fundamental period are not giving much importance to the infill walls even though it is crucial to be analyzed. In this work, we propose an automated and efficient analysis method for predicting the fundamental period of infill Reinforced Concrete frames using machine learning techniques. As the nature of dependency of different independent variables considered in this study is unknown, different regression techniques were chosen for this purpose. So we rely upon an exceptional machine learning technique called ensemble learning, which combines predictions from different models to deduce the final prediction more accurately. The storey numbers, number of spans, length of span, stiffness of infill wall, and percentage of openings are set as input factors, while the value of the fundamental time period is chosen as an output. The proposed regression model's correctness is verified by comparing it to existing formulae in the literature. As a result, in comparison to statistical models, the linear regression model shows an r2 value of 0.98921 and has better ability, flexibility, and accuracy.

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“…According to previous research, the analysis of in ll walls subjected to in-plane loads is done by considering them as diagonal struts [2].…”

Section: Effect Of In Ll Wallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fundamental Period Prediction of Infill Reinforced Concrete Structures using an Ensemble of Regressors

Vijayan,

Joy,

Shailesh

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The Young's modulus for reinforcement was taken 2.0 x 105 (N/mm2) and Poisson's ratio was taken to be (0.3). The idealized stress-strain curve for the internal vertical and horizontal reinforcement was used in the finite element model as shown in Figure [12].…”

Section: Defining Of Internal Steel Reinforcementmentioning

confidence: 99%

“…Abd-Elhamed and M.E. Owida (2019) [12] studied the effect of stirrups densification at top and bottom of columns and along of height of columns on ultimate load capacity. The results showed that the failure load increases by increasing the percentage of stirrups densification height at top and bottom of column / total column height.…”

Section: Introductionmentioning

confidence: 99%

Combined Effect of Stirrup Volumetric Ratio With Vertical Steel Bars on the Behavior of R.C. Columns Under Axial Loads

Abd-Elhamed

2020

Journal of Al-Azhar University Engineering Sector

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Most international codes in the design of R.C. columns use only the vertical steel bar effect in determining ultimate load capacity. No combination effect of stirrup volumetric ratio with vertical steel bar has been taken in design of the R.C. column. The present study deals with an experimental and analytical analysis of the behavior of reinforced concrete columns with different percentage of vertical steel bars (µ) and stirrups volumetric ratio (ρ v). A total of sixteen R.C. columns with cross-section (250x250x1000) mm were tested and divided into four groups and tested until failure under axial load. Group 1 consisted of four columns with vertical steel bars with (µ) = 0.18% and stirrups (ρ v) = (0.27%, 0.48%, 0.75 and 1.09%). Group 2, 3 and 4 having same stirrups (ρ v) % with vertical bars (µ) = (0.32%, 0.50%, 0.75%) respectively. The test results showed that increasing in the percentage of vertical steel bars (µ) = (0.18% up to 0.73%) give an increase of the ultimate failure load up to 9.7%. Also, increasing percentage of stirrups volumetric ratio (ρ v) = (0.27% up to 1.09 %) gives an increase of the ultimate failure load up to 12.3% and enhancement in ductility of columns Thus, the increase in the ultimate load of columns due to stirrups effect should be taken into consideration in the design of R.C columns. The analytical analysis (FEA) models can be simulate the experimental behavior of tested columns and can be suitable to reduce time and cost.

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“…Their main goal was to analyze the effect of load eccentricity. Besides the dimensions of the cross-section, material properties, static schemes, and the longitudinal reinforcement area, the area of transverse reinforcement (stirrups) also has a significant effect on the load-bearing capacity of columns [12,13]. During the design of reinforced concrete members, the approach to problem-solving is crucial, especially the selection of calculation methods.…”

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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Effect of stirrups densification on ultimate capacity of rectangular reinforced concrete columns

Cited by 7 publications

References 6 publications

Fundamental Period Prediction of Infill Reinforced Concrete Structures using an Ensemble of Regressors

Fundamental Period Prediction of Infill Reinforced Concrete Structures using an Ensemble of Regressors

Combined Effect of Stirrup Volumetric Ratio With Vertical Steel Bars on the Behavior of R.C. Columns Under Axial Loads

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

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