Finite-element modelling of concrete-filled steel tube columns wrapped with CFRP

Abdalla, Khairedin M.; Al-Rousan, Rajai Z.; Alhassan, Mohammad A.; Lagaros, Nikos D.

doi:10.1680/jstbu.19.00011

Cited by 20 publications

(7 citation statements)

References 15 publications

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“…It is worth mentioning that the SOLID65 element is distinguished for having the capabilities of cracking, crushing, and plastic deformation in three perpendicu-lar directions. However, in this experimental work, the SOLID65 element's capability of crushing failure has been overlooked because this type of failure was not noticed when the load was applied [23][24][25][26][27][28][29][30]. Hence, the simulated models' tensile strains depended only on ultimate failure and emerging of cracking [23][24][25][26][27][28][29][30].…”

Section: Modeling Methodologymentioning

confidence: 99%

“…However, in this experimental work, the SOLID65 element's capability of crushing failure has been overlooked because this type of failure was not noticed when the load was applied [23][24][25][26][27][28][29][30]. Hence, the simulated models' tensile strains depended only on ultimate failure and emerging of cracking [23][24][25][26][27][28][29][30]. The used Poisson's ratio for concrete ranges from 0.15 to 0.22 thus a representative value of 0.2 was selected [34].…”

Section: Modeling Methodologymentioning

confidence: 99%

“…Few in-depth studies have adopted the NLFEA method to numerically model structural elements that are exposed to seismic loadings [23][24][25][26][27][28][29][30] and to simulate the behavior of the structural elements that are reinforced/rehabilitated with FRP. The reason behind this limitation of such studies is that modeling concrete's shear cracking is rather difficult, especially in the region of confinement and bonding.…”

Section: Introductionmentioning

confidence: 99%

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NLFEA of Sulfate-Damaged Circular CFT Steel Columns Confined with CFRP Composites and Subjected to Axial and Cyclic Lateral Loads

et al. 2022

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It is rather costly and difficult to experimentally evaluate the performance of concrete-filled tubular (CFT) circular steel columns exposed to combined axial and cyclic lateral loads. This research paper uses the nonlinear finite element (NLFEA) technique to assess the influence of using carbon-fiber-reinforced polymer (CFRP) laminates on the structural response and failure mode of damaged-by-sulfate CFT circular steel columns. At the beginning, twenty-one CFT circular steel column models were devised and checked for soundness using the findings of previously conducted research. Next, the models were broadened to investigate how the models’ behavior was influenced by the CFRP number of layers and the level of sulfate damage. For experimental purposes, the numbers of CFRP layers were set to be zero, five, six, seven, eight, nine, and ten, while there were three levels of sulfate damage, namely: level 0 (undamaged), level 1 (73 days), and level 2 (123 days). Some of the models were left unconfined with CFRP wraps for comparison. The CFRP confinement was at the end of the models due to its importance regarding the models’ capacity of lateral load. The columns’ ends were confined to prevent the models from outward local buckling, which led to higher strength, bigger net drift, and enhanced energy dissipation. The NLFEA models were then appropriately modified and adjusted in accordance with credible previously conducted experimental research; after which, a parametric study was performed to investigate how the models’ behavior was affected by the number of CFRP layers and the level of axial load. The study found that the CFT circular steel column models’ performance significantly enhanced when the models were wrapped with five to ten CFRP layers. It must be mentioned, though, that using eight, nine, and ten CFRP layers gave almost similar results. In addition, the NLFEA results revealed that when the damaged-by-sulfate models were repaired externally with CFRP wraps, there was an improvement in the models’ cyclic behavior, as they showed a raise in the load capacity, an enhancement in the horizontal displacement, a greater displacement ductility, better energy dissipation, and little deterioration in secant stiffness. The study found that using wraps of CFRP proved a great efficiency with the change in the sulfate damage level.

