Modeling of the Axial Load Capacity of RC Columns Strengthened with Steel Jacketing under Preloading Based on FE Simulation

Sayed, Ahmed M.; Diab, Hesham

doi:10.1155/2019/8653247

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…The present study aimed to investigate the behaviour of equal and unequal single-angle steel members using finite element (FE) simulations and analysis, which are currently widely used to analyze steel structural elements and have been shown to give highly accurate results [20][21][22]. The single angles are connected through one leg by welding connections under different end deformations, where the deformation is controlled in the two directions perpendicular to the load axis.…”

Section: Figure 1 Distribution Of Stresses On a Steel Single-angle Sectionmentioning

confidence: 99%

“…The engineering stress-strain relationship and elastic modulus of the steel elements, which are measured experimentally by tension tests, are acquired from a previously published work [7]. The average engineering stress-strain relationship of the tension test results [7] is applied to FE modeling, as shown in Table 1, with elastic modulus is set to 203 GPa, and a Poisson's ratio of 0.3 is applied [20][21][22]. The model is divided into small elements with l×w×h of 10 ×5 ×5 mm as a maximum size.…”

Section: Steel Modelling and Characteristicsmentioning

confidence: 99%

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Numerical Analysis of Single-Angle Steel Member Under Tension Force with Different End Deformations

Sayed

2020

Civ Eng J

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Steel members with a single-angle cross-section are widely used, but some of their behaviours under loads are not considered by design codes, necessitating related research. This study is carried out on fifty steel single-angle members focused on the stress distribution behaviour and the ultimate axial load capacities under different end deformations through 3-dimensional Finite Element (FE) simulations and comparison with previous experimental findings. FE modeling is capable of modeling steel structures with high accuracy. Based on the results, the length of the angle affects neither the shape of the stress distribution nor the ultimate load capacity of the element. The end deformations affect the stress distribution on the member angle cross-section, including the ultimate load capacity. The end deformations which restricted deformations in the two directions perpendicular to the load axis are found to be optimal, with an average increase in load capacity by a factor of 1.96 for an equal angle and 2.21 for an unequal angle compared with the capacities calculated for single angles with deformations allowed in all directions. The appearance of a compression zone on the unconnected angle leg reduces the ultimate load capacity. The current design code (ANSI/AISC-360) can be adopted to calculate the ultimate load in the case of no deformation in the y-axis direction and no deformations in the x- and y-axis directions where the mean ratios of PNum/Pcode are 1.24 and 1.34 respectively. However, the code does not agree with the end deformations of free deformations and no deformation in the x-axis direction for either equal or unequal angles where the mean ratios of PNum/Pcode are 0.64 and 0.79 respectively, which is unsafe.

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Section: Figure 1 Distribution Of Stresses On a Steel Single-angle Sectionmentioning

confidence: 99%

Section: Steel Modelling and Characteristicsmentioning

confidence: 99%

Numerical Analysis of Single-Angle Steel Member Under Tension Force with Different End Deformations

Sayed

2020

Civ Eng J

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“…The steel sheets integrated into the FE numerical simulation models were expected to have linear elasticity. The elastic modulus and the stress-strain engineering relationships that depend upon the experimental test specimens which were done in this research and the Poisson ratio of 0.3 was applied [14,15]. The maximum size of the meshing elements was taken as being 1 mm in length, 1 mm in width, and 1 mm in height.…”

Section: Experimental Test Specimensmentioning

confidence: 99%

“…Nowadays, finite-element FE modeling and simulation techniques are widely used in research involving structural analysis and design, especially of structural steel elements [14,15]. In some research, FE modeling techniques are often used to expand the limitations of the experimental testing analysis, because of the difficulty of implementation or high cost, and are also used to investigate the different parameters which that affect the problem study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Perforated Steel Sheets Under Uni-Axial Tensile Force

Sayed

2019

Metals

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The perforated steel sheets have many uses, so they should be studied under the influence of the uniaxial tensile load. The presence of these holes in the steel sheets certainly affects the mechanical properties. This paper aims at studying the behavior of the stress-strain engineering relationships of the perforated steel sheets. To achieve this, the three-dimensional finite element (FE) model is mainly designed to investigate the effect of this condition. Experimental tests were carried out on solid specimens to be used in the test of model accuracy of the FE simulation. Simulation testing shows that the FE modeling revealed the ability to calculate the stress-strain engineering relationships of perforated steel sheets. It can be concluded that the effect of a perforated rhombus shape is greater than the others, and perforated square shape has no effect on the stress-strain engineering relationships. The efficiency of the perforated staggered or linearly distribution shapes with the actual net area on the applied loads has the opposite effect, as it reduces the load capacity for all types of perforated shapes. Despite the decrease in load capacity, it improves the properties of the steel sheets.

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“…The review was structured according to the method of strengthening, and indicated that none of these studies considered the effect of the presence of a preload or pre-cracks in the RC columns on the strengthening process. Some numerical studies considered the effect of preloading on strengthening with steel angle jacketing [40][41][42], and demonstrated that preloading greatly impacts the efficiency of the strengthening of RC columns according to the preload on the column. Therefore, in this study, RC columns were strengthened with RC jacketing after cracks formed on the sides of the columns, to determine their effect on the efficiency of strengthening.…”

Section: Introductionmentioning

confidence: 99%

Experimental Behavior of Cracked Reinforced Concrete Columns Strengthened with Reinforced Concrete Jacketing

2020

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Reinforced concrete (RC) columns often need to be strengthened or rehabilitated to allow them to carry the loads applied to them. In previous studies, RC columns have been strengthened by jacketing, without considering the occurrence of cracking. In this study, the behavior of RC columns strengthened externally by jacketing after cracking is analyzed. The accuracy of the existing models was verified by analyzing the performance of fifteen RC columns with different cross-sections to determine the effect of new variables, such as the column size, amount of steel reinforcement, and whether the column was cracked or not, on the effectiveness of strengthening. The analysis demonstrated that this strengthening technique could effectively improve both the ductility and strength of RC column cross-sections. The results indicate that the model suggested by the ACI-318 code can predict the ultimate load capacity of RC columns without strengthening, or strengthened by RC jacketing before or after cracking, with higher accuracy and material efficiency. The RC columns without strengthening met the safety limit of the ACI-318 model. However, for strengthened columns, a reduction coefficient must be used to enable the columns to meet the safety limit, with values of 94% and 76% for columns strengthened before and after cracking, respectively. Furthermore, strengthening after cracking affects the ultimate load capacity of the column, with 15.7%, 14.1%, and 13.5% lower loads for square, rectangular, and circular columns than those strengthened before cracking, respectively.

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Modeling of the Axial Load Capacity of RC Columns Strengthened with Steel Jacketing under Preloading Based on FE Simulation

Cited by 6 publications

References 12 publications

Numerical Analysis of Single-Angle Steel Member Under Tension Force with Different End Deformations

Numerical Analysis of Single-Angle Steel Member Under Tension Force with Different End Deformations

Numerical Analysis of the Perforated Steel Sheets Under Uni-Axial Tensile Force

Experimental Behavior of Cracked Reinforced Concrete Columns Strengthened with Reinforced Concrete Jacketing

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