Nonlinear analysis of axially loaded circular concrete-filled stainless steel tubular short columns

Patel, Vipulkumar Ishvarbhai; Liang, Qing Quan; Hadi, Muhammad N.S.

doi:10.1016/j.jcsr.2014.04.036

Cited by 90 publications

(44 citation statements)

References 29 publications

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“…There are two options to model the interaction between the U-shaped steel and the in-filled concrete. First, the bond between the steel and concrete is considered perfect and no slip occurs, which was employed in past research [33][34][35]. Second, the interaction between the steel and concrete is simulated by using spring elements and contact elements [36,37].…”

Section: Finite-element Modelsmentioning

confidence: 99%

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

2018

Applied Sciences

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Abstract:To reuse waste concrete in a more straightforward and simplified way, a new kind of structural member containing fresh concrete (FC) and demolished concrete lumps (DCLs) distinctly larger than conventional recycled aggregates has been proposed. Previous research has shown that, at room temperature, the mechanical performance of the U-shaped steel beams filled with DCLs and FC is similar to that of the U-shaped steel beams filled with FC alone. This research explores the fire behavior of the U-shaped steel beams filled with DCLs and FC. Five specimens including three beams filled with DCLs and FC and two reference beams filled with FC alone were tested in fire. The experimental parameters included the replacement ratio of DCLs, the longitudinal reinforcement ratio, the load ratio, and the thickness of fire insulation. Based on the test results, numerical models in which the thermal resistance at the interface between the U-shaped steel and the in-filled concrete is considered are developed using SAFIR to determine the thermal and structural responses of the specimens. Lastly, parametric studies are carried out preliminarily to investigate the effects of some parameters on the fire resistance of such beams. It is found that the replacement ratio of DCLs within a range of 0% to 33% has a very limited effect on the temperature distribution, structural response, and fire resistance of the specimens, that embedding longitudinal reinforcements can significantly increase the fire resistance of such beams, that the interface thermal resistance can generate a temperature drop of up to 280 • C at the interface between the U-shaped steel and the in-filled concrete, and that the numerical models are capable of predicting the thermal and structural responses of such beams.

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Section: Finite-element Modelsmentioning

confidence: 99%

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

2018

Applied Sciences

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“…Patel et al [46] reported that there are significant differences between assuming the same and different strain hardening characteristics in tension and compression of stainless steel materials. Their study indicated that the average ultimate axial load of CFSST short columns was underestimated by about 16.9% by using the model that assumes the same strainhardening behavior in tension and compression when compared to that computed by the model assuming different strain hardening characteristics in tension and compression.…”

Section: Stainless Steelsmentioning

confidence: 99%

“…Quach et al [44] reported that stainless steel has different strain hardening characteristics in compression and tension [45] and the two-stage stress-strain laws given by Rasmussen [43] were based on the tension coupon test results, which underestimates the ultimate compressive strength of stainless steels. Patel et al [46] incorporated the accurate three-stage stress-strain relations given by Quach et al [44] and Abdella et al [47] for stainless steels in the fiber element modeling of short circular CFSST columns. The numerical solutions obtained were shown to agree well with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear analysis of circular high strength concrete-filled stainless steel tubular slender beam-columns