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Section: Modeling Methodologymentioning

confidence: 99%

Section: Modeling Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NLFEA of Sulfate-Damaged Circular CFT Steel Columns Confined with CFRP Composites and Subjected to Axial and Cyclic Lateral Loads

et al. 2022

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“…2 (AN-SYS 2009). With the assumption of the cleanness of the steel and sufficient adhesion of the core concrete to the steel (perfect bond with no slip assumption), the coincident nodes of the steel and the core concrete can be connected to each other by merging (Abdalla et al 2020). In this research, no contact element was used and assumed a perfect bond by merging the coincide nodes of steel and core concrete.…”

Section: Finite Element Modeling Of Concretefilled Steel Columnsmentioning

confidence: 99%

Investigation into the Behavior of Upgraded Concrete-filled Tubular Columns

Barghlame

Ferdousi

Ghasemi

2022

ACT

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Many advantages of concrete-filled steel tube columns have led to their use in a variety of distinctive and important structures in recent years, including high-rise buildings, piers, stairs and other structures. The exterior steel wall of these columns is uncoated, which is the main disadvantage. When these columns are subjected to external pressure on the external steel wall, such as collision, explosion, fire or other accidents, the confinement of concrete will be lost owing to the weakness generated in the steel wall, resulting in an abrupt loss in column strength. In this study, a new upgraded section using internal steel mesh is designed and introduced, with this steel mesh and the external steel wall acting as a double-skin steel tube to protect the concrete core from being destroyed if the external steel wall is destroyed and the column's strength drops suddenly. Under axial and cyclic loads, a comparison of the behavior of this innovative section (with internal steel mesh) with the most commonly used sections of concrete-filled steel columns was conducted. Following the verification of the finite element modeling, various other studies were carried out. The results of the analyses clearly show that the suggested CFT section has increased strength, improved resistance to progressive collapse, and energy absorption capacity under axial and cyclic loading, particularly abrupt loads such as fire or explosion, and thus its use in construction is recommended.

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“…Ozbakkaloglu et al (2013) developed the axial stress-strain behavior of FRP-confined concrete in circular sections, and the database containing the test results of 730 FRP-confined concrete cylinders under monotonic axial compression. Abdalla et al (2019) carried out a non-linear finite element analysis on circular concrete-filled steel tubes whose end regions were confined by CFRP, and research results showed that the use of CFRP composites resulted in an increase in the lateral load, drift capacities and energy dissipation. In review of the previous studies, it is found that the axial compress behavior of FRP confined concrete is the most important topic of the concrete-filled FRP tubular columns (Issa et al, 2009;Al-Rousan and Issa, 2018).…”

Section: Introductionmentioning

confidence: 99%

Behavior of Magnetically-Driven Concrete (MDC) Filled Double-Skin GFRP Tubes (CFDGT) Under Axial Compression

Xie

Chen

Wang

et al. 2022

Front. Built Environ.

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In order to study the axial compression behavior of magnetically-driven concrete (MDC) filled double-skin GFRP tubes (CFDGT), the axial compression test was conducted on eight columns (the length of columns ranged from 1,000 mm to 3,000 mm). For the MDC, a magnetic vibration device was established to vibrate the MDC, and two series of MDC (concrete with and without vibration) were adopted to investigate the vibration effect, research results showed that the concrete between two circular GFRP tubes could be effectively vibrated by the magnetic force. For the CFDGT columns with MDC, the load-displacement curves, load-strain curves, failure modes and ultimate loads of tested columns were obtained. After the axial compression test, a finite element model was proposed to predict the axial compression behavior and carry out parametric analysis. The design equations for the ultimate load of CFDGTs were derived from the finite element results, comparison results showed that the design equations can predict the ultimate load of CFDGT columns accurately and conservatively, and the maximum calculation error was controlled within 10%.

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Finite-element modelling of concrete-filled steel tube columns wrapped with CFRP

Cited by 20 publications

References 15 publications

NLFEA of Sulfate-Damaged Circular CFT Steel Columns Confined with CFRP Composites and Subjected to Axial and Cyclic Lateral Loads

NLFEA of Sulfate-Damaged Circular CFT Steel Columns Confined with CFRP Composites and Subjected to Axial and Cyclic Lateral Loads

Investigation into the Behavior of Upgraded Concrete-filled Tubular Columns

Behavior of Magnetically-Driven Concrete (MDC) Filled Double-Skin GFRP Tubes (CFDGT) Under Axial Compression

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