Behavior of steel tube columns filled with steel-fiber-reinforced self-stressing recycled aggregate concrete under axial compression

A comprehensive study of the shear characteristics of steel fiber reinforced recycled concrete-filled steel tube (SRCFST) columns is conducted. 50 CFST stub columns are tested with the variables of steel tube diameter-thickness ratio ( D/t), shear span-to-depth ratio (λ), axial compression ratio ( n), and concrete mix. Two types of cements, three recycled aggregate percentages, three water-cement ratios, and three steel fiber contents are considered in design of concrete mixes. The experimental results show that SRCFST columns present the coincident shear behavior of the ordinary CFST columns. As λ is increased, shear resistance shows a downtrend, while the flexural strength presents an increasing trend. Imposing axial compression or thickening steel tube contributes to an adequate safety margin in plastic period. Based on the contributions superposition method, a predicted model of the shear capacity of SRCFST columns is proposed in consideration of shear-span ratio, axial compression, and self-stress.

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Compressive stress–strain behavior of steel fiber reinforced-recycled aggregate concrete

Cement and Concrete Composites ◽

10.1016/j.cemconcomp.2013.11.006 ◽

2014 ◽

Vol 46 ◽

pp. 65-72 ◽

Cited By ~ 105

Author(s):

Jodilson Amorim Carneiro ◽

Paulo Roberto Lopes Lima ◽

Mônica Batista Leite ◽

Romildo Dias Toledo Filho

Keyword(s):

Compressive Stress ◽

Steel Fiber ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Fiber Reinforced ◽

Stress Strain ◽

Aggregate Concrete ◽

Strain Behavior

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Mechanical properties of steel fiber reinforced recycled aggregate concrete

Structural Concrete ◽

10.1002/suco.201800156 ◽

2018 ◽

Vol 20 (2) ◽

pp. 745-755 ◽

Cited By ~ 5

Author(s):

Rakul Bharatwaj Ramesh ◽

Olivia Mirza ◽

Won‐Hee Kang

Keyword(s):

Mechanical Properties ◽

Steel Fiber ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Fiber Reinforced ◽

Aggregate Concrete

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Axial behavior of carbon fiber-reinforced polymer–confined recycled aggregate concrete-filled steel tube slender square columns

Advances in Structural Engineering ◽

10.1177/13694332211033964 ◽

2021 ◽

pp. 136943322110339

Author(s):

Jiongfeng Liang ◽

Siqi Lin ◽

Mizan Ahmed

Keyword(s):

Steel Tube ◽

Recycled Aggregate Concrete ◽

Fiber Reinforced Polymer ◽

Recycled Aggregate ◽

Fiber Reinforced ◽

Replacement Ratio ◽

Aggregate Concrete ◽

Concrete Filled Steel Tube ◽

Reinforced Polymer ◽

Axial Behavior

The behavior of fiber-reinforced polymer (FRP)–confined recycled aggregate concrete-filled steel tube (RACFT) columns is barely studied. Especially, that of slender specimens has not been investigated so far. In this article, an experimental test of FRP-confined RACFT slender square columns was conducted to study the influences of recycled aggregate (RA) replacement ratios, FRP thicknesses, and wrapping schemes on their axial behavior. Results in this article suggest that the RA replacement ratio barely affects the initial stiffness of load-deflection curves of specimens. Moreover, the specimen with a higher RA replacement ratio has a lower axial stress but larger strain at the peak point. The external FRP jackets (either partial or full wrap) can effectively improve the performance of axially loaded RACFT columns, and the improvement of ductility due to the increase of the FRP thickness is more significant than that of axial compressive strength. Additionally, it was found that the axial strength and ultimate axial strain decrease with increasing slenderness ratios. Furthermore, the influences of slenderness ratios on the behavior of such columns are more significant for the column with a larger length-to-width ratio. Finally, a design model for FRP-confined RACFT slender square columns is developed, which can predict the results of the present test accurately.

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Flexural fatigue characteristics of steel fiber reinforced recycled aggregate concrete (SFRRAC)

Facta universitatis - series Architecture and Civil Engineering ◽

10.2298/fuace0901019h ◽

2009 ◽

Vol 7 (1) ◽

pp. 19-33 ◽

Cited By ~ 13

Author(s):

M. Heeralal ◽

Rathish Kumar ◽

Y.V. Rao

Keyword(s):

Steel Fiber ◽

Research Work ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Recycled Aggregates ◽

Fiber Reinforced ◽

Aggregate Concrete ◽

Flexural Fatigue ◽

Rigid Pavements ◽

Structural Applications

This research work is aimed at investigating the flexural fatigue behavior of Steel Fiber Reinforced Recycled Aggregate Concrete (SFRRAC). This study gains importance in view of the wide potential for demolished concrete to serve as a source of quality aggregate feed stock in a variety of structural and non-structural applications. This is a continuation of a series of investigations being conducted aimed at optimizing the utilization of recycled aggregate concrete in rigid pavements. A total of 72 standard flexure specimens of 100mm x 100mm x 450mm were cast and tested for flexure under both static and fatigue loading. The parameters of the investigation included the different replacements of recycled aggregate in natural aggregate, presence of steel fiber and different stress levels. The study showed that the recycled aggregates can be used in rigid pavements also and the inclusion of fibers can benefit the fatigue performance of recycled aggregate concrete.

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