Patel

Liang

Hadi

2017

Engineering Structures

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Nonlinear analysis of circular high strength concrete-filled stainless steel tubular slender beam-columns AbstractConcrete-filled stainless steel tubular (CFSST) slender columns are increasingly used in composite structures owing to their distinguished features, such as aesthetic appearance, high corrosion resistance, high durability and ease of maintenance. Currently, however, there is a lack of an accurate and efficient numerical model that can be utilized to determine the performance of circular CFSST slender columns. This paper describes a nonlinear fiber-based model proposed for computing the deflection and axial load-moment strength interaction responses of eccentrically loaded circular high-strength CFSST slender columns. The fiber-based model incorporates the accurate three-stage stress-strain relations of stainless steels, accounting for different strain hardening characteristics in tension and compression. The material and geometric nonlinearities as well as concrete confinement are included in the computational procedures. Existing experimental results on axially loaded CFSST slender columns are utilized to verify the proposed fiber-based model. A parametric study is conducted to examine the performance of high-strength slender CFSST beam-columns with various geometric and material parameters. It is shown that the fiber-based analysis technique developed can accurately capture the experimentally observed performance of circular high-strength CFSST slender columns. The results obtained indicate that increasing the eccentricity ratio, column slenderness ratio and diameter-to-thickness ratio remarkably decreases the initial flexural stiffness and ultimate axial strength of CFSST columns, but considerably increases their displacement ductility. Moreover, an increase in concrete compressive strength increases the flexural stiffness and ultimate axial strength of CFSST columns; however, it decreases their ductility. Furthermore, the ultimate axial strength of CFST slender columns is found to increase by using stainless steel tubes with higher proof stresses. decreases their ductility. Furthermore, the ultimate axial strength of CFST slender columns is found to increase by using stainless steel tubes with higher proof stresses.

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“…[12] experimentally analysed the strength and ductility indices for dune sand CFST members. In 2014 Patel [13] experimentally analysed the axial compression behaviour of circular CFSST columns, which showed an ultimate compressive strength of stainless steel higher than its tensile strength and derived the fibre model based on the threestage stress-strain relationship of stainless steel. In the same year Tam [14] carried out the experimentation and finite element simulation of CFSST short columns with regard to their diameter-thickness ratios.…”

Section: Introductionmentioning

confidence: 99%

Structural state of stress analysis of concrete‐filled stainless steel tubular short columns

Shi

Chen

et al. 2018

Stahlbau

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Analyse der statischen Spannungszustände von kurzen betongefüllten Rundstützen aus Edelstahl. Unter Anwendung der Theorie der statischen Spannungszustände werden im vorliegenden Beitrag die experimentellen Untersuchungen zum Arbeitsverhalten kurzer betongefüllter Rundstützen aus Edelstahl (CFSST) behandelt. Zur Beschreibung des statischen Spannungszustands wird zunächst die Summe der GSED (Generalized Strain Energy Density)‐Werte (Eij) der Kurzstütze bei jedem Lastwert (Fj) als Ej,norm standardisiert. Anschließend wird der stark ansteigende Spannungszustand, unter Beachtung des Gesetzes von quantitativer Veränderung zu qualitativer Veränderung, durch Anwendung des Mann‐Kendall (M‐K)‐Kriteriums auf die Ej,norm‐Fj‐Kurve herausgearbeitet. Die Untersuchung zeigt die allgemeinen Charakteristiken der Veränderungen des Spannungszustandes von kurzen Stützen bei bestimmten Einzellasten, was die Präzisierung der Versagenslast ermöglicht. Darüber hinaus wird nachgewiesen, dass das simulative Arbeitsverhalten kurzer Stützen die Spannungszustände widerspiegeln kann, die sich aus den experimentellen Daten ergeben. Daher werden die Bedingungen der Versagenslasten von kurzen CFSST‐Stützen unter Verwendung der simulativen Daten formuliert und diese durch experimentelle und simulative Daten validiert. Insgesamt untersucht diese Studie eine neue Möglichkeit zur Erkennung unsichtbarer Arbeitseigenschaften von Tragwerken. Im Idealfall gibt sie Anlass zu entsprechenden Untersuchungen verschiedener Tragwerke, sodass die Ergebnisse zu einer Verbesserung der Bemessungsvorschrift führen können.

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Nonlinear analysis of axially loaded circular concrete-filled stainless steel tubular short columns

Cited by 90 publications

References 29 publications

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

Nonlinear analysis of circular high strength concrete-filled stainless steel tubular slender beam-columns

Structural state of stress analysis of concrete‐filled stainless steel tubular short columns

